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SECTION D:

ELECTRICAL SYSTEM:

--Ignition System: Ignition Switch, Keys, Pickup Coil, Ignition Coils, TCI-Igniter, Spark Plugs, Plug Caps, Diodes, and related hardware, etc.



IGNITION SYSTEM PARTS:

IGNITION MAIN SWITCH & KEYS:

is4) OEM and aftermarket IGNITION MAIN SWITCH can be a cause of hard-to-diagnose electrical gremlins. Our brand new OEM and aftermarket replacement switches come complete, ready-to-install, with electrical harness and connector and a matched set of 2 keys. NOTE: replacement keys will not look like the original keys, and the "key position" decal differs slightly in appearance from original.

For a interesting rendering of how your ignition switch actually operates, dig this:



For info on how to clean your original switch, please review this info:

http://xjbikes.com/forums/index.php?threads/34810

and this:

http://www.xj4ever.com/clean%20and%20lu ... switch.pdf


HCP447 OEM IGNITION MAIN SWITCH, with built-in steering lock mechanism. Fits all XJ550 models, 1984-85 FJ600, 1986-88 FZ600, 1992-93 XJ600 Seca II, all XJ650 models (except Turbo), all 1983 XJ750 Maxim and Midnight Maxim, XJ900RK, and 1978-79 XS1100 models, as well as all of the following models: 1979 RD400F, 1980-82 SR250, 1987 SRX250, 1978-81 XS400, 1980-82 XS400 SG/SH/SJ, 1982-83 XS400 RJ/RK, 1978-83 XS650 Specials, 1980-81 XS650 Standards, 1978-79 XS750 Specials, 1980-81 XS850 Specials, 1983 XV500, 1981-83 XV750, 1983 XV750MK Midnight Specials, 1981-82 XV920 RH/RJ, 1988-99 FZR600, 1987 FZ700, 1985-86 and 1988 FZ750, 1987-88 FZR750R, 1987-93 FZR1000, 1984-85 FJ1100, 1986-87 and 1989-93 FJ1200 models. Comes with two keys.
$ discontinued

HCP1546 Aftermarket IGNITION MAIN SWITCH, with built-in steering lock mechanism. Pretty much an exact reproduction of the original, includes the 3-wire harness with white connector. Fits all XJ550 models, 1984-85 FJ600, 1986-88 FZ600, 1992-93 XJ600 Seca II, all XJ650 models (except Turbo), all 1983 XJ750 Maxim and Midnight Maxim, XJ900RK, and 1978-79 XS1100 models, as well as all of the following models: 1979 RD400F, 1980-82 SR250, 1987 SRX250, 1978-81 XS400, 1980-82 XS400 SG/SH/SJ, 1982-83 XS400 RJ/RK, 1978-83 XS650 Specials, 1980-81 XS650 Standards, 1978-79 XS750 Specials, 1980-81 XS850 Specials, 1983 XV500, 1981-83 XV750, 1983 XV750MK Midnight Specials, 1981-82 XV920 RH/RJ, 1988-99 FZR600, 1987 FZ700, 1985-86 and 1988 FZ750, 1987-88 FZR750R, 1987-93 FZR1000, 1984-85 FJ1100, 1986-87 and 1989-93 FJ1200 models. Comes with two keys. NOTE: the key-position decal that comes with this switch is very close in appearance to original, but not exact. If you want the correct decal, order part HCP7281 from below.
$ 44.95

HCP1252 Aftermarket IGNITION MAIN SWITCH, with built-in steering lock mechanism. Pretty much an exact reproduction of the original, but has the added security feature of using round (rather than flat) keys, thus minimizing the change that anyone will ever pick the lock. Includes the 3-wire harness with white connector. Fits all XJ550 models, 1984-85 FJ600, 1986-88 FZ600, 1992-93 XJ600 Seca II, all XJ650 models (except Turbo), all 1983 XJ750 Maxim and Midnight Maxim, XJ900RK, and 1978-79 XS1100 models, as well as all of the following models: 1979 RD400F, 1980-82 SR250, 1987 SRX250, 1978-81 XS400, 1980-82 XS400 SG/SH/SJ, 1982-83 XS400 RJ/RK, 1978-83 XS650 Specials, 1980-81 XS650 Standards, 1978-79 XS750 Specials, 1980-81 XS850 Specials, 1983 XV500, 1981-83 XV750, 1983 XV750MK Midnight Specials, 1981-82 XV920 RH/RJ, 1988-99 FZR600, 1987 FZ700, 1985-86 and 1988 FZ750, 1987-88 FZR750R, 1987-93 FZR1000, 1984-85 FJ1100, 1986-87 and 1989-93 FJ1200 models. Comes with two keys. NOTE: the key-position decal that comes with this switch is very close in appearance to original, but not exact. If you want the correct decal, order part HCP7281 from below.
$ 44.95


HCP9116 Aftermarket IGNITION MAIN SWITCH, with built-in steering lock mechanism. Pretty much an exact reproduction of the original; however, this version of the switch only includes a single 4-wire harness with the connector. Some original models would have also used a separate 2-wire harness from the switch that would run to the battery fluid level sensor, and this harness is not present on this switch (so you will lose that feature on your dash warning system). Fits all of the following EUROPEAN (non-North American) models only: XJ650 models, all XJ750 models, all XJ900, and all 1980-81 XS1100 models. Comes with two keys.
$ 44.95



HCP18168 OEM rebuilt IGNITION MAIN SWITCH, with built-in steering lock mechanism. Has 2 individual wire harnesses leads with correct color wires and plastic end connectors. Fits all XJ650 Turbo models and XJ750-D models. This unit has a brand new lock cylinder and housing and a rebuilt steering lock mechanism. Comes with two keys. NOTE: a $ 50.00 core charge applies to this item, and a re-usable, same-model, complete main switch must be returned for the core charge to be refunded (key not required). This core charge will be refunded when an original core is returned.
$ 99.95 + $ 50.00 refundable core charge



HCP2914 OEM IGNITION MAIN SWITCH, with built-in steering lock mechanism. Has 2 individual wire harnesses leads with correct color wires and plastic end connectors. Fits 1982 XJ750 Maxim and all 1981-83 XJ750 Seca models. Comes with two keys. Brand new.
$ discontinued

HCP18093 OEM rebuilt IGNITION MAIN SWITCH, with built-in steering lock mechanism. Has 2 individual wire harnesses leads with correct color wires and plastic end connectors. Fits 1982 XJ750 Maxim and all 1981-83 XJ750 Seca models. This unit has a brand new lock cylinder and housing and a rebuilt steering lock mechanism. Comes with two keys. NOTE: a $ 50.00 core charge applies to this item, and a re-usable, same-model, complete main switch must be returned for the core charge to be refunded (key not required). This core charge will be refunded when an original core is returned.
$ 129.95 + $ 50.00 refundable core charge


HCP2916 OEM main IGNITION MAIN SWITCH, with built-in steering lock mechanism. Includes the 3-wire harness with white connector. Fits all 1985-86 XJ700 models, XJ750-X, 1984-87 XV700 Virago, and 1988-97 XV750 Virago models. Comes with two keys. Brand new.
$ discontinued

HCP18169 OEM rebuilt IGNITION MAIN SWITCH, with built-in steering lock mechanism. Has 3-wire harness with white plastic end connector. Fits all 1985-86 XJ700 models, XJ750-X, 1984-87 XV700 Virago, and 1988-97 XV750 Virago models. This unit has a brand new lock cylinder and housing and a rebuilt steering lock mechanism. Comes with two keys. NOTE: a $ 50.00 core charge applies to this item, and a re-usable, same-model, complete main switch must be returned for the core charge to be refunded (key not required). This core charge will be refunded when an original core is returned.
$ 199.95 + $ 50.00 refundable core charge





HCP2171 OEM ignition switch MOUNTING BOLT, 6-point hex head alloy steel fastener with a bright zinc-plated finish, fits all XJ550, 1984-85 FJ600, XJ650, XJ700, XJ750, all XJ900RK, RL, and N models, and all XS1100 models. Use 2 per switch. Each:
$ 2.95

HCP24067 Aftermarket ignition switch MOUNTING BOLT, 6-point hex head alloy steel fastener with a bright zinc-plated finish, fits all XJ550, 1984-85 FJ600, XJ650, XJ700, XJ750, all XJ900RK, RL, and N models, and all XS1100 models. Use 2 per switch. Each:
$ 1.25

HCP24077 Aftermarket ignition switch MOUNTING BOLT, 6-point hex head 18/8 stainless steel fastener with a bright finish, fits all XJ550, 1984-85 FJ600, XJ650, XJ700, XJ750, all XJ900RK, RL, and N models, and all XS1100 models. Use 2 per switch. Each:
$ 1.75

HCP24078 Aftermarket ignition switch MOUNTING BOLT, 6-point hex head 316 stainless steel fastener with a bright finish, fits all XJ550, 1984-85 FJ600, XJ650, XJ700, XJ750, all XJ900RK, RL, and N models, and all XS1100 models. Use 2 per switch. Each:
$ 1.95

HCP6639 Aftermarket ignition switch MOUNTING BOLT, socket head (hex-key drive) 18/8 stainless steel fastener with a bright finish, fits all XJ550, 1984-85 FJ600, XJ650, XJ700, XJ750, all XJ900RK, RL, and N models, and all XS1100 models. Use 2 per switch. Each:
$ 1.95

HCP24075 Aftermarket ignition switch MOUNTING BOLT, socket head (hex-key drive) 18/8 stainless steel fastener with a bright finish, fits all XJ550, 1984-85 FJ600, XJ650, XJ700, XJ750, all XJ900RK, RL, and N models, and all XS1100 models. Use 2 per switch. Each:
$ 2.25

HCP6640 Aftermarket ignition switch MOUNTING BOLT, socket head (hex-key drive) black oxide-coated alloy steel fastener. Fits all XJ550, 1984-85 FJ600, XJ650, XJ700, XJ750, all XJ900RK, RL, and N models, and all XS1100 models. Use 2 per switch. Each:
$ 1.95



HCP13724 OEM ignition switch MOUNTING BOLT, fits all XJ900 FN and F models. Use 2 per switch. Each:
$ 4.95



HCP2173 OEM ignition switch mounting bolt FLAT WASHER, fits all XJ550, FJ600, XJ650, XJ700, XJ750, and all XJ900RK, RL, and N models. Use 2 per switch, original bright finish, each:
$ 1.95

HCP6642 Aftermarket ignition switch mounting bolt FLAT WASHER, zinc-plated alloy steel with a natural finish, fits all XJ550, FJ600, XJ650, XJ700, XJ750, and all XJ900RK, RL, and N models. Use 2 per switch, each:
$ 0.95

HCP6643 Aftermarket ignition switch mounting bolt FLAT WASHER, 18-8 stainless steel with a natural finish, fits all XJ550, FJ600, XJ650, XJ700, XJ750, and all XJ900RK, RL, and N models. Use 2 per switch, each:
$ 1.25

HCP25756 Aftermarket ignition switch mounting bolt FLAT WASHER, 316 stainless steel with a natural finish, fits all XJ550, FJ600, XJ650, XJ700, XJ750, and all XJ900RK, RL, and N models. Use 2 per switch, each:
$ 1.95

HCP14285 Aftermarket ignition switch mounting bolt FLAT WASHER, black oxide-coated 18-8 stainless steel, fits all XJ550, FJ600, XJ650, XJ700, XJ750, and all XJ900RK, RL, and N models. Use 2 per switch, each:
$ 1.95

HCP14284 Aftermarket ignition switch mounting bolt FLAT WASHER, black oxide-coated hardened alloy steel, fits all XJ550, FJ600, XJ650, XJ700, XJ750, and all XJ900RK, RL, and N models. Use 2 per switch, each:
$ 1.95



HCP2181 OEM ignition switch bracket-to-steering crown bracket mounting BOLT, alloy steel with a satin finish (original was bright polished), hex-head bolt. For all XJ1100 models. Use 2 per bike. Each:
$ 1.95

HCP17123 Aftermarket ignition switch bracket-to-steering crown bracket mounting BOLT, 18/8 stainless steel with a bright finish, hex-head bolt. For all XJ1100 models. Use 2 per bike. Each:
$ 1.95

HCP22191 Aftermarket ignition switch bracket-to-steering crown bracket mounting BOLT, 316 stainless steel with a bright finish, hex-head bolt. For all XJ1100 models. Use 2 per bike. Each:
$2.25

HCP22189 Aftermarket ignition switch bracket-to-steering crown bracket mounting BOLT, alloy steel with a yellow zinc-plated finish, hex-head bolt. For all XJ1100 models. Use 2 per bike. Each:
$ 1.25

HCP17122 Aftermarket ignition switch bracket-to-steering crown bracket mounting BOLT, alloy steel with a black finish, hex-head bolt. For all XJ1100 models. Use 2 per bike. Each:
$ 1.50



HCP2185 OEM ignition switch bracket-to-steering crown bracket mounting bolt LOCK WASHER, correct bright finish. For all XJ1100 models. Use 2 per bike. Each:
$ 1.95

HCP16209 Aftermarket ignition switch bracket-to-steering crown bracket mounting bolt LOCK WASHER, zinc-plated alloy steel. For all XJ1100 models. Use 2 per bike. Each:
$ 0.95

HCP16100 Aftermarket ignition switch bracket-to-steering crown bracket mounting bolt LOCK WASHER, 18-8 stainless-steel with a bright finish. For all XJ1100 models. Use 2 per bike. Each:
$ 0.95

HCP16102 Aftermarket ignition switch bracket-to-steering crown bracket mounting bolt LOCK WASHER, black-oxide coated finish. For all XJ1100 models. Use 2 per bike. Each:
$ 0.95



HCP17708 Aftermarket main switch lock cylinder wafer COMPRESSION SPRING. These tiny springs fit underneath each lock cylinder wafer and provides the proper tension to enable the wafer to pop "up" and provide the locking function between the cylinder plug and housing. Use one spring per wafer, six per lock cylinder. Each:
$ 1.95

HCP17708SET6 Aftermarket main switch lock cylinder wafer COMPRESSION SPRING, set of 6 springs:
$ 9.95




Ignition Switch ID Decals:

This round switch bezel key-position identification DECAL help to restore that "brand-new" look to refinished original parts.

HCP7281 Aftermarket ignition switch KEY POSITION ID DECAL, round hollow "ring" decal fits on the ignition switch bezel ring and identifies each key position: OFF, ON, LOCK, P (with is for "Park"), and IGNITION wording. Black decal with silvered lettering. Fits all XJ550, FJ600, XJ650, XJ700, XJ750, XJ900, XJ1100 and XS1100 ignition switches. This is a high-quality reproduction of the original.
$ 12.95




KEY BLANKS:

s) Yamaha KEY BLANKS.....please see the long NOTE at the end of this post for additional detail.

All of the following are the correct blank (un-cut) style keys.

The original keys that came with your bike has a small, truly rectangular head that has a black plastic head cap, and the word YAMAHA was cast into this head cap.

The OEM replacement keys that we offer have the YAMAHA wording in the key head, but no black plastic head cap.

Aftermarket keys are available either with or without the black plastic head cap....but do not have the word YAMAHA cast into them.

The aftermarket plastic cap headed keys are very similar in shape to an original Yamaha key from this era, but are slight more trapezoidal than original (as opposed to being a true rectangle).

The aftermarket metal-headed keys are approximately the same size and shape as original plastic-capped keys. Unlike the replacement keys that most lock shops have available for older Yamaha locks (which will work just fine, but usually have a huge, rather ugly head), our keys have the small rectangular head that is similar in size to original.


NOTE: although we offer the following key BLANKS, we do not offer any pre-cut keys, since we have no way of translating your key code---should you even know it!---into a fully cut key. Nor do we have any method of translating your bike's VIN into the original key-code (some older Yamaha dealers MAY have this information, but don't count on it).

As long as you have a key that fits your lock(s), anyone with a key-cutting machine will be able to copy your key pattern onto any of the following key blanks. Additionally, if you have a professional locksmith in your area.....and one that has been in business for a LONG time (and thus has the older conversion books available), then they may be able to convert your key code and cut a key without having a master key to copy from.


P.S. If you lose your key(s), or obtain a used gas tank that still has a (locked) cap on it but with no key, then it may be time for you to learn the ancient art of lock-picking:

http://www.capricorn.org/~akira/home/lockpick/


All keys have to be ordered according to their Key Blank Style (A-F).

NOTE ON KEY BLANK STYLES: Yamaha used 6 different key blank styles, designated as A, B, C, D, E, or F, and you can re-key an individual lock only to another pattern within the same key blank style.

Originally, your bike came with two keys that were cut to the same pattern and fit ALL of the locks on your bike (ignition switch, gas cap, seat and/or helmet lock, Powerlock chain if so equipped, etc.). These keys were unique to your bike, and were cut to a specific pattern which was identified by a KEY CODE. This key code was stamped onto the key head, and also was either stamped into the base (bottom) of the ignition switch housing, or has a small metallic adhesive-backed tag that had the key code stamped into it and that was affixed to the bottom of the ignition lock housing. THERE IS NO OTHER PLACE ON YOUR BIKE WHERE THIS KEY CODE APPEARS!. None of the other locks on your bike have the key code impressed, stamped, or labeled upon them.

In the old days, you could have Yamaha cut a new key for you by presenting your bike's VIN number to them, as they had VIN-to-Key Code translation information available to them. Few, if any, dealers still have such information still available for these older bikes.


Key Blank Style Determination:

Of course, if you have the original key that came with your bike, then the entire key code (letter and 5 numbers) is stamped onto the key head, right below the black plastic cap.

If not, you can determine what key blank style you have by removing your ignition switch.......and the entire key code is either stamped into the bottom of the switch housing, or is printed or etched onto a paper or aluminum tag that is glued to the bottom of the ignition lock. The key number always starts with one of the letters A-F, followed by 5 or 6 numbers. The 5 or 6 numbers are actually the "serial number" of the individual lock. You can see what this code appears like here:

www.xjbikes.com/forums/threads/no-key-questions-and-other-missing-parts.130762

Note that some switches will have this code on a foil sticker, rather than stamped into the switch body (as shown above).


Swapping Lock Mechanisms:

The lock mechanism can always be removed from an individual component (ignition switch, gas cap, or seat/helmet lock unit) and swapped out from another similar unit. For example, if your bike originally uses locks that accept a "D" style key blank, then you can substitute another "D" style lock mechanism from a donor bike and then have that donor lock re-keyed to match all of your other original locks on your bike.....usually an expensive task at a real locksmith, but it can be done (or you can do it at home, if you have the patience of Job). However, if your bike originally uses locks with a "C" style key blank, and you buy a gas cap with a lock and that gas cap lock uses a "F" style key, you cannot have that "F" style lock mechanism re-keyed to accept the "C" style key.


Hope that isn't too much info.....but when buying replacement parts that incorporate a lock mechanism, it's useful to keep the above in mind in case you want to have all your locks keyed the same.


Finally, remember that except for the ignition switch, the key blank style and key code (A-F) is NOT stamped nor engraved or marked on any other lock mechanism. The only way to determine which key style (for example) another gas cap lock uses is to try a key into it (even a blank, un-cut key); an "A" style key won't fit into a B-F style lock, etc. (although we have found that "C" and "E" blanks will sometimes interchange......). If you're buying a used ignition switch, with or without the key, you'll have a good chance of knowing which key style it uses as there is a key code printed or engraved on the bottom of the switch housing (assuming the printed or engraved label has not gone bye-bye after all these years); all other locks (gas, helmet/seat, and powerlock) you must either have the original key or know the ignition switch key number of the bike that component came from.


Key Blanks:

HCP9186 OEM "A" style KEY BLANK with metal head, no cap
$ 18.95

HCP188 Aftermarket "A" style KEY BLANK with black plastic cap.
$ 12.95

HCP194 Aftermarket "A" style KEY BLANK with metal head; no cap
$ 7.95



HCP9187 OEM "B" style KEY BLANK with metal head, no cap
$ 18.95

HCP189 Aftermarket "B" style KEY BLANK with black plastic cap.
$ 12.95

HCP195 Aftermarket "B" style KEY BLANK with metal head; no cap
$ 7.95



HCP9188 OEM "C" style KEY BLANK with metal head, no cap.
$ 18.95

HCP190 Aftermarket "C" style KEY BLANK with black plastic cap
$ 12.95

HCP196 Aftermarket "C" style KEY BLANK with metal head; no cap
$ 7.95



HCP9189 OEM "D" style KEY BLANK with metal head, no cap.
$ 18.95

HCP191 Aftermarket "D" style KEY BLANK with black plastic cap.
$ 12.95

HCP197 Aftermarket "D" style KEY BLANK with metal head; no cap.
$ 7.95



HCP9190 OEM "E" style KEY BLANK with metal head, no cap.
$ 18.95

HCP192 Aftermarket "E" style KEY BLANK with black plastic cap.
$ 12.95

HCP198 Aftermarket "E" style KEY BLANK with metal head; no cap.
$ 7.95



HCP9191 OEM "F" style KEY BLANK with metal head, no cap.
$ 18.95

HCP193 Aftermarket "F" style KEY BLANK with black plastic cap.
$ 12.95

HCP199 Aftermarket "F" style KEY BLANK with metal head; no cap.
$ 7.95



HCP17031 Aftermarket replacement KEY used on the small locks fitted originally to all Yamaha models with factory saddlebags or trunk systems using the original Presto Lock Company locks. Already "cut", as these locks were standardized (universal) and did not use special coded keys. Each:
$ 6.95



NOTE: the following product(s) can only be shipped via ground transport (which thus eliminates the postal Priority Mail, postal Express Mail, or private carrier Expedited levels of service for this item) and cannot (and will not----don't even ask!) be shipped outside of the continental USA. Additionally, there may be a per-package weight or quantity restriction, and thus multiple-unit orders of this product may have to be shipped in separate packages and will incur additional shipping charges.

HCP20863 Aftermarket super-duty GRAPHITE LUBE, in a generous 10-ounce aerosol can. The 800-pound gorilla of lubricants, it's infused with pure graphite, goes on wet, and then dries in 10 minutes to a super-slick, high-pressure, bearing-like finish which provides the ultimate level of protection. Prevents rust, won't wash off, throw off, and won't attract dust or dirt. Surfaces must be clean and dry of previous oils, etc. before application. Can be used as an engine assembly lube, bearing or bushing pre-lube, great for lock cylinders, and all metallic sliding surfaces. Use where dusty or dirty conditions render oil-based lubricants ineffective or undesirable.
$ 21.95




IGNITION SYSTEM OVERVIEW:

Before we get into the list of components within your ignition system, it may be useful to explore the basics of the ignition design used on these bikes, as this knowledge may help you to better recognize, troubleshoot, and repair performance problems with your engine that you think may be due to these components.

The ignition system actually begins at the left end of your CRANKSHAFT, since the rotational position of the crankshaft determines the position of the pistons and of the camshafts. Obviously, since the purpose of the entire ignition system is to deliver a high-voltage spark at the plugs at exactly the proper instant----meaning, as the piston approaches Top Dead Center of the compression stroke----then the ignition system must "know" what the position of the crankshaft is in order to transfer that information (via electrical signals) to the major components: the PICK-UP COILS, then onto the TCI UNIT, to the IGNITION COILS, via the PLUG WIRES and through the PLUG CAPS and finally, onto the SPARK PLUGS.

But it all begins at the crankshaft, which has a flat metal ROTOR DISC bolted onto the left side snout, and which hides under the left side, round "Oil Pump Cover" (also called a "YICS" cover on YICS-equipped engines). This spinning rotor disc has a small magnet embedded within it's outer tip, and as that outer tip rotates past the fixed magnets within the PICK-UP COILS, the interaction of magnetic fields triggers a small voltage in the pick-up coil wires that lead to the TCI UNIT.

Note that since the rotor disc is fixed in position and spins along with the crankshaft, this rotor disc "knows" the position of the crankshaft at all times. And since the pick-up coils are bolted in place, and are thus stationary, whenever the spinning rotor passes by a fixed pick-up coil, and thus triggers it to send a voltage signal to the TCI, in this way the TCI unit thus also "knows" where the crankshaft is, rotationally-speaking, and thus where the pistons are in relation to Top Dead Center and when their spark plugs need to be fired.......

Also note that since there are only two pick-up coils for your four-cylinder engine, that each pick-up coil is actually providing the "firing signal" to the TCI unit for two different cylinders. In these engines, one pick-up coil is responsible for sending the signal to the TCI that eventually leads to the spark plugs firing off for cylinders #1 and #4 at the same time, and the other pick-up coil sends the message to the TCI unit to fire off spark plugs #2 and #3, again, at the same time.

Although this may seem odd at first, the mechanical arrangement within the engine of the crank throws, and thus the rods and pistons, as well as the camshaft timing, allow this situation to proceed without a problem; in fact, when one of these "paired" cylinders (for example, #1) is approaching Top Dead Center of it compression stroke----and thus is in need of a spark from its spark plug----it's "mated" cylinder (#4) is also approaching Top Dead Center, too.........but on its exhaust stroke.......and so even though cylinder #4 gets a spark at its spark plug, there's nothing in the cylinder to combust, and thus it's a "wasted" (yet harmless) spark that occurs in cylinder #4.

Obviously, the exact same situation occurs in the mated pair of cylinders #2 and #3.

In fact, the whole system is known as the "wasted spark" system, since one of the two sparks that always occur at the same time is "wasted" on a cylinder that is on its exhaust stroke............


Anyway, to continue our journey: when a pick-up coil is energized by the passing magnetic field of the spinning rotor disc, it send an electrical impulse signal to the TCI. Therefore, the TCI unit now also "knows" the position of the crankshaft (and thus of the piston). Using other sensor information.....primarily, the rotational speed (RPM's) of the engine......the computer chip in the TCI is then responsible for calculating exactly when to send a "message" to the proper IGNITION COIL to release it's energy to the proper cylinders. And note that we said "cylinders" (plural), since just like the pick-up coils, one ignition coil also sparks two cylinders at once (part of the same "wasted spark" method discussed above).


The ignition coils use a rather small (12V) input on their primary side to product a large (20,000V +) amount of electrical energy on their discharge (spark plug wires). When the TCI unit determines that "the time is right" for a particular coil to fire, it grounds that coil, which collapses the small magnetic field inside the primary side of the coil, which thus induces a large electrical field in the secondary (plug wires) side of the coil, which then rushes to ground. This electrical energy rushes down the non-resistive PLUG WIRES, through a resistor in the SPARK PLUG CAP, and finally jumps a small gap in the spark plug electrode on it's way to ground, and thus the spark occurs that fires the air-fuel mixture (in one of the two cylinders being sparked at the same time), things go boom, power gets produced, and you're on the way down the road........

A great explanation and diagram---starting at the 4:15 mark in the video---explains all of the above in a very simplified, yet understandable detail:




By the way, the firing order for the XJ550 thru XJ900 engines is 1-2-4-3, with the two center pistons coming up while the two outer pistons are going down, and the direction of engine rotation is in the same direction as your tires rotate when moving forward.



Now, What Could Go Wrong?:

Well, remember, all of these components are basically used to transmit knowledge of where the piston is within its four-stroke cycle, and to be able to deliver a spark at the appropriate time to each cylinder to take advantage of the compressed air-fuel mixture in the cylinder (during the compression stroke). So it sometimes help to understand these component pieces as being mainly responsible for providing this stream of precise information, and the electrical-spark making (at the spark plug gap) as merely being the natural (according to the laws of physics and electricity) end-result of all this information handling and processing.


Now, unless your crankshaft was installed backwards (an impossibility, by the way!) or the camshaft was installed improperly (or if the camshaft drive chain has skipped a tooth----not a common occurrence, at all), then we can safely ignore all of these issues. And since the spinning rotor disc used to trigger the pick-up coils is bolted firmly in place at the end of the crankshaft, it can be ignored for troubleshooting issues.


But the pick-up coils themselves can go bad over time, and even though it's rare, it can happen. No pick-up coil signal out----along their wires to the TCI unit-----means no signal into the TCI unit, and the whole system breaks down. Which means the small wires from the pick-up coils to the TCI had better not be pinched, shorted to ground, or broken internally, or the message just won't get through.

NOTE: if you are having intermittent or difficult-to-diagnose ignition system problems, it may be that the wire leads from the pick-up coils (under the left round crank-end cover) have become pinched where they exit the cover and have worn through their insulation.


Of course, if the TCI unit itself is defective, then even if it is getting a signal from the pick-up coils, it is unable or unwilling to process the signal, or the signal gets processed incorrectly, and either the signal doesn't get sent to the ignition coils at the proper time, or doesn't get sent at all.


But even if the pick-up coils and the TCI are performing flawlessly---which they usually are----if the ignition coils are not getting enough voltage input to them, or, if they are not able to multiply the small incoming voltage into a much higher output voltage (that is, after all, their main purpose in life), then we have a problem.

Worn-out ignition coils, or coils that perform poorly or get cracks in their outer cases (and thus short out when moisture enters their internal shells), are a common cause of ignition system problems.


And even if the coils are performing properly, if the spark plug wires have an internal break, or an external break, and thus prevent the coil electrical output from reaching the plugs, then nothing good is going to come from all this activity.


Of course, the spark plug Resistor Caps also play a role. They have a tiny resistor embedded within them, and the purpose of the resistor is to provide, of course, electrical resistance to the flow of electrical energy. There are a couple of reasons why some resistance is necessary-----it helps eliminate electrically-generated Radio Frequency Interference "noise" (RFI), it provides a "cushion" against instantaneous electrical energy pulses (which is really hard on small, fragile electrical components, such as the capacitors and transistors in the TCI unit), and it "slows down" the passage of the electricity through the spark plug, thus providing a sort of "electrical Viagra" to spark at the plugs, allowing the electrical discharge (and thus the spark) to last a bit longer (instead of being instantaneous), thus promoting more-better and fuller combustion of the air-fuel mixture.

In fact, outside of the RFI suppression issues, it is the control of this "spark burn time" that is really the most critical issue, especially on bikes that are jetted a bit lean to begin with........as increased electrical resistance in the secondary circuit will increase the spark firing or "burn" time, and that longer burning spark assists in the more complete combustion of harder-to-fire lean fuel mixtures.


But those resistors in the spark plug caps........or in the spark plugs themselves, for those engines that use resistor plugs........do wear out over time. And when they do, their resistance increases, which means that they provide more resistance to the flow of electricity than is needed. So that 20,000 volts of electrical energy, instead of being discharged at the spark plug gap in a rather short (10 milliseconds) amount of time, gets "spread out" over a much longer period of time, and gets reduced in voltage, too. So when plug caps or plugs "go bad", they rarely fail to the point where no spark occurs at all, it's just that the electrical output is being "spread out" over such a long period of time that the energy being created in the spark plug gap is so low that it's not enough to fire the fuel mixture completely (or at all)........and that's what leads to hard starts and poor performance (and reduced gas mileage, too).

By the way, as you may have figured out by now, a spark plug that is contaminated ("fouled") by carbon or oil deposits, or one which has too large of a gap, fail to operate properly mainly because such situation can greatly increase the electrical resistance characteristics of such a plug.........and now you know why that's not a good thing.

NOTE: some models specify a different (higher) plug cap resistance for the inner 2 cylinders vs. the outer cylinders. The probable reason for this is that the inner pair of cylinders may run a bit leaner (at least on some engines) since they run warmer, and also because the YICS system should allow the inner pair to “steal” more than the outer pair. If they’re really effectively leaner, they'll need a longer duration of a spark to ignite their charge, and of course the way to achieve that is: you guessed it, increased resistance on those inner cylinders!


A very good review of the issue of electrical resistance in ignition systems can be found at:

http://www.motorcycleproject.com/motorcycle/text/plugwiretech.html

and

http://www.ultralightnews.com/enginetroublshooting/resistorcapsandplugs.htm

Although the above article references the ignition systems in ultra-light aircraft, the same concepts apply to all ignition systems.


Okay, so that's your nickel tour, and although it's not as detailed as it could be, hopefully it's enough to get you started. A good voltmeter (also called an ohmmeter) is an invaluable friend when trying to track down ignition system problems, as you must make sure that the "information" between components is actually able to travel from Point A to Point B properly, and that the individual components are, electrically-speaking, able to process and transmit the electrical information properly.



SO, WHY WON’T IT START?

Well, in order for your engine to start and run, you’ve got to have fuel, spark, and enough engine compression.

The following article is THE authoritative testing procedure if you suspect a no-start situation is due to ignition system issue. Obviously, it assumes that:

a) you are getting fuel into the carbs (verify this by loosening one (or all of them, but one at a time!) of the carb bowl drain screws and see if some fuel leaks out. If so, you got fuel! If not, you’ll need to tackle this issue and figure out why.

b) you have good engine compression. If you’re not sure, you’ll need to perform a compression test and verify that then engine is making enough compression.

c) your battery should be fully charged:

While the starter is engaged (but before the bike starts), the battery voltage should be 9.5 volts or greater. If not, then this signals either a bad battery, very dirty or weak electrical connections, or it could be an incredibly problematic starter motor (not likely; it's probably the battery!).

A low voltage during cranking will prevent the ignition coils from getting enough voltage to charge themselves enough to deliver a good spark to the plugs.

http://www.xjbikes.com/forums/threads/how-to-ignition-troubleshooting.21932/




Ignition system firing order:

It's 1-2-4-3 for all engines.



Ignition system components resistance specifications:

The following list also covers the resistance values of the spark plugs, plug caps, the ignition pick-up coils (which are located behind the left side round crankshaft end cover)m and the ignition coils. The resistance of the pick-up coils can be checked at their connector to the TCI box by measuring the resistance between the grey and the black wire (this checks the condition of the first pick-up coil) and then between the orange and the black wire (this is the resistance of the other pick-up coil).

NOTE: "K" is abbreviation for a thousand units, so "5K" ohms = 5,000 ohms of resistance, etc.

NOTE: some models within this era could have been fitted with "noise suppression" plug caps (these caps are evidenced by a metal "shield" wrapped around the plastic cap body) and such caps may have used a higher resistance rating as opposed to their stock ratings listed below (for non "noise suppression" style caps).


XJ550 models:

Pick-up coils:
650 ohms +/- 20% = 520 ohms to 780 ohms acceptable range


Ignition Coils:

Primary side (input from main wiring harness):
2.5 ohms +/- 10% = 2.25 ohms - 2.75 ohms acceptable range

Secondary side (spark plug wires, without their end caps):
11K ohms +/- 20% = 8,800 ohms - 13,200 ohms acceptable range


Spark plug caps:
10K +/- 20% = 8,000 to 12,000 ohms per cap acceptable range

Spark plugs:
0 ohms per plug




XJ650 models:

Pick-up coils:
1980-81 XJ650 Maxim and Midnight Maxim: 700 ohms +/- 20% = 560 ohms to 840 ohms acceptable range
1982 XJ650RJ Seca (non-yics engines): 700 ohms +/- 20% = 560 ohms to 840 ohms acceptable range
1982-84 XJ650 Maxim: 650 ohms +/- 20% = 520 ohms to 780 ohms acceptable range
1982 XJ650RJC Seca (yics engine): 650 ohms +/- 20% = 520 ohms to 780 ohms acceptable range
1982-83 XJ650 Turbo: 120 ohms +/- 20% = 96 ohms to 144 ohms acceptable range


Ignition Coils:

Primary side (input from main wiring harness):
2.5 ohms +/- 10% = 2.25 ohms - 2.75 ohms acceptable range

Secondary side (spark plug wires, without their end caps):
11K ohms +/- 20% = 8,800 ohms - 13,200 ohms acceptable range


Spark plug caps:
5K +/- 20% = 4,000 to 6,000 ohms per cap acceptable range

Spark plugs:
0 ohms per plug




XJ700 air-cooled models:

Pick-up coils:
120 ohms +/- 20% = 96 ohms to 144 ohms acceptable range


Ignition Coils:

Primary side (input from main wiring harness):
2.7 ohms +/- 10% = 2.43 ohms - 2.97 ohms acceptable range

Secondary side (spark plug wires, without their end caps):
12K ohms +/- 20% = 9,600 ohms - 14,400 ohms acceptable range


Spark plug caps:
1985 N/NC models: 5K +/- 20% = 4,000 to 6,000 ohms per cap acceptable range
1986 S/SC models: 10K +/- 20% = 8,000 to 12,000 ohms per cap acceptable range


Spark plugs:
1985 N/NC models: 0 ohms per plug
1986 S/SC models: 5K ohms per plug




XJ700-X water-cooled models:

Pick-up coils:
120 ohms +/- 20% = 96 ohms to 144 ohms acceptable range


Ignition Coils:

Primary side (input from main wiring harness):
2.7 ohms +/- 10% = 2.43 ohms - 2.97 ohms acceptable range

Secondary side (spark plug wires, without their end caps):
12K ohms +/- 20% = 9,600 ohms - 14,400 ohms acceptable range


Spark plug caps:
10K +/- 20% = 8,000 to 12,000 ohms per cap acceptable range


Spark plugs:
1985 XN/XNC models: 0 ohms per plug
1986 SX/SXC models: 5K ohms per plug




XJ750 air-cooled models:

Pick-up coils:
650 ohms +/- 20% = 520 ohms to 780 ohms acceptable range


Ignition Coils:

Primary side (input from main wiring harness):
2.5 ohms +/- 10% = 2.25 ohms - 2.75 ohms acceptable range

Secondary side (spark plug wires, without their end caps):
11K ohms +/- 20% = 8,800 ohms - 13,200 ohms acceptable range


Spark plug caps:
1981-83 models: 5K +/- 20% = 4,000 to 6,000 ohms per cap acceptable range
1984 RL models: 10K +/- 20% = 8,000 to 12,000 ohms per cap acceptable range

Spark plugs:
0 ohms per plug




XJ750-X water-cooled models:

Pick-up coils:
120 ohms +/- 20% = 96 ohms to 144 ohms acceptable range


Ignition Coils:

Primary side (input from main wiring harness):
2.7 ohms +/- 10% = 2.43 ohms - 2.97 ohms acceptable range

Secondary side (spark plug wires, without their end caps):
12K ohms +/- 20% = 9,600 ohms - 14,400 ohms acceptable range


Spark plug caps:
10K +/- 20% = 8,000 to 12,000 ohms per cap acceptable range

Spark plugs:
5K ohms per plug




XJ900RK, RL, N, FN, and F models:

Pick-up coils:
120 ohms +/- 20% = 96 ohms to 144 ohms acceptable range


Ignition Coils:

Primary side (input from main wiring harness):
original coils, marked CM12-20: 2.7 ohms +/- 10% = 2.43 ohms - 2.97 ohms acceptable range
replacement coils, marked CM12-09 or CM12-10: 2.5 ohms +/- 10% = 2.25 ohms - 2.75 ohms acceptable range

Secondary side (spark plug wires, without their end caps):
original coils, marked CM12-20: 13.2K ohms +/- 20% = = 10,560 ohms - 15,840 ohms acceptable range
replacement coils, marked CM12-09 or CM12-10: 11K ohms +/- 20% = 8,800 ohms - 13,200 ohms acceptable range


Spark plug caps:
RK and RL models: 5K +/- 20% = 4,000 to 6,000 ohms per cap acceptable range
N, FN, and F models: 10K +/- 20% = 8,000 to 12,000 ohms per cap acceptable range
S and SH models: 15K +/- 20% = 12,000 to 18,000 ohms per cap acceptable range

Spark plugs:
RK and RL models: 0 ohms per plug
N, FN, and F models: 5K ohms per plug




XJ1100 models:

Pick-up coils:
120 ohms +/- 20% = 96 ohms to 144 ohms acceptable range


Ignition Coils:

Primary side (input from main wiring harness):
2.5 ohms +/- 10% = 2.25 ohms - 2.75 ohms acceptable range

Secondary side (spark plug wires, without their end caps):
11K ohms +/- 20% = 8,800 ohms - 13,200 ohms acceptable range


Spark plug caps:
5K +/- 20% = 4,000 to 6,000 ohms per cap acceptable range

Spark plugs:
0 ohms per plug




XS1100 models:

Pick-up coils:
720 ohms +/- 20% = 576 ohms to 864 ohms acceptable range


Ignition Coils:

Primary side (input from main wiring harness):
1.5 ohms +/- 10% = 1.35 ohms -1.65 ohms acceptable range

Secondary side (spark plug wires, without their end caps):
15K ohms +/- 20% = 12,000 ohms - 18,000 ohms acceptable range


Spark plug caps:
5K +/- 20% = 4,000 to 6,000 ohms per cap acceptable range

Spark plugs:
0 ohms per plug




IGNITION PICK-UP COILS:

One of the nice things about the stock XJ electrical systems is the transistorized (maintenance free) ignition systems.......no points to set or timing to adjust (except on 1986 XJ700-X models). All of those dreadful chores are handled for you, automatically, via the IGNITION PICK-UP COILS SYSTEM, and further down the line, via the TCI CONTROL MODULE. These components are generally very reliable, almost to the point of being bulletproof, and as mentioned, are truly "plug-and-play" devices that need no periodic maintenance once installed. However, they are quite susceptible to damage via electrical shorts or voltage surges (i.e. if you jumper the battery incorrectly, etc.).


Checking pick-up coils:

The resistance across each pair of lead wires (at the TCI) should be checked as shown in the following video……note that resistance valves specified in the service manual is for measurements taken at 70-F, and as the coils heat up, their resistance values will change, and the use of a hair dryer or heat gun to warm up the coils is simple way to see if values go way out of range as the coils heat up:




Resistance values at 70-F are as follows:

120 ohms +/- 10% for all XJ650 Turbo models, XJ700 all models and XJ750-X models, XJ900RK, RL, N/FN, and F models, and XJ1100 models.

650 ohms +/- 20% for all XJ550 models, 1982-84 XJ650 Maxim, 1982 XJ650RJC Seca (Canadian, yics-engine), and all XJ750 models.

700 ohms +/- 20% for all 1980-81 XJ650 models and 1982 XJ650RJ (non-yics engine) models.

720 ohms +/- 20% for all XS1100 models

NOTE: if measuring the resistance when the pick-up coils are hot (i.e. after the engine has been running for 20 minutes or more, such that the pick-up coils are fully heat-saturated), then the resistance readings will be higher by 100 – 150F than at the 70-F “cold” readings shown above.

NOTE: if both coils are out of specifications, suspect a pinched or shorted black ground wire, which is a shared ground for both of the pick-up coils on most models. It is very unlikely (although not impossible, especially in a case of improper jump-starting, etc.) that BOTH pick-up coils would expire at the same time!


A simple test to see if the coils are working, at all is to place a voltmeter (preferably an analog unit) across the Grey or the Orange wire to the Black wire. Energize the system and watch for voltage pulses as you rotate the reluctor past the pickup. This can be done by hand or with the starter.......we'd recommend using the hand method so that the pulses are slow enough to see. These "pulses" are what the TCI "black box" counts and interprets when "deciding" when to fire the ignition coils.


NOTE: the orange lead wire is the trigger wire for the #1/#4 ignition coils, while the grey lead wire is the trigger for the #2/#3 ignition coils.


Pick-Up Coils Baseplate and Lead Wire Harness:

NOTE: whenever you remove or replace your pick-up coils Baseplate unit, it will be necessary to check and perhaps adjust the engine timing. See your factory service or workshop manual for the proper procedure to check and/or adjust your ignition timing!

NOTE: the screws that hold the unit to the engine case are lock-tighted in place, and we strongly suggest that you use a proper-szie (#2) JIS screwdriver to remove them!


HCP503 OEM pick-up coils COILS AND BASEPLATE UNIT, for all XJ700, XJ750-X, and XJ900RK, RL, N/FN, and F models.
$ 429.00



HCP15736 Aftermarket pick-up coils-to-baseplate MOUNTING SCREW, with integral lockwasher. For all XJ550, XJ650, XJ700, XJ750, XJ900RK, RL, and N/FN models, and XJ1100 models, use 2 per coil. NOTE: these screws should be installed with a low-strength thread locking fluid on their threads. Each:
$ 1.95



HCP4189 OEM pick-up coils pick-up coils baseplate LOCATING DOWEL PIN, for all XJ550, FJ600, XJ650, XJ700, XJ750, and all XJ900RK, RL, N/FN, and F models, use 1 per engine.
$ 2.50


HCP314 OEM pick-up coils baseplate MOUNTING SCREW, for all XJ550, 1984 FJ600 models, XJ650, XJ750, XJ900RK, RL, and N/FN models, and XJ1100 models, use 2 per base. Zinc-plated alloy steel, panhead, phillips-drive. NOTE: these screws should be installed with a low-strength thread locking fluid on their threads. Each:
$ 3.95

HCP5335 OEM pick-up coils baseplate MOUNTING SCREW, for all XJ550, 1984 FJ600 models, XJ650, XJ750, XJ900RK, RL, and N/FN models, and XJ1100 models, use 2 per base. Black alloy steel, panhead, phillips-drive. NOTE: these screws should be installed with a low-strength thread locking fluid on their threads. Each:
$ 2.95

HCP915 Aftermarket pick-up coils baseplate MOUNTING SCREW, for all XJ550, 1984 FJ600 models, XJ650, XJ750, XJ900RK, RL, and N/FN models, and XJ1100 models, use 2 per base. Zinc-plated alloy steel, panhead, phillips-drive. NOTE: these screws should be installed with a low-strength thread locking fluid on their threads. Each:
$ 1.95

HCP316 Aftermarket pick-up coils baseplate MOUNTING SCREW, for all XJ550, 1984 FJ600 models, XJ650, XJ750, XJ900RK, RL, and N/FN models, and XJ1100 models, use 2 per base. 18-8 stainless steel, panhead, phillips-drive. NOTE: these screws should be installed with a low-strength thread locking fluid on their threads. Each:
$ 1.95

HCP317 Aftermarket pick-up coils baseplate MOUNTING SCREW, for all XJ550, 1984 FJ600 models, XJ650, XJ750, XJ900RK, RL, and N/FN models, and XJ1100 models, use 2 per base. 18-8 stainless steel with a polished button head, hex-drive. NOTE: these screws should be installed with a low-strength thread locking fluid on their threads. Each:
$ 2.50

HCP318 Aftermarket pick-up coils baseplate MOUNTING SCREW, for all XJ550, 1984 FJ600 models, XJ650, XJ750, XJ900RK, RL, and N/FN models, and XJ1100 models, use 2 per base. 18-8 stainless steel with a smooth, polished socket head, hex-drive. NOTE: these screws should be installed with a low-strength thread locking fluid on their threads. Each:
$ 2.50

HCP320 Aftermarket pick-up coils baseplate MOUNTING SCREW, for all XJ550, 1984 FJ600 models, XJ650, XJ750, XJ900RK, RL, and N/FN models, and XJ1100 models, use 2 per base. Black-oxide coated alloy steel with a ribbed socket head. NOTE: these screws should be installed with a low-strength thread locking fluid on their threads. Each:
$ 1.95



HCP4184 OEM pick-up coils baseplate MOUNTING SCREW, for all 1985 FJ600 models, XJ700, XJ750-X, and XJ900 N/FN models, use 2 per base. NOTE: these bolts should be installed with a low-strength thread locking fluid on their threads. Each:
$ 2.25



HCP3575 OEM pick-up coils baseplate FLAT WASHER, for all 1981-82 XJ550, 1980-82 XJ650 (except Turbo), 1981-82 XJ750 Seca, and 1982 XJ750 Maxim models, use 2 per base. Each:
$ 1.95


HCP2173 OEM pick-up coils baseplate FLAT WASHER, for all 1983 XJ550, 1985 FJ600 models, 1983-4 XJ650 Maxim and all XJ650 Turbo, 1983 XJ750 Seca, 1983 XJ750 Maxim and Midnight Maxim models, and XJ900RK, RL, N/FN, and F models, use 2 per base, original bright finish, each:
$ 1.95

HCP6642 Aftermarket pick-up coils baseplate FLAT WASHER, zinc-plated alloy steel with a natural finish, for all 1983 XJ550, 1985 FJ600 models, 1983-4 XJ650 Maxim and all XJ650 Turbo, 1983 XJ750 Seca, 1983 XJ750 Maxim and Midnight Maxim models, and XJ900RK, RL, N/FN, and F models, use 2 per base, each:
$ 0.95

HCP6643 Aftermarket pick-up coils baseplate FLAT WASHER, 18-8 stainless steel with a natural finish, for all 1983 XJ550, 1985 FJ600 models, 1983-4 XJ650 Maxim and all XJ650 Turbo, 1983 XJ750 Seca, 1983 XJ750 Maxim and Midnight Maxim models, and XJ900RK, RL, N/FN, and F models, use 2 per base, each:
$ 1.25

HCP25756 Aftermarket pick-up coils baseplate FLAT WASHER, 316 stainless steel with a natural finish, for all 1983 XJ550, 1985 FJ600 models, 1983-4 XJ650 Maxim and all XJ650 Turbo, 1983 XJ750 Seca, 1983 XJ750 Maxim and Midnight Maxim models, and XJ900RK, RL, N/FN, and F models, use 2 per base, each:
$ 1.95

HCP14285 Aftermarket pick-up coils baseplate FLAT WASHER, black oxide-coated 18-8 stainless steel, for all 1983 XJ550, 1985 FJ600 models, 1983-4 XJ650 Maxim and all XJ650 Turbo, 1983 XJ750 Seca, 1983 XJ750 Maxim and Midnight Maxim models, and XJ900RK, RL, N/FN, and F models, use 2 per base, each:
$ 1.95

HCP14284 Aftermarket pick-up coils baseplate FLAT WASHER, black oxide-coated hardened alloy steel, for all 1983 XJ550, 1985 FJ600 models, 1983-4 XJ650 Maxim and all XJ650 Turbo, 1983 XJ750 Seca, 1983 XJ750 Maxim and Midnight Maxim models, and XJ900RK, RL, N/FN, and F models, use 2 per base, each:
$ 2.95



HCP315 OEM pick-up coils baseplate LOCK WASHER, for all XJ1100 Maxim models, use 2 per base. Each:
$ 2.95

HCP916 Aftermarket zinc-plated alloy steel with a natural finish, pick-up coils baseplate LOCK WASHER, for all XJ1100 Maxim models, use 2 per base. Each:
$ 1.25

HCP319 Aftermarket 18-8 stainless steel pick-up coils baseplate LOCK WASHER, for all XJ1100 Maxim models, use 2 per base. Each:
$ 1.50

HCP321 Aftermarket black oxide-coated alloy steel pick-up coils baseplate LOCK WASHER, for all XJ1100 Maxim models, use 2 per base. Each:
$ 1.75



NOTE: make sure that you do NOT pinch the lead wire harness as it is routed in-between the rear pick-up coils engine cover and the front of the shifter cover.....it is a very tight, constrained space where this harness is routed, and it is easy to pinch the wires, especially when removing and replacing the shifter cover.


HCP4180 OEM pick-up coils wiring lead harness CLAMP, u-shaped open clamp closest to the pick-up base. Use one on all XJ650, XJ700, XJ750, all XJ900RK, RL, N/FN, and F models, and two on XJ1100 models. Each:
$ 8.95

HCP4181 OEM pick-up coils wiring lead harness CLAMP, u-shaped open clamp farthest from the pick-up base. Use one on all XJ650, XJ700, XJ750, and all XJ900RK, RL, N/FN, and F models. Each:
$ 7.95

HCP4183 OEM pick-up coils wiring lead harness CLAMP, flat L-shaped clamp that is attached at the front lower shifter cover bolt. Use one on all XJ650, XJ700, XJ750, and all XJ900RK, RL, N/FN, and F models. Each:
$ 6.95





Pick-Up Coil Rotor ("Reluctor") Disc:

HCP497 OEM pick-up coils ROTOR DISC, for all XJ700 non-X models.
$ 89.00

HCP498 OEM pick-up coils ROTOR DISC, for all XJ700-X, XJ750-X, and XJ900RK, RL, N/FN, and F models.
$ 69.95


NOTE: the bolt that hold the reluctor to the crankshaft is lock-tighted in place, and we strongly suggest that you use a bit of heat to "loosen" the lock-tight when removing it (and re-use lock-tight when re-installing).

HCP505 OEM pick-up coils rotor disc MOUNTING BOLT, for all XJ550, FJ600, XJ650, XJ700, XJ750, and XJ900RK and RL models.
$ 4.95

HCP23282 Aftermarket pick-up coils rotor disc MOUNTING BOLT, bright 18-8 stainless steel. Use on all XJ550, FJ600, XJ650, XJ700, XJ750, and XJ900RK and RL models.
$ 2.95

HCP23283 Aftermarket pick-up coils rotor disc MOUNTING BOLT, magni-coated (dull aluminum finish, ultra-corrosion resistance) alloy steel. Use on all XJ550, FJ600, XJ650, XJ700, XJ750, and XJ900RK and RL models.
$ 2.95



Pick-Up Coil Timing Pointer:

NOTE: you should not find it necessary to ever move or remove the pointer; however, if that is necessary, upon replacement you will need to check and perhaps adjust and set the TDC of the engine and/or the engine timing. See your factory service or workshop manual for the proper procedure to check and/or adjust your ignition timing!


HCP314 OEM pick-up coils timing pointer MOUNTING SCREW, for all XJ550, XJ650, 1985 XJ700, XJ750 non-X, and XJ900RK models, use 1 per engine. Zinc-plated alloy steel, panhead, phillips-drive Each:
$ 3.95

HCP5335 OEM pick-up coils timing pointer MOUNTING SCREW, for all XJ550, XJ650, 1985 XJ700, XJ750 non-X, and XJ900RK models, use 1 per engine. Black alloy steel, panhead, phillips-drive. Each:
$ 2.95

HCP915 Aftermarket pick-up coils timing pointer MOUNTING SCREW, for all XJ550, XJ650, 1985 XJ700, XJ750 non-X, and XJ900RK models, use 1 per engine. Zinc-plated alloy steel, panhead, phillips-drive Each:
$ 1.95

HCP316 Aftermarket pick-up coils timing pointer MOUNTING SCREW, for all XJ550, XJ650, 1985 XJ700, XJ750 non-X, and XJ900RK models, use 1 per engine. 18-8 stainless steel, panhead, phillips-drive. Each:
$ 1.95

HCP317 Aftermarket pick-up coils timing pointer MOUNTING SCREW, for all XJ550, XJ650, 1985 XJ700, XJ750 non-X, and XJ900RK models, use 1 per engine. 18-8 stainless steel with a polished button head, hex-drive. Each:
$ 2.50

HCP318 Aftermarket pick-up coils timing pointer MOUNTING SCREW, for all XJ550, XJ650, 1985 XJ700, XJ750 non-X, and XJ900RK models, use 1 per engine. 18-8 stainless steel with a smooth, polished socket head, hex-drive. Each:
$ 2.50

HCP320 Aftermarket pick-up coils timing pointer MOUNTING SCREW, for all XJ550, XJ650, 1985 XJ700, XJ750 non-X, and XJ900RK models, use 1 per engine. Black-oxide coated alloy steel with a ribbed socket head. Each:
$ 1.95



HCP2173 OEM pick-up coils timing pointer FLAT WASHER, for all XJ550 models, use 1 per engine, original bright finish, each:
$ 1.95

HCP6642 Aftermarket pick-up coils timing pointer FLAT WASHER, zinc-plated alloy steel with a natural finish, for all XJ550 models, use 1 per engine, each:
$ 0.95

HCP6643 Aftermarket pick-up coils timing pointer FLAT WASHER, 18-8 stainless steel with a natural finish, for all XJ550 models, use 1 per engine, each:
$ 1.25

HCP25756 Aftermarket pick-up coils timing pointer FLAT WASHER, 316 stainless steel with a natural finish, for all XJ550 models, use 1 per engine, each:
$ 1.95

HCP14285 Aftermarket pick-up coils timing pointer FLAT WASHER, black oxide-coated 18-8 stainless steel, for all XJ550 models, use 1 per engine, each:
$ 1.95

HCP14284 Aftermarket pick-up coils timing pointer FLAT WASHER, black oxide-coated hardened alloy steel, for all XJ550 models, use 1 per engine, each:
$ 2.95



HCP3575 OEM pick-up coils timing pointer FLAT WASHER, for all XJ650, 1985 XJ700, XJ750, and XJ900RK, RL, and N/FN models, use 1 per engine. Each:
$ 1.95


HCP315 OEM pick-up coils timing pointer LOCK WASHER, for all XJ550 models, use 1 per engine. Each:
$ 2.95

HCP916 Aftermarket zinc-plated alloy steel with a natural finish, pick-up coils timing pointer LOCK WASHER, for all XJ550 models, use 1 per engine. Each:
$ 1.25

HCP319 Aftermarket 18-8 stainless steel pick-up coils timing pointer LOCK WASHER, for all XJ550 models, use 1 per engine. Each:
$ 1.50

HCP321 Aftermarket black oxide-coated alloy steel pick-up coils timing pointer LOCK WASHER, for all XJ550 models, use 1 per engine. Each:
$ 1.75




ec2) OEM oil pump/crankshaft end cover ("YICS covers" on models so equipped) COVER GASKET. A great idea to replace these if you remove the case covers. Although these gaskets don't seal any fluids, you don't really want grime and gunk and junk accumulating inside the covers.

OEM oil pump cover gaskets are made from a standard duty, graphite impregnated paper material. We recommend the use of the aftermarket hi-performance paper gaskets which are designed to slightly swell in the presence of petroleum products (fuel or oil), thus creating a super-tight, leak-proof flange seal.


HCP998 OEM oil pump covers or "YICS" covers standard duty paper GASKET. Originally used under the left side cover only, but many people like to install one under the right side cover also, and they will fit either side properly. Fits all XJ550, FJ600, XJ650, 1981-83 all XJ750 models, XJ750RL, and all XJ900RK, RL, N/FN, and F models. Each:
$ 14.95

HCP998SET2 OEM oil pump covers or "YICS" covers standard duty paper GASKETS, set of 2:
$ 27.95


HCP18438 Aftermarket oil pump covers or "YICS" covers hi-performance GASKET. Originally used under the left side cover only, but many people like to install one under the right side cover also, and they will fit either side properly. Fits all XJ550, FJ600, XJ650, 1981-83 all XJ750 models, XJ750RL, and all XJ900RK, RL, N/FN, and F models. Each:
$ 12.95

HCP18438SET2 Aftermarket oil pump covers or "YICS" covers hi-performance GASKETS, set of 2:
$ 24.95



HCP999 OEM crankshaft end cover-to-block rubber RING GASKET, fits all 1986-88 FZ600, 1986-90 YX600 Radian, all XJ700, XJ750-X, 1984-85 FJ1100, and 1986-93 FJ1200 models. Right and left side are the same. Each:
$ 32.95

HCP999SET2 OEM crankshaft end cover-to-block RING GASKETS, set of 2:
$ 62.95


HCP25160 Aftermarket crankshaft end cover-to-block rubber RING GASKET, fits all 1986-88 FZ600, 1986-90 YX600 Radian, all XJ700, XJ750-X, 1984-85 FJ1100, and 1986-93 FJ1200 models. Right and left side are the same. Each:
$ 19.95

HCP25160SET2 Aftermarket crankshaft end cover-to-block RING GASKETS, set of 2:
$ 37.95




HCP5795 OEM "YICS" or "DOHC" cover-to-block rubber RING GASKET, fits all XJ750 Midnight Maxim, XJ750RL, and all XJ900RK, RL, N/FN, and F models. Right and left side are the same. Each:
$ 39.75



HCP1001 OEM "YICS" cover-to-block standard duty paper GASKET, fits all XJ1100 and XS1100 models. Used on the left side only. Each:
$ 29.95

HCP18439 Aftermarket "YICS" cover-to-block hi-performance GASKET, fits all XJ1100 and XS1100 models. Used on the left side only. Each:
$ 22.95




TCI UNITS:

Yamaha (thankfully!) used a TCI (which stands for Transistor Controlled Ignition) system on all XJ-series bikes to control the coils, timing, spark advance, etc. A TCI unit is an "early" version of the now-common electronic control systems that are used on virtually all modern vehicles of almost every type, and even these early versions are completely maintenance-free and very rarely cause problems...........which is a good thing, because original TCI boxes are no longer available new.

When engine performance problems develops, many people immediately suspect that the cause may be within the "black box" workings of their TCI unit, which is unlikely. The factory service manual gives "instructions" for diagnosing TCI problems, and it basically says "test every other possible cause for your problem and if no other cause for the problem exists, only then should you "suspect" TCI failure, but before you buy a replacement, first try to find a known, working TCI unit from a similar bike and plug it in on the problem bike, and see if the problem goes away............"

Well!

There are three main problems that TCI units succumb to after years of reliable service:

1) bad solder joints on some of the internal components (known as "cold solder joints") result in the component pieces coming loose from the circuit board, and thus they can no longer perform their function reliably (or at all).

2) component failure......a blown-up transistor, a burned circuit trace, etc. This situation can develop if you have a short-circuit in your electrical system, or hook up your battery or jumper cables incorrectly, etc. TCI units do not like "big blue sparks" in the electrical system (except at the spark plugs, of course!).

3) another common failure of these units occurs if the TCI is continuously grounding the ignition coil (i.e. its output driver is shorted). You can verify this situation with an ohmmeter with the following tests:

- disconnect the 2-pin plug at the ignition coil and measure from the orange or grey wire to the chassis. You should see very high resistance. This should be pretty close on both the working and non-working channels.

- if you read a few ohms of resistance or less, then the TCI is bad. A shorted driver will also make the ignition coil run very hot and may ruin the coil.

4) dirty external terminal connections.


Bad solder joints can be repaired by someone who is skilled at that sort of diagnosis and repair, and even individual circuit components can be replaced, but it's tough to find someone in the modern world of "pitch-and-plug" skill-sets who actually has the skill and patience to do this type of work. Yamaha gave absolutely "zero" electrical specifications for checking the condition of the TCI units, besides the afore-mentioned "check everything else first" type of diagnosis.

But you can perform a simple set of tests to determine whether your TCI unit is good or not, without having a second, known good unit to install in place of the suspect unit. Although these instructions were written for XS owners, the exact same thoughts apply to the TCI units on the XJ-series of bikes:

http://www.xs11.com/forum/showthread.php?t=38224&highlight=tci+repair

The above is stolen, borrowed or even plagiarized from Randy Rado's site before it went away. It does require an analog meter as digital multi-meters do not show the swing of the needle that is required to test it.

"Using a voltmeter set on 12VDC, connect the positive meter lead to the Orange or Grey pick-up coil lead at the TCI. Connect the negative meter lead to the black (negative) lead at the TCI. Turn on the ignition. Voltage should come right up to about 10 - 11VDC. Crank the ignition and observe the meter. Look for a wide voltage swing during cranking. A strong swing indicates that the pickups and TCI are working OK and your trouble is between the TCI and the plugs. Possibly a bad ballast resistor, bad coil, bad plug cap or just corroded connections. Repeat this test for both Orange and Grey coil leads."

Remember that the Red wire with the white tracer stripe should always be hot with the key on. The TCI unit grounds the gray and orange wires from the ignition coils. The ignition coils fire when the TCI interrupts the ground.

The tricky part is the TCI un-grounds the gray and orange if there is no signal from the pick up coils for a few seconds. This is to protect the coils from overheating if the key is on and the engine isn't running. So unless you check the Red/white wire to gray (or orange) really quickly, you might get false readings or a mis-diagnosis of the true nature of the problem.


All of the XJ-series TCI units are of the "4RO" style as described in the above article.

Video here:

http://s307.beta.photobucket.com/us...4.html?&_suid=1354140627504033601775276167517


And if the above isn't enough, if you feel the need to get medieval with your TCI unit, well, then it doesn't get much better than this:

http://www.jetav8r.com/Vision/IgnitionFAQ.html

and this:

http://xjbikes.com/forums/threads/old-yamaha-diodes.32519


And for those who just can't resist a good Resistor (or transistor), here you go:

http://xjbikes.com/forums/index.php?threads/37190

and Holy Dark Mother of Fibre, don't try this at home kids!:

http://xjbikes.com/forums/index.php?threads/38234


One of the peculiarities of the TCI is the need to have at least one ground path for each secondary coil winding when checking for spark, or the TCI could (more like will) be damaged. For that reason you should never have more than one spark plug wire disconnected at any one time while cranking, and check for spark one plug at a time by grounding the plug to the head.

In a situation where you would want all plugs out…….for example, compression testing of the engine……then it is recommended that the TCI be unplugged from the main harness before testing is undertaken.


By the way, the TCI needs a minimum of about 10VDC to operate......and while the starter will spin the engine over like mad with low voltage, the TCI falls on its face at less than 10 volts.....which can lead to all sorts of confusion when a battery low-voltage condition occurs!




TCI Case Hardware:

Some TCI units have removable case covers to allow internal inspection of the circuit board. Over time these screws can get pretty foul-looking; if you want to restore the appearance of your unit, these (along with the replacement decal) will give your old unit and nice, "like-new" appearance. NOTE: not all TCI units had removable faceplates; it seems that sometime in the mid-80's, TCI units were produced with electronically welded cases, and not dis-assembly is possible (or at least "easy").


HCP6111 OEM tci case self-tapping SCREW. Used to hold the TCI case cover to the main body of the case. Use 4 per TCI on all XJ550, FJ600, XJ650RJ Seca, XJ750, and XJ900 models. These screws have a black finish as original. Each:
$ 1.95

HCP6111SET4 OEM tci case self-tapping SCREWS, set of 4:
$ 7.75


HCP28331 Aftermarket tci case self-tapping SCREW. Used to hold the TCI case cover to the main body of the case. Use 4 per TCI on all XJ550, FJ600, XJ650RJ Seca, XJ750, and XJ900 models. These screws are made from 18/8 stainless steel and have a bright finish. Each:
$ 1.25

HCP28331SET4 OEM tci case self-tapping SCREWS, set of 4:
$ 4.95



HCP28329 Aftermarket tci case self-tapping SCREW. Used to hold the TCI case cover to the main body of the case. Use 4 per TCI on all 1980-81 XJ650 Maxim and Midnight Maxim models (with the black label that reads 4H7-10, Type TID14-02). These screws are made from 4140 stainless steel and have a bright finish. Each:
$ 1.25

HCP28329SET4 OEM tci case self-tapping SCREWS, set of 4:
$ 4.95



HCP28327 Aftermarket tci case self-tapping SCREW. Used to hold the TCI case cover to the main body of the case. Use 4 per TCI on all XJ650 Turbo models. These screws are made from 410 stainless steel and have a bright finish. Each:
$ 1.25

HCP28327SET4 OEM tci case self-tapping SCREWS, set of 4:
$ 4.95



HCP6113 OEM tci case self-tapping SCREW. Used to hold the TCI case cover to the main body of the case. Use 6 per TCI on all XJ1100 models. These screws have a bright finish as original. Each:
$ 1.95

HCP6113SET6 OEM tci case self-tapping SCREWS, set of 6:
$ 9.95


HCP28333 Aftermarket tci case self-tapping SCREW. Used to hold the TCI case cover to the main body of the case. Use 6 per TCI on all XJ1100 models. These screws have a bright finish as original. Each:
$ 1.95

HCP28333SET6 Aftermarket tci case self-tapping SCREWS, set of 6:
$ 9.95



TCI Mounting Hardware:

er5) All of the little SCREWS, WASHERS, & NUTS needed to properly mount the TCI units to their foundation.

HCP314 OEM TCI - Igniter Unit mounting SCREW, user 2 per unit. For all XJ550 and FJ600 models. Zinc-plated alloy steel, panhead, phillips-drive Each:
$ 3.95

HCP5335 OEM TCI - Igniter Unit mounting SCREW, user 2 per unit. For all XJ550 and FJ600 models. Black alloy steel, panhead, phillips-drive. Each:
$ 2.95

HCP915 Aftermarket TCI - Igniter Unit mounting SCREW, user 2 per unit. For all XJ550 and FJ600 models. Zinc-plated alloy steel, panhead, phillips-drive Each:
$ 1.95

HCP316 Aftermarket TCI - Igniter Unit mounting SCREW, user 2 per unit. For all XJ550 and FJ600 models. 18-8 stainless steel, panhead, phillips-drive. Each:
$ 1.95

HCP317 Aftermarket TCI - Igniter Unit mounting SCREW, user 2 per unit. For all XJ550 and FJ600 models. 18-8 stainless steel with a polished button head, hex-drive. Each:
$ 2.50

HCP318 Aftermarket TCI - Igniter Unit mounting SCREW, user 2 per unit. For all XJ550 and FJ600 models. 18-8 stainless steel with a smooth, polished socket head, hex-drive. Each:
$ 2.50

HCP320 Aftermarket TCI - Igniter Unit mounting SCREW, user 2 per unit. For all XJ550 and FJ600 models. Black-oxide coated alloy steel with a ribbed socket head. Each:
$ 1.95



HCP1030 OEM TCI - Igniter Unit mounting SCREW, dark finish alloy steel, panhead, phillips drive. Use 2 per unit. For all XJ650 models, all XJ700 models, all XJ750 models, and all XJ900RK, RL, N/FN, and F models. Each:
$ 1.95

HCP2922 Aftermarket TCI - Igniter Unit mounting SCREW, use 2 per unit. For all XJ650 models, all XJ700 models, all XJ750 models, and all XJ900RK, RL, N/FN, and F models. Zinc-plated alloy steel, natural finish, panhead phillips-drive, each:
$ 1.50

HCP21362 Aftermarket TCI - Igniter Unit mounting SCREW, use 2 per unit. For all XJ650 models, all XJ700 models, all XJ750 models, and all XJ900RK, RL, N/FN, and F models. 18/8 stainless steel, bright finish, panhead phillips-drive, each:
$ 1.50

HCP6714 Aftermarket TCI - Igniter Unit mounting SCREW, use 2 per unit. For all XJ650 models, all XJ700 models, all XJ750 models, and all XJ900RK, RL, N/FN, and F models. Button head hex-drive, 18-8 stainless steel, bright finish, each:
$ 1.50

HCP6715 Aftermarket TCI - Igniter Unit mounting SCREW, use 2 per unit. For all XJ650 models, all XJ700 models, all XJ750 models, and all XJ900RK, RL, N/FN, and F models. Socket head, hex-drive, black-oxide coated alloy steel, each:
$ 1.75

HCP6716 Aftermarket TCI - Igniter Unit mounting SCREW, use 2 per unit. For all XJ650 models, all XJ700 models, all XJ750 models, and all XJ900RK, RL, N/FN, and F models. Socket head, hex-drive, 18-8 stainless steel, bright finish, each:
$ 1.95



HCP3860 OEM TCI - Igniter Unit mounting SCREW, user 2 per unit. For all XJ1100 models. Each:
$ 1.50



HCP315 OEM TCI - Igniter mounting LOCK WASHER, use 2 per unit. Fits all FJ600, XJ650, XJ750, XJ900RK, RL, N/FN, and F models, and XJ1100 models. Each:
$ 2.95

HCP916 Aftermarket zinc-plated alloy steel with a natural finish, TCI - Igniter mounting LOCK WASHER, use 2 per unit. Fits all XJ650, XJ750, XJ900RK, RL, N/FN, and F models, and XJ1100 models. Each:
$ 1.25

HCP319 Aftermarket 18-8 stainless steel TCI - Igniter mounting LOCK WASHER, use 2 per unit. Fits all XJ650, XJ750, XJ900RK, RL, N/FN, and F models, and XJ1100 models. Each:
$ 1.50

HCP321 Aftermarket black oxide-coated alloy steel TCI - Igniter mounting LOCK WASHER, use 2 per unit. Fits all XJ650, XJ750, XJ900RK, RL, N/FN, and F models, and XJ1100 models. Each:
$ 1.75



HCP2173 OEM TCI - Igniter mounting FLAT WASHER, use 2 per unit. Fits all XJ550, FJ600, XJ650 except 1983 XJ650 Turbo, XJ700, XJ750, and all XJ900RK, RL, N/FN, and F models, original bright finish, each:
$ 1.95

HCP6642 Aftermarket TCI - Igniter mounting FLAT WASHER, zinc-plated alloy steel with a natural finish, use 2 per unit. Fits all XJ550, FJ600, XJ650 except 1983 XJ650 Turbo, XJ700, XJ750, and all XJ900RK, RL, N/FN, and F models, each:
$ 0.95

HCP6643 Aftermarket TCI - Igniter mounting FLAT WASHER, 18-8 stainless steel with a natural finish, use 2 per unit. Fits all XJ550, FJ600, XJ650 except 1983 XJ650 Turbo, XJ700, XJ750, and all XJ900RK, RL, N/FN, and F models, each:
$ 1.25

HCP25756 Aftermarket TCI - Igniter mounting FLAT WASHER, 316 stainless steel with a natural finish, use 2 per unit. Fits all XJ550, FJ600, XJ650 except 1983 XJ650 Turbo, XJ700, XJ750, and all XJ900RK, RL, N/FN, and F models, each:
$ 1.95

HCP14285 Aftermarket TCI - Igniter mounting FLAT WASHER, black oxide-coated 18-8 stainless steel, use 2 per unit. Fits all XJ550, FJ600, XJ650 except 1983 XJ650 Turbo, XJ700, XJ750, and all XJ900RK, RL, N/FN, and F models, each:
$ 1.95

HCP14284 Aftermarket TCI - Igniter mounting FLAT WASHER, black oxide-coated hardened alloy steel, use 2 per unit. Fits all XJ550, FJ600, XJ650 except 1983 XJ650 Turbo, XJ700, XJ750, and all XJ900RK, RL, N/FN, and F models, each:
$ 2.95



HCP4248 OEM TCI - Igniter mounting FLAT WASHER, bright zinc-plated alloy steel, use 2 per unit. Fits all 1983 XJ650 Turbo models. Each:
$ 2.95

HCP25871 Aftermarket TCI - Igniter mounting FLAT WASHER, bright zinc-plated alloy steel, use 2 per unit. Fits all 1983 XJ650 Turbo models. Each:
$ 1.50


HCP1903 OEM TCI - Igniter mounting FLAT WASHER, black oxide-coated alloy steel, use 2 per unit. Fits all XJ1100 models, front side of the TCI. Each:
$ 3.95

HCP25872 Aftermarket TCI - Igniter mounting FLAT WASHER, bright zinc-plated alloy steel, use 2 per unit. Fits all XJ1100 models, front side of the TCI. Each:
$ 1.25

HCP25873 Aftermarket TCI - Igniter mounting FLAT WASHER, bright 18/8 stainless steel, use 2 per unit. Fits all XJ1100 models, front side of the TCI. Each:
$ 1.75

HCP25875 Aftermarket TCI - Igniter mounting FLAT WASHER, black oxide-coated 18/8 stainless steel, use 2 per unit. Fits all XJ1100 models, front side of the TCI. Each:
$ 1.95

HCP25874 Aftermarket TCI - Igniter mounting FLAT WASHER, bright 316 stainless steel, use 2 per unit. Fits all XJ1100 models, front side of the TCI. Each:
$ 2.95



HCP3575 OEM TCI - Igniter mounting FLAT WASHER, use 2 per unit. Fits all XJ1100 models, rear side of the TCI. Each:
$ 1.95


HCP3996 OEM TCI - Igniter mounting NUT, alloy steel with a bright zinc-plated finish. Use 2 per unit. Fits all XJ650 (except Turbo) models, all XJ700 models, and all XJ750 models. Each:
$ 2.95

HCP16570 Aftermarket TCI - Igniter mounting NUT, 18/8 stainless steel with a bright zinc-plated finish. Use 2 per unit. Fits all XJ650 (except Turbo) models, all XJ700 models, and all XJ750 models. Each:
$ 1.95


HCP4247 OEM TCI - Igniter mounting NUT PLATE, use 2 per unit. Fits all XJ550, XJ650 Turbo, and all XJ900RK, RL, N/FN, and F models. Each:
$ discontinued



TCI (Igniter) Case ID Decals:

HCP8107 Aftermarket TCI case ID DECAL, blue foil decal with TID14-05, 4U8-10 wording. Used on all XJ550 model TCI (igniter) boxes. NOTE: the silver "date code" box is left blank/unstamped.
$ 9.95

HCP8108 Aftermarket TCI case ID DECAL, black foil decal with TID14-02, 4H7-10 wording. Used on all 1980-81 XJ650 Maxim and Midnight Maxim model TCI (igniter) boxes. NOTE: the silver "date code" box is left blank/unstamped.
$ 9.95

HCP8109 Aftermarket TCI case ID DECAL, green foil decal with TID14-08, 5V2-10 wording. Used on all 1982 XJ650RJ Seca model TCI (igniter) boxes. NOTE: the silver "date code" box is left blank/unstamped.
$ 9.95

HCP8111 Aftermarket TCI case ID DECAL, black foil decal with TID14-13, 16G-10 wording. Used on all 1982-83 XJ650 Turbo model TCI (igniter) boxes. NOTE: the silver "date code" box is left blank/unstamped.
$ 9.95

HCP8110 Aftermarket TCI case ID DECAL, red foil decal with TID14-06, 5G2-10 wording. Used on all 1982-83 XJ650 Maxim and 1981-83 XJ750 models TCI (igniter) boxes. NOTE: the silver "date code" box is left blank/unstamped.
$ 9.95

HCP8112 Aftermarket TCI case ID DECAL, red foil decal with TID14-44, 1FG-10 wording. Used on all 1985-86 XJ700 air-cooled model TCI (igniter) boxes. NOTE: the silver "date code" box is left blank/unstamped.
$ 9.95

HCP8113 Aftermarket TCI case ID DECAL, yellow foil decal with TID14-35, 1AA-10 wording. Used on all 1985-86 XJ700-X water-cooled model TCI (igniter) boxes. NOTE: the silver "date code" box is left blank/unstamped.
$ 9.95

HCP8114 Aftermarket TCI case ID DECAL, black foil decal with TID14-19, 31A-10 wording. Used on all 1983-84 XJ900RK and RL model TCI (igniter) boxes. NOTE: the silver "date code" box is left blank/unstamped.
$ 9.95

HCP8115 Aftermarket TCI case ID DECAL, black foil decal with TID14-10, 10M-10 wording. Used on all 1982-84 XJ1100 Maxim and Midnight Maxim model TCI (igniter) boxes. NOTE: the silver "date code" box is left blank/unstamped.
$ 9.95




IGNITION COILS AND RELATED:

OEM and aftermarket IGNITION COILS replace damaged, cracked, or out-of-spec originals to help "light that XJ fire" under your...well, you know. Twenty-plus year old original coils can suffer from a variety of ailments that prevent them from doing their job, including burned or shorted internal windings, hairline cracks in the outer cases, or damaged and destroyed plug wire leads.

NOTE: although all of the following is repeated below under the spark plug Caps section, it would be good to review it here, also. ALWAYS TEST YOUR COILS (as described below) BEFORE ASSUMING THEY ARE THE PROBLEM. AND ALWAYS TEST YOUR COILS IF YOU ARE HAVING MIS-FIRING, FOULED PLUGS, OR OTHER (POSSIBLY) IGNITION-RELATED ENGINE PERFORMANCE PROBLEMS.

This will save you an incredible amount of time, effort, and $$$ and give you more quality riding time as opposed to a greater quantity of diagnostic time!


And a final note: using hi-performance, aftermarket coils (like Dyna or Accel brand) will generally NOT "improve the performance" of your bike in any measurable, meaningful way if your factory coils are performing okay. But if your factory system (coils, plug wires, and plug caps) are not up to snuff, then certainly ANY replacement (stock or aftermarket) coils are going to eliminate such problems and "improve performance". Be aware, though, that aftermarket coils can take quite a bit of mounting bracket fabrication efforts to make them fit properly into these cramped XJ frames, and you will have to purchase the plug wires, boots, and caps separately also.



Checking Factory Coils:

Factory Yamaha coils need to "see" a total load resistance on the secondary side (the "going-to-the-plugs" side of the coil) of around 20-30K ohms (ohms being a measure of electrical resistance). Electrical resistance depends on a number of factors: wire size, type of material, length of material, ambient temperature, etc. etc. All readings are specified at 70-F.

In any case, all factory XJ coils and wires combined---BUT WITHOUT THE CAPS OR PLUGS ATTACHED---have the following primary and secondary resistance ranges.

Forget watching any other video on u-tube, etc. about how to test dual-lead ignition coils; this is the only one that shows how to properly test both the primary circuit (from the wire harness) and the secondary circuit (the "plug wires" side of the coil).......with the spark plug caps removed. You can ignore the actual readings that he is showing....the specs for XJ bikes are shown below.....but the method that he shows for testing the secondary circuit is the correct procedure:

www.youtube.com/watch?v=I0TKybs6Rnw
(skip to 3:55 for the dual-lead coil)

or you can read all about it here:

www.xjbikes.com/forums/threads/how-to-test-ignition-coils-and-plug-caps.130696



For all XJ models except XJ700, XJ750-X, and XJ900 models:

Primary (input from TCI): 2.5 ohms +/- 10%
= 2.25 ohms - 2.75 ohms acceptable range

Secondary (output to spark plugs): 11K ohms +/- 20%
= 8,800 ohms - 13,200 ohms acceptable range


For all XJ700 and XJ750-X models:

Primary (input from TCI): 2.7 ohms +/- 10%
= 2.43 ohms - 2.97 ohms acceptable range

Secondary (output to spark plugs): 12K ohms +/- 20%
= 9,600 ohms - 14,400 ohms acceptable range


For all XJ900RK, RL, N, FN, and F models:

Primary (input from TCI): 2.7 ohms +/- 10%
= 2.43 ohms - 2.97 ohms acceptable range

Secondary (output to spark plugs): 13.2K ohms +/- 20%
= 10,560 ohms - 15,840 ohms acceptable range


For all XS1100 models:

Primary (input from TCI): 1.5 ohms +/- 10%
= 1.35 ohms -1.85 ohms acceptable range

Secondary (output to spark plugs): 15K ohms +/- 20%
= 12,000 ohms - 18,000 ohms acceptable range


All models:

Voltage at coil positive input terminal (the red wire with the white tracer stripe) with the engine running: 12+V This measurement should be taken at the back of the connector shell (stick the volt meter probe in thru the back of the connector) and the battery negative terminal. Compare this reading with the measured battery voltage (voltmeter connected between the battery negative and the battery positive terminals). Any significant difference or lack of voltage indicates corroded or broken connections in-between the fusebox and the ignition coils, and reduced voltage at the coil input will result in reduced coil output (at the spark plugs). Although reduced voltage input (and thus less coil output voltage) may not significantly affect engine performance once the engine is warmed up, it can and will result in "hard start" situations when the engine is cold and/or when the choke system is engaged (since richer fuel mixtures require a much stronger spark to create ignition of the fuel mixture).



In order to help diagnosing engine performance problems that seem to be "plug-related", always measure the resistance of your coils, both primary and secondary sides, as well as the voltage at the coil input (primary) "hot lead" (the red/white stripe wire) before you start replacing parts. 20+ year old coils can and do fail regularly. If you need to replace your coils, and decide to buy used, original coils "sight unseen", always make sure that the seller checks them for you before you buy them!

MANY 25+ YEAR OLD COILS ARE NOW OUT OF ELECTRICAL SPEC---so "buyer-beware" is the name of the game. And also note: most analog ("swinging needle") ohm meters require that the needle be "zeroed" manually before you check ohms each and every time! Digital ohm meters are usually self-zeroing.

Factory coils can also suffer from tiny hairline cracks in their outer plastic housings, leading to electrical shorts which might only show up when the coils get hot, or when the ambient air has quite a bit of moisture (humidity) in it. Running your bike at night, with the tank off, in a VERY dark area will allow you to visually see if there are any tiny blue sparks occurring around the coils or lead wires, in which case the coils are in need of replacement.

The spark plug WIRES on factory coils are sorta non-replaceable, at least not without a bit of precision surgery:

http://xjbikes.com/forums/index.php?threads/11221

Suffice it to say that if your coils measure out of specs for resistance (as described above), they're junk and should be replaced, either with another factory coil or a pair of the various aftermarket coils that are on the market (Dyna and Accel coils work, but are a challenge to mount correctly in these tight XJ frames). We do offer an NGK plug wire in-line splicer (HCP2789 listed further below) that will allow you to cut off and remove a bad factory wire and replace it with a length of aftermarket plug wire. Aftermarket 7mm stranded copper core plug wire is a good choice to use when replacing factory coil wires, as copper wire (in the lengths that are used on bikes) basically offer an amount of electrical resistance equal to zero, just like the stranded stainless steel core plug wires used originally.

NOTE:

* on the primary side of the coils, the proper colored leads from the TCI must be hooked up to the proper coil......see below. However, it does not matter which of these two wires go to either position on the coils.

- the ignition coil for the #1/#4 spark plugs is mounted on the left side of the bike, and has the solid orange (ground) wire and the red-with-white-tracer-stripe (hot) wire input leading to it.

- the ignition coil for the #2/#3 spark plugs is mounted on the right side of the bike, and has the solid grey (ground) wire and the red-with-white-tracer-stripe (hot) wire input leading to it.

- thus, for the #1/#4 coil, you must use the wiring lead from the main harness (TCI) that has the has the solid orange (ground) wire and the red-with-white-tracer-stripe (hot) wires, as these wires carry the timing trigger pulse to fire the #1/#4 plugs. However, it does not matter whether the orange wire is installed to the top input terminal of the #1/#4 coil, or to its bottom input terminal. In other words, there is no "polarity" to a coil's primary circuit.

- also, on the secondary (output, spark plug lead wires) it also does not matter which plug wire goes to which cylinder (because they actually both fire at the same time). Thus, for the #1/#4 coil, you can hook either plug wire lead to the #1 or the #4 cylinder.


Warning about coils and spark plug "testing":

From one of the true technical experts, Dwayne Verhey:

"Avoid disconnecting just one spark plug and cranking the engine, as this procedure can create permanent damage to a coil, as this procedure create a very high resistance in the entire secondary circuit of a coil. Voltage will rise inside the coil without a path for escape. Eventually it rises high enough to exceed the break-down voltage of the insulation within the coil, and then current will flow via this newly created path. In the process, it creates a "channel" or weak point through which the insulation value is reduced. Every time this occurs, the insulation value at that point is further reduced, until it drops to the air gap value of the distance between the two internal conductors.

So long as this internal resistance is greater than the resistance of the spark plug gap, the coil will continue to function when the spark plug is reconnected. Bear in mind that the resistance of the spark plug gap increases when the gap is subjected to compression -- known as "spark quench" -- so the plug may still demonstrate a spark outside of the engine, but not inside, leaving one with the mistaken impression that the coil is fully functional. If the internal damage is severe enough of course, then we say the coil has failed and search for a replacement.

The truth is that the coil didn't fail, it was destroyed by cranking or running the bike with one plug disconnected.


Additionally, one of the peculiarities of the TCI is the need to have at least one ground path for each secondary coil winding when checking for spark, or the TCI could (more like will) be damaged. For that reason you should never have more than one spark plug wire disconnected at any one time while cranking, and check for spark one plug at a time by grounding the plug to the head.

In a situation where you would want all plugs out…….for example, compression testing of the engine……then it is recommended that the TCI be unplugged from the main harness before testing is undertaken.


Fouled plugs are a different matter. Why do fouled plugs fail to spark? Because the carbon build-up on the plug electrodes is a conductor and the thus short-circuits the spark plug gap. Same with flooded plugs. Gasoline is also a conductor. So in these situation, we have not increased the resistance, we have actually lowered it, and therefore there is no great voltage build-up inside the coil to cause damage."

An exceptional write-up in regards to the entire ignition system can be reviewed at:

http://www.xjbikes.com/forums/index.php?threads/how-to-ignition-troubleshooting.21932



ic2) OEM and aftermarket STANDARD-OUTPUT IGNITION COILS. NOTE: original coils were either for the #1/#4 cylinders or the #2/#3 cylinders, and differed ONLY in the length of the spark plug wire leads on each coil (the #2/#3 coil used slightly shorter length plug wires). The current replacement OEM coils have the same length plug wire leads for both cylinders, but fit and work just like originals. The coil for the #1/4 spark plugs is mounted on the left side of the bike and has the solid orange (ground) wire and the red-with-white-tracer-stripe (hot) wire input leading to it, and the coil for the #2/3 spark plugs is mounted on the right side of the bike and has the solid grey (ground) wire and the red-with-white-tracer-stripe (hot) wire input leading to it.


XJ550 and 1986-90 YX600 models:

Coils without plug caps:

HCP420 OEM factory IGNITION COIL, fires either the #1/#4 or the #2/#3 cylinders. Fits all XJ550, 1986-90 YX600 Radian, all XJ650, XJ750 air-cooled models, XJ900RK, RL, N/FN, and F models, XJ1100, and all 1981 XS1100 models. NOTE: originally, there were two separate coils that differed only in the length of their spark plug lead wires (the left side #1/#4 coil had longer wires) and the color of the wire on the primary input. These HCP420 original coils are now only available in the "longer wire" version, and will work as either a #1/#4 coil or a #2/#3 coil. The coil bodies are a bit shorter than the originals, but the mounting points are the same, making them a bolt-on replacement. Electrical specs are as follows: 3.0 ohms on the primary side, and approximately 12.8K ohms on the secondary side. NOTE: the hard plastic resistive plug CAPS are not included and your original caps should be re-used or replacement caps ordered. Primary wire colors are solid orange and red/white tracer, which is correct for the #1/4 coil (left side), but of course it makes no difference in actual use or installation. Secondary (plug) wires are 7mm diameter, black. Use 2 coils per bike. Each:
$ 249.95

HCP420SET2 OEM factory IGNITION COILS set of 2.
$ 449.95



HCP26825 Aftermarket IGNITION COIL fits both the #1/#4 and #2/#3 cylinders. Fits all XJ550, 1986-90 YX600 Radian, XJ650, XJ750 air-cooled models, XJ900RK, RL, N/FN, and F models, XJ1100, and all 1981 XS1100 models. Correct fitment as the original factory coils, complete with black 7mm copper-core plug wires and primary lead-in harness with connector shell ---- plug-and-play! NOTE: the hard plastic resistive plug CAPS are not included and your original caps should be re-used or replacement caps ordered. Features the electrical specs as follows: 2.5 ohms on the primary side, and approximately 12K ohms on the secondary side (unlike most of the other aftermarket coils, which are actually designed for Honda or Kawasaki models, and have a much higher primary circuit resistance). NOTE: originally, there were two separate coils that differed only in the length of their spark plug lead wires (the #1/#4 coil had longer wires) and the color of the wire on the primary input. These reproduction coils are the "longer wire" version, and will thus work as either a #1/#4 coil or a #2/#3 coil (plug wires can be trimmed back, if desired, when used as the #2/3 right side coil). Primary wire colors are solid gray and red/white tracer, which is correct for the #2/3 coil (right side), but of course makes no difference in actual use or installation. Use 2 coils per bike. Each:
$ 59.95

HCP26825SET2 Aftermarket factory IGNITION COILS set of 2.
$ 109.95



HCP28641BLK Aftermarket IGNITION COILS SET. Fits all XJ550 and 1986-90 YX600 Radian models. These aftermarket coils will perfectly replace the original factory coils, and are complete with replaceable black 8mm copper-core plug wires and primary lead-in harness with connector shell ---- plug-and-play! NOTE: the hard plastic resistive plug CAPS are not included and your original caps should be re-used or replacement caps ordered. Features the electrical specs as follows: 2.4 ohms on the primary side, and approximately 12K ohms on the secondary side (unlike most of the other aftermarket coils, which are actually designed for Honda or Kawasaki models, and have a much higher primary circuit resistance). NOTE: these coils mount “rotated” compared to original coils, but present no fitment issues. Each set:
$ 129.95

HCP28641BLU Aftermarket IGNITION COILS SET. Fits all XJ550 and 1986-90 YX600 Radian models. These aftermarket coils will perfectly replace the original factory coils, and are complete with replaceable blue 8mm copper-core plug wires and primary lead-in harness with connector shell ---- plug-and-play! NOTE: the hard plastic resistive plug CAPS are not included and your original caps should be re-used or replacement caps ordered. Features the electrical specs as follows: 2.4 ohms on the primary side, and approximately 12K ohms on the secondary side (unlike most of the other aftermarket coils, which are actually designed for Honda or Kawasaki models, and have a much higher primary circuit resistance). NOTE: these coils mount “rotated” compared to original coils, but present no fitment issues. Each set:
$ 129.95

HCP28641YLW Aftermarket IGNITION COILS SET. Fits all XJ550 and 1986-90 YX600 Radian models. These aftermarket coils will perfectly replace the original factory coils, and are complete with replaceable yellow 8mm copper-core plug wires and primary lead-in harness with connector shell ---- plug-and-play! NOTE: the hard plastic resistive plug CAPS are not included and your original caps should be re-used or replacement caps ordered. Features the electrical specs as follows: 2.4 ohms on the primary side, and approximately 12K ohms on the secondary side (unlike most of the other aftermarket coils, which are actually designed for Honda or Kawasaki models, and have a much higher primary circuit resistance). NOTE: these coils mount “rotated” compared to original coils, but present no fitment issues. Each set:
$ 129.95

HCP28641RED Aftermarket IGNITION COILS SET. Fits all XJ550 and 1986-90 YX600 Radian models. These aftermarket coils will perfectly replace the original factory coils, and are complete with replaceable red 8mm copper-core plug wires and primary lead-in harness with connector shell ---- plug-and-play! NOTE: the hard plastic resistive plug CAPS are not included and your original caps should be re-used or replacement caps ordered. Features the electrical specs as follows: 2.4 ohms on the primary side, and approximately 12K ohms on the secondary side (unlike most of the other aftermarket coils, which are actually designed for Honda or Kawasaki models, and have a much higher primary circuit resistance). NOTE: these coils mount “rotated” compared to original coils, but present no fitment issues. Each set:
$ 129.95



Coil sets with plug caps:

HCP27692 OEM IGNITION COILS SET WITH PLUG CAPS fits both the #1/4 and #2/3 cylinders. Fits all XJ550 all models and 1986-90 YX600 Radian models. These factory coils feature black 7mm copper-core plug wires and primary lead-in harness with connector shell ----- so they are truly plug-and-play! NOTE: aftermarket NGK hard plastic resistive plug caps are included, as well as a set of 4 spark plug threaded terminal “stud nuts” (our part number HCP13158). These stud nuts are needed on most spark plugs used on these models to adapt correctly to the 10K ohm plug caps included with this set (if your spark plugs already have the smooth, hourglass-shaped stud nuts installed, then the included studs nuts can be saved as extras). Electrical specs are as follows: 3.0 ohms on the primary side, and approximately 12.8K ohms on the secondary side. NOTE: originally, there were two separate coils that differed only in the length of their spark plug lead wires (the #1/#4 coil had longer wires) and the color of the wire on the primary input. These coils are the "longer wire" version, and will thus work as either a #1/#4 coil or a #2/#3 coil (plug wires can be trimmed back, if desired, when used as the #2/3 right side coil. Primary wire colors are solid orange and red/white tracer, which is correct for the #1/4 coil (left side), but of course it makes no difference in actual use or installation. Each set has 2 coils, enough for 1 bike.
$ 469.95

HCP27675 Aftermarket IGNITION COILS SET WITH PLUG CAPS fits both the #1/4 and #2/3 cylinders. Fits all XJ550 all models and 1986-90 YX600 Radian models. Very similar profile to the original factory coils, complete with black 7mm copper-core plug wires and primary lead-in harness with connector shell ----- so they are truly plug-and-play! NOTE: aftermarket NGK hard plastic resistive plug caps are included, as well as a set of 4 spark plug threaded terminal “stud nuts” (our part number HCP13158). These stud nuts are needed on most spark plugs used on these models to adapt correctly to the 10K ohm plug caps included with this set (if your spark plugs already have the smooth, hourglass-shaped stud nuts installed, then the included studs nuts can be saved as extras). Features the electrical specs as follows: 2.5 ohms on the primary side, and approximately 12K ohms on the secondary side. NOTE: originally, there were two separate coils that differed only in the length of their spark plug lead wires (the #1/#4 coil had longer wires) and the color of the wire on the primary input. These aftermarket coils are the "longer wire" version, and will thus work as either a #1/#4 coil or a #2/#3 coil (plug wires can be trimmed back, if desired, when used as the #2/3 right side coil. Primary wire colors are solid gray and red/white tracer, which is correct for the #2/3 coil (right side), but of course makes no difference in actual use or installation. Each set has 2 coils, enough for 1 bike.
$ 149.95



HCP28642BLK Aftermarket IGNITION COILS SET WITH PLUG CAPS. Fits all XJ550 and 1986-90 YX600 Radian models. These aftermarket coils will perfectly replace the original factory coils, and are complete with replaceable black 8mm copper-core plug wires and primary lead-in harness with connector shell ---- plug-and-play! NOTE: the hard plastic resistive plug CAPS are included. Features the electrical specs as follows: 2.4 ohms on the primary side, and approximately 12K ohms on the secondary side (unlike most of the other aftermarket coils, which are actually designed for Honda or Kawasaki models, and have a much higher primary circuit resistance). NOTE: these coils mount “rotated” compared to original coils, but present no fitment issues. Each set:
$ 139.95

HCP28642BLU Aftermarket IGNITION COILS SET WITH PLUG CAPS. Fits all XJ550 and 1986-90 YX600 Radian models. These aftermarket coils will perfectly replace the original factory coils, and are complete with replaceable blue 8mm copper-core plug wires and primary lead-in harness with connector shell ---- plug-and-play! NOTE: the hard plastic resistive plug CAPS are included. Features the electrical specs as follows: 2.4 ohms on the primary side, and approximately 12K ohms on the secondary side (unlike most of the other aftermarket coils, which are actually designed for Honda or Kawasaki models, and have a much higher primary circuit resistance). NOTE: these coils mount “rotated” compared to original coils, but present no fitment issues. Each set:
$ 139.95

HCP28642YLW Aftermarket IGNITION COILS SET WITH PLUG CAPS. Fits all XJ550 and 1986-90 YX600 Radian models. These aftermarket coils will perfectly replace the original factory coils, and are complete with replaceable yellow 8mm copper-core plug wires and primary lead-in harness with connector shell ---- plug-and-play! NOTE: the hard plastic resistive plug CAPS are included. Features the electrical specs as follows: 2.4 ohms on the primary side, and approximately 12K ohms on the secondary side (unlike most of the other aftermarket coils, which are actually designed for Honda or Kawasaki models, and have a much higher primary circuit resistance). NOTE: these coils mount “rotated” compared to original coils, but present no fitment issues. Each set:
$ 139.95

HCP28642RED Aftermarket IGNITION COILS SET WITH PLUG CAPS. Fits all XJ550 and 1986-90 YX600 Radian models. These aftermarket coils will perfectly replace the original factory coils, and are complete with replaceable red 8mm copper-core plug wires and primary lead-in harness with connector shell ---- plug-and-play! NOTE: the hard plastic resistive plug CAPS are included. Features the electrical specs as follows: 2.4 ohms on the primary side, and approximately 12K ohms on the secondary side (unlike most of the other aftermarket coils, which are actually designed for Honda or Kawasaki models, and have a much higher primary circuit resistance). NOTE: these coils mount “rotated” compared to original coils, but present no fitment issues. Each set:
$ 139.95




1984-85 FJ600, 1986-88 FZ600, 1984-85 FJ1100, and 1986-87 FJ1200 models :

Coil sets without plug caps:

HCP421 OEM factory IGNITION COIL fits both the #1/#4 and #2/#3 cylinders. Fits all 1984-85 FJ600, 1986-88 FZ600, all XJ700 all models, 1985-86 XJ750-X water-cooled models, 1984-85 FJ1100, and 1986-87 FJ1200 models. NOTE: originally, there were two separate coils that differed only in the length of their spark plug lead wires (the #1/#4 coil had longer wires). These original coils are now only available in the "longer wire" version, and will work as either a #1/#4 coil or a #2/#3 coil. Features the electrical specs as follows: 2.9 ohms on the primary side, and approximately 13.3K ohms on the secondary side. NOTE: the hard plastic resistive plug CAPS are not included and your original caps should be re-used or replacement caps ordered. Primary wire colors are solid gray and red/white tracer, which is correct for the #1/4 coil (left side), but of course it makes no difference in actual use or installation. Use 2 coils per bike. Each:
$ 199.95

HCP421SET2 OEM factory IGNITION COILS set of 2.
$ 379.95




HCP24241SET Aftermarket IGNITION COILS SET fits both the #1/4 and #2/3 cylinders. Fits all 1984-85 FJ600, 1986-88 FZ600, 1984-85 FJ1100, and 1986-87 FJ1200 models. Very similar profile to the original factory coils, complete with black 7mm copper-core plug wires and primary lead-in harness with connector shell -----so they are truly plug-and-play! NOTE: the hard plastic resistive plug CAPS are not included and your original caps should be re-used or replacement caps ordered. Features the electrical specs as follows: 2.9 ohms on the primary side, and approximately 15K ohms on the secondary side. NOTE: originally, there were two separate coils that differed only in the length of their spark plug lead wires (the #1/#4 coil had longer wires) and the color of the wire on the primary input. These reproduction coils are the "longer wire" version, and will thus work as either a #1/#4 coil or a #2/#3 coil (plug wires can be trimmed back, if desired, when used as the #2/3 right side coil). Each set has 2 coils, enough for 1 bike.
$ 119.95



Coil sets with plug caps:

HCP27690 OEM IGNITION COILS SET WITH PLUG CAPS fits both the #1/4 and #2/3 cylinders. Fits all 1984-85 FJ600 and 1986-88 FZ600 models. These factory coils feature black 7mm copper-core plug wires and primary lead-in harness with connector shell ----- so they are truly plug-and-play! NOTE: aftermarket NGK hard plastic resistive plug caps are included, as well as a set of 4 spark plug threaded terminal “stud nuts” (our part number HCP13158). These stud nuts are needed on most spark plugs used on these models to adapt correctly to the 10K ohm plug caps included with this set (if your spark plugs already have the smooth, hourglass-shaped stud nuts installed, then the included studs nuts can be saved as extras). Features the electrical specs as follows: 2.9 ohms on the primary side, and approximately 13.3K ohms on the secondary side. NOTE: originally, there were two separate coils that differed only in the length of their spark plug lead wires (the #1/#4 coil had longer wires) and the color of the wire on the primary input. These coils are the "longer wire" version, and will thus work as either a #1/#4 coil or a #2/#3 coil (plug wires can be trimmed back, if desired, when used as the #2/3 right side coil. Primary wire colors are solid gray and red/white tracer, which is correct for the #1/4 coil (left side), but of course it makes no difference in actual use or installation. Each set has 2 coils, enough for 1 bike.
$ 399.95

HCP27671 Aftermarket IGNITION COILS SET WITH PLUG CAPS fits both the #1/4 and #2/3 cylinders. Fits all 1984-85 FJ600 and 1986-88 FZ600 models. Very similar profile to the original factory coils, complete with black 7mm copper-core plug wires and primary lead-in harness with connector shell -----so they are truly plug-and-play! NOTE: aftermarket NGK hard plastic resistive plug caps are included, as well as a set of 4 spark plug threaded terminal “stud nuts” (our part number HCP13158). These stud nuts are needed on most spark plugs used on these models to adapt correctly to the 10K ohm plug caps included with this set (if your spark plugs already have the smooth, hourglass-shaped stud nuts installed, then the included studs nuts can be saved as extras). Features the electrical specs as follows: 2.9 ohms on the primary side, and approximately 15K ohms on the secondary side. NOTE: originally, there were two separate coils that differed only in the length of their spark plug lead wires (the #1/#4 coil had longer wires) and the color of the wire on the primary input. These coils are the "longer wire" version, and will thus work as either a #1/#4 coil or a #2/#3 coil (plug wires can be trimmed back, if desired, when used as the #2/3 right side coil. Each set has 2 coils, enough for 1 bike.
$ 129.95




HCP27691 OEM IGNITION COILS SET WITH PLUG CAPS fits both the #1/4 and #2/3 cylinders. Fits all 1984-85 FJ1100, and 1986-87 FJ1200 models. These factory coils feature black 7mm copper-core plug wires and primary lead-in harness with connector shell ----- so they are truly plug-and-play! NOTE: aftermarket NGK hard plastic resistive plug caps are included, as well as a set of 4 spark plug threaded terminal “stud nuts” (our part number HCP13158). These stud nuts are needed on most spark plugs used on these models to adapt correctly to the 10K ohm plug caps included with this set (if your spark plugs already have the smooth, hourglass-shaped stud nuts installed, then the included studs nuts can be saved as extras). Features the electrical specs as follows: 2.9 ohms on the primary side, and approximately 13.3K ohms on the secondary side. NOTE: originally, there were two separate coils that differed only in the length of their spark plug lead wires (the #1/#4 coil had longer wires) and the color of the wire on the primary input. These coils are the "longer wire" version, and will thus work as either a #1/#4 coil or a #2/#3 coil (plug wires can be trimmed back, if desired, when used as the #2/3 right side coil. Primary wire colors are solid gray and red/white tracer, which is correct for the #1/4 coil (left side), but of course it makes no difference in actual use or installation. Each set has 2 coils, enough for 1 bike.
$ 399.95

HCP27672 Aftermarket IGNITION COILS SET WITH PLUG CAPS fits both the #1/4 and #2/3 cylinders. Fits all 1984-85 FJ1100, and 1986-87 FJ1200 models. Very similar profile to the original factory coils, complete with black 7mm copper-core plug wires and primary lead-in harness with connector shell -----so they are truly plug-and-play! NOTE: aftermarket NGK hard plastic resistive plug caps are included, as well as a set of 4 spark plug threaded terminal “stud nuts” (our part number HCP13158). These stud nuts are needed on most spark plugs used on these models to adapt correctly to the 10K ohm plug caps included with this set (if your spark plugs already have the smooth, hourglass-shaped stud nuts installed, then the included studs nuts can be saved as extras). Features the electrical specs as follows: 2.9 ohms on the primary side, and approximately 15K ohms on the secondary side. NOTE: originally, there were two separate coils that differed only in the length of their spark plug lead wires (the #1/#4 coil had longer wires) and the color of the wire on the primary input. These reproduction coils are the "longer wire" version, and will thus work as either a #1/#4 coil or a #2/#3 coil (plug wires can be trimmed back, if desired, when used as the #2/3 right side coil. Each set has 2 coils, enough for 1 bike.
$ 139.95




1992-98 XJ600 Seca II models :

Coil sets without plug caps:

HCP22652LH OEM factory IGNITION COIL for the left side (firing the #1 and #4 cylinders. NOTE: the hard plastic resistive plug CAPS are not included and your original caps should be re-used or replacement caps ordered. Features the electrical specs as follows: 2.5 ohms on the primary side, and approximately 11.6K ohms on the secondary side. Fits all 1992-98 XJ600 Seca II models. Each:
$ 79.95

HCP22652RH OEM factory IGNITION COIL for the right side (firing the #2 and #3 cylinders. NOTE: the hard plastic resistive plug CAPS are not included and your original caps should be re-used or replacement caps ordered. Features the electrical specs as follows: 2.5 ohms on the primary side, and approximately 11.6K ohms on the secondary side. Fits all 1992-98 XJ600 Seca II models. Each:
$ 79.95



Coil sets with plug caps:

HCP27702 OEM IGNITION COILS SET WITH PLUG CAPS fits both the #1/4 and #2/3 cylinders. Fits all 1992-98 XJ600 Seca II models. These factory coils feature black 7mm copper-core plug wires and primary lead-in harness with connector shell ----- so they are truly plug-and-play! NOTE: aftermarket NGK hard plastic resistive plug caps are included. Features the electrical specs as follows: 2.5 ohms on the primary side, and approximately 11.6K ohms on the secondary side. Each set has 2 coils, enough for 1 bike.
$ 189.95




XJ700 and XJ750-X:

Coil sets without plug caps:

HCP421 OEM factory IGNITION COIL fits both the #1/#4 and #2/#3 cylinders. Fits all 1984-85 FJ600, 1986-88 FZ600, all XJ700 all models, 1985-86 XJ750-X water-cooled models, 1984-85 FJ1100, and 1986-87 FJ1200 models. NOTE: originally, there were two separate coils that differed only in the length of their spark plug lead wires (the #1/#4 coil had longer wires). These original coils are now only available in the "longer wire" version, and will work as either a #1/#4 coil or a #2/#3 coil. Features the electrical specs as follows: 2.9 ohms on the primary side, and approximately 13.3K ohms on the secondary side. NOTE: the hard plastic resistive plug CAPS are not included and your original caps should be re-used or replacement caps ordered. Primary wire colors are solid gray and red/white tracer, which is correct for the #1/4 coil (left side), but of course it makes no difference in actual use or installation. Use 2 coils per bike. Each:
$ 199.95

HCP421SET2 OEM factory IGNITION COILS set of 2.
$ 379.95



HCP24270 Aftermarket IGNITION COILS SET fits both the #1/4 and #2/3 cylinders. Fits all XJ700 models and 1985-86 XJ750-X water-cooled models. Very similar profile to the original factory coils, complete with black 7mm copper-core plug wires and primary lead-in harness with connector shell -----so they are truly plug-and-play! NOTE: the hard plastic resistive plug CAPS are not included and your original caps should be re-used or replacement caps ordered. Features the electrical specs as follows: 2.9 ohms on the primary side, and approximately 15K ohms on the secondary side. NOTE: originally, there were two separate coils that differed only in the length of their spark plug lead wires (the #1/#4 coil had longer wires) and the color of the wire on the primary input. These reproduction coils are the "longer wire" version, and will thus work as either a #1/#4 coil or a #2/#3 coil (plug wires can be trimmed back, if desired, when used as the #2/3 right side coil). A set of spacers, new cover screws, and installation instructions are included to make a professional fitment possible. NOTE: the outer chromed-plastic coil covers will need to be slightly modified (on the bottom, where the plug wires exit the cover) to allow plug wire exit from the cover. This simple modification (i.e. a small file or a dremel tool, etc.) will not be outwardly visible once accomplished. NOTE: the spacers, cover screws, and install instructions are not needed for the water-cooled XJ750-X engines. Each set has 2 coils, enough for 1 bike.
$ 129.95



Coil sets with plug caps:

HCP27689 OEM IGNITION COILS SET WITH PLUG CAPS fits both the #1/4 and #2/3 cylinders. Fits all 1985-86 XJ700 air-cooled models. These factory coils feature black 7mm copper-core plug wires and primary lead-in harness with connector shell ----- so they are truly plug-and-play! NOTE: aftermarket NGK hard plastic resistive plug caps are included. Features the electrical specs as follows: 2.9 ohms on the primary side, and approximately 13.3K ohms on the secondary side. NOTE: originally, there were two separate coils that differed only in the length of their spark plug lead wires (the #1/#4 coil had longer wires) and the color of the wire on the primary input. These coils are the "longer wire" version, and will thus work as either a #1/#4 coil or a #2/#3 coil (plug wires can be trimmed back, if desired, when used as the #2/3 right side coil). Primary wire colors are solid gray and red/white tracer, which is correct for the #1/4 coil (left side), but of course it makes no difference in actual use or installation. Each set has 2 coils, enough for 1 bike.
$ 399.95

HCP27670 Aftermarket IGNITION COILS SET WITH PLUG CAPS fits both the #1/4 and #2/3 cylinders. Fits all 1985-86 XJ700 air-cooled models. Very similar profile to the original factory coils, complete with black 7mm copper-core plug wires and primary lead-in harness with connector shell -----so they are truly plug-and-play! NOTE: aftermarket NGK hard plastic resistive plug caps are included. Features the electrical specs as follows: 2.9 ohms on the primary side, and approximately 15K ohms on the secondary side. NOTE: originally, there were two separate coils that differed only in the length of their spark plug lead wires (the #1/#4 coil had longer wires) and the color of the wire on the primary input. These reproduction coils are the "longer wire" version, and will thus work as either a #1/#4 coil or a #2/#3 coil (plug wires can be trimmed back, if desired, when used as the #2/3 right side coil). A set of spacers, new cover screws, and installation instructions are included to make a professional fitment possible. NOTE: the outer chromed-plastic coil covers will need to be slightly modified (on the bottom, where the plug wires exit the cover) to allow plug wire exit from the cover. This simple modification (i.e. a small file or a dremel tool, etc.) will not be outwardly visible once accomplished. Each set has 2 coils, enough for 1 bike.
$ 139.95




XJ650, XJ750 air-cooled, and XJ900RK, RL, N/FN, and F models:

Coils without plug caps:

HCP420 OEM factory IGNITION COIL, fires either the #1/#4 or the #2/#3 cylinders. Fits all XJ550, 1986-90 YX600 Radian, all XJ650, XJ750 air-cooled models, XJ900RK, RL, N/FN, and F models, XJ1100, and all 1981 XS1100 models. NOTE: originally, there were two separate coils that differed only in the length of their spark plug lead wires (the left side #1/#4 coil had longer wires) and the color of the wire on the primary input. These HCP420 original coils are now only available in the "longer wire" version, and will work as either a #1/#4 coil or a #2/#3 coil. The coil bodies are a bit shorter than the originals, but the mounting points are the same, making them a bolt-on replacement. Electrical specs are as follows: 3.0 ohms on the primary side, and approximately 12.8K ohms on the secondary side. NOTE: the hard plastic resistive plug CAPS are not included and your original caps should be re-used or replacement caps ordered. Primary wire colors are solid orange and red/white tracer, which is correct for the #1/4 coil (left side), but of course it makes no difference in actual use or installation. Secondary (plug) wires are 7mm diameter, black. Use 2 coils per bike. Each:
$ 249.95

HCP420SET2 OEM factory IGNITION COILS set of 2.
$ 449.95



HCP26825 Aftermarket IGNITION COIL fits both the #1/#4 and #2/#3 cylinders. Fits all XJ550, 1986-90 YX600 Radian, XJ650, XJ750 air-cooled models, XJ900RK, RL, N/FN, and F models, XJ1100, and all 1981 XS1100 models. Correct fitment as the original factory coils, complete with black 7mm copper-core plug wires and primary lead-in harness with connector shell ---- plug-and-play! NOTE: the hard plastic resistive plug CAPS are not included and your original caps should be re-used or replacement caps ordered. Features the electrical specs as follows: 2.5 ohms on the primary side, and approximately 12K ohms on the secondary side (unlike most of the other aftermarket coils, which are actually designed for Honda or Kawasaki models, and have a much higher primary circuit resistance). NOTE: originally, there were two separate coils that differed only in the length of their spark plug lead wires (the #1/#4 coil had longer wires) and the color of the wire on the primary input. These reproduction coils are the "longer wire" version, and will thus work as either a #1/#4 coil or a #2/#3 coil (plug wires can be trimmed back, if desired, when used as the #2/3 right side coil). Primary wire colors are solid gray and red/white tracer, which is correct for the #2/3 coil (right side), but of course makes no difference in actual use or installation. Use 2 coils per bike. Each:
$ 59.95

HCP26825SET2 Aftermarket factory IGNITION COILS set of 2.
$ 109.95



HCP28644BLK Aftermarket IGNITION COILS SET. Fits all XJ650, all XJ750 air-cooled, all XJ900, XJ1100, and 1981 XS1100 models. These aftermarket coils will perfectly replace the original factory coils, and are complete with replaceable black 8mm copper-core plug wires and primary lead-in harness with connector shell ---- plug-and-play! NOTE: the hard plastic resistive plug CAPS are not included and your original caps should be re-used or replacement caps ordered. Features the electrical specs as follows: 2.4 ohms on the primary side, and approximately 12K ohms on the secondary side (unlike most of the other aftermarket coils, which are actually designed for Honda or Kawasaki models, and have a much higher primary circuit resistance). NOTE: these coils mount “rotated” compared to original coils, but present no fitment issues. Each set:
$ 129.95

HCP28644BLU Aftermarket IGNITION COILS SET. Fits all XJ650, all XJ750 air-cooled, all XJ900, XJ1100, and 1981 XS1100 models. These aftermarket coils will perfectly replace the original factory coils, and are complete with replaceable blue 8mm copper-core plug wires and primary lead-in harness with connector shell ---- plug-and-play! NOTE: the hard plastic resistive plug CAPS are not included and your original caps should be re-used or replacement caps ordered. Features the electrical specs as follows: 2.4 ohms on the primary side, and approximately 12K ohms on the secondary side (unlike most of the other aftermarket coils, which are actually designed for Honda or Kawasaki models, and have a much higher primary circuit resistance). NOTE: these coils mount “rotated” compared to original coils, but present no fitment issues. Each set:
$ 129.95

HCP28644YLW Aftermarket IGNITION COILS SET. Fits all XJ650, all XJ750 air-cooled, all XJ900, XJ1100, and 1981 XS1100 models. These aftermarket coils will perfectly replace the original factory coils, and are complete with replaceable yellow 8mm copper-core plug wires and primary lead-in harness with connector shell ---- plug-and-play! NOTE: the hard plastic resistive plug CAPS are not included and your original caps should be re-used or replacement caps ordered. Features the electrical specs as follows: 2.4 ohms on the primary side, and approximately 12K ohms on the secondary side (unlike most of the other aftermarket coils, which are actually designed for Honda or Kawasaki models, and have a much higher primary circuit resistance). NOTE: these coils mount “rotated” compared to original coils, but present no fitment issues. Each set:
$ 129.95

HCP28644RED Aftermarket IGNITION COILS SET. Fits all XJ650, all XJ750 air-cooled, all XJ900, XJ1100, and 1981 XS1100 models. These aftermarket coils will perfectly replace the original factory coils, and are complete with replaceable red 8mm copper-core plug wires and primary lead-in harness with connector shell ---- plug-and-play! NOTE: the hard plastic resistive plug CAPS are not included and your original caps should be re-used or replacement caps ordered. Features the electrical specs as follows: 2.4 ohms on the primary side, and approximately 12K ohms on the secondary side (unlike most of the other aftermarket coils, which are actually designed for Honda or Kawasaki models, and have a much higher primary circuit resistance). NOTE: these coils mount “rotated” compared to original coils, but present no fitment issues. Each set:
$ 129.95



Coil sets with plug caps:

HCP27693 OEM IGNITION COILS SET WITH PLUG CAPS fits both the #1/4 and #2/3 cylinders. Fits all XJ650 models, all XJ750 air-cooled models, and all XJ900RK, RL, F, N, and FN models. These factory coils feature black 7mm copper-core plug wires and primary lead-in harness with connector shell ----- so they are truly plug-and-play! NOTE: aftermarket NGK hard plastic resistive plug caps are included. Electrical specs are as follows: 3.0 ohms on the primary side, and approximately 12.8K ohms on the secondary side. NOTE: originally, there were two separate coils that differed only in the length of their spark plug lead wires (the #1/#4 coil had longer wires) and the color of the wire on the primary input. These coils are the "longer wire" version, and will thus work as either a #1/#4 coil or a #2/#3 coil (plug wires can be trimmed back, if desired, when used as the #2/3 right side coil). Primary wire colors are solid orange and red/white tracer, which is correct for the #1/4 coil (left side), but of course it makes no difference in actual use or installation. Each set has 2 coils, enough for 1 bike.
$ 399.95

HCP27676 Aftermarket IGNITION COILS SET WITH PLUG CAPS fits both the #1/4 and #2/3 cylinders. Fits all XJ650 models, all XJ750 air-cooled models, and all XJ900RK, RL, F, N, and FN models. Correct profile and fitment as the original factory coils, complete with black 7mm copper-core plug wires and primary lead-in harness with connector shell ----- so they are truly plug-and-play! NOTE: aftermarket NGK hard plastic resistive plug caps are included. Features the electrical specs as follows: 2.5 ohms on the primary side, and approximately 12K ohms on the secondary side. NOTE: originally, there were two separate coils that differed only in the length of their spark plug lead wires (the #1/#4 coil had longer wires) and the color of the wire on the primary input. These aftermarket coils are the "longer wire" version, and will thus work as either a #1/#4 coil or a #2/#3 coil (plug wires can be trimmed back, if desired, when used as the #2/3 right side coil). Primary wire colors are solid gray and red/white tracer, which is correct for the #2/3 coil (right side), but of course it makes no difference in actual use or installation. Each set has 2 coils, enough for 1 bike.
$ 134.95




HCP28645BLK Aftermarket IGNITION COILS SET WITH PLUG CAPS. Fits all XJ650 models, all XJ750 air-cooled models, and all XJ900 models. These aftermarket coils will perfectly replace the original factory coils, and are complete with replaceable black 8mm copper-core plug wires and primary lead-in harness with connector shell ---- plug-and-play! NOTE: the hard plastic resistive plug CAPS are included. Features the electrical specs as follows: 2.4 ohms on the primary side, and approximately 12K ohms on the secondary side (unlike most of the other aftermarket coils, which are actually designed for Honda or Kawasaki models, and have a much higher primary circuit resistance). NOTE: these coils mount “rotated” compared to original coils, but present no fitment issues. Each set:
$ 139.95

HCP28645BLU Aftermarket IGNITION COILS SET WITH PLUG CAPS. Fits all XJ650 models, all XJ750 air-cooled models, and all XJ900 models. These aftermarket coils will perfectly replace the original factory coils, and are complete with replaceable blue 8mm copper-core plug wires and primary lead-in harness with connector shell ---- plug-and-play! NOTE: the hard plastic resistive plug CAPS are included. Features the electrical specs as follows: 2.4 ohms on the primary side, and approximately 12K ohms on the secondary side (unlike most of the other aftermarket coils, which are actually designed for Honda or Kawasaki models, and have a much higher primary circuit resistance). NOTE: these coils mount “rotated” compared to original coils, but present no fitment issues. Each set:
$ 139.95

HCP28645YLW Aftermarket IGNITION COILS SET WITH PLUG CAPS. Fits all XJ650 models, all XJ750 air-cooled models, and all XJ900 models. These aftermarket coils will perfectly replace the original factory coils, and are complete with replaceable yellow 8mm copper-core plug wires and primary lead-in harness with connector shell ---- plug-and-play! NOTE: the hard plastic resistive plug CAPS are included. Features the electrical specs as follows: 2.4 ohms on the primary side, and approximately 12K ohms on the secondary side (unlike most of the other aftermarket coils, which are actually designed for Honda or Kawasaki models, and have a much higher primary circuit resistance). NOTE: these coils mount “rotated” compared to original coils, but present no fitment issues. Each set:
$ 139.95

HCP28645RED Aftermarket IGNITION COILS SET WITH PLUG CAPS. Fits all XJ650 models, all XJ750 air-cooled models, and all XJ900 models. These aftermarket coils will perfectly replace the original factory coils, and are complete with replaceable red 8mm copper-core plug wires and primary lead-in harness with connector shell ---- plug-and-play! NOTE: the hard plastic resistive plug CAPS are included. Features the electrical specs as follows: 2.4 ohms on the primary side, and approximately 12K ohms on the secondary side (unlike most of the other aftermarket coils, which are actually designed for Honda or Kawasaki models, and have a much higher primary circuit resistance). NOTE: these coils mount “rotated” compared to original coils, but present no fitment issues. Each set:
$ 139.95




1978-80 XS1100 models:

Coils without plug caps:

HCP27695 OEM factory IGNITION COILS SET, fires either the #1/#4 or the #2/#3 cylinders. Fits all 1978-80 XS1100 models. These factory coils feature black 7mm copper-core plug wires and primary lead-in harness with bullet terminals ---- so they are truly plug-and-play! NOTE: the hard plastic resistive plug CAPS are not included and your original caps should be re-used or replacement caps ordered. Electrical specs are as follows: 3.0 ohms on the primary side, and approximately 12.8K ohms on the secondary side. NOTE: originally, there were two separate coils that differed only in the length of their spark plug lead wires (the left side #1/#4 coil had longer wires) and the color of the wire on the primary input. These original coils are now only available in the "longer wire" version, and will work as either a #1/#4 coil or a #2/#3 coil. The coil bodies are a bit shorter than the originals, but the mounting points are the same, making them a bolt-on replacement. Primary wire colors are solid orange and red/white tracer, which is correct for the #1/4 coil (left side), but of course it makes no difference in actual use or installation. NOTE: the “ballast resistor” used on these models must be by-passed when using these coils, and instructions on how to do so are included. Also, a set of spacers are included to make a professional fitment possible. Each set has 2 coils, enough for 1 bike.
$ 469.95

HCP27032 Aftermarket IGNITION COILS SET fits both the #1/#4 and #2/#3 cylinders. Fits all 1978-80 XS1100 models. Correct profile and fitment as the original factory coils, complete with black 7mm copper-core plug wires and primary lead-in harness with bullet terminals ---- so they are truly plug-and-play! NOTE: the hard plastic resistive plug CAPS are not included and your original caps should be re-used or replacement caps ordered. Electrical specs as follows: 2.5 ohms on the primary side, and approximately 12K ohms on the secondary side. NOTE: originally, there were two separate coils that differed only in the length of their spark plug lead wires (the #1/#4 coil had longer wires) and the color of the wire on the primary input. These aftermarket coils are the "longer wire" version, and will thus work as either a #1/#4 coil or a #2/#3 coil (plug wires can be trimmed back, if desired, when used as the #2/3 right side coil). Primary wire colors are solid gray and red/white tracer, which is correct for the #2/3 coil (right side), but of course it makes no difference in actual use or installation. NOTE: the “ballast resistor” used on these models must be by-passed when using these coils, and instructions on how to do so are included. Also, a set of spacers are included to make a professional fitment possible. Each set has 2 coils, enough for 1 bike.
$ 139.95



HCP28647BLK Aftermarket IGNITION COILS SET. Fits all 1978-80 XS1100 models. These aftermarket coils will perfectly replace the original factory coils, and are complete with replaceable black 8mm copper-core plug wires and primary lead-in harness with connector shell ---- plug-and-play! NOTE: the hard plastic resistive plug CAPS are not included and your original caps should be re-used or replacement caps ordered. Features the electrical specs as follows: 2.4 ohms on the primary side, and approximately 12K ohms on the secondary side (unlike most of the other aftermarket coils, which are actually designed for Honda or Kawasaki models, and have a much higher primary circuit resistance). NOTE: these coils mount “rotated” compared to original coils, but present no fitment issues. Each set:
$ 129.95

HCP28647BLU Aftermarket IGNITION COILS SET. Fits all 1978-80 XS1100 models. These aftermarket coils will perfectly replace the original factory coils, and are complete with replaceable blue 8mm copper-core plug wires and primary lead-in harness with connector shell ---- plug-and-play! NOTE: the hard plastic resistive plug CAPS are not included and your original caps should be re-used or replacement caps ordered. Features the electrical specs as follows: 2.4 ohms on the primary side, and approximately 12K ohms on the secondary side (unlike most of the other aftermarket coils, which are actually designed for Honda or Kawasaki models, and have a much higher primary circuit resistance). NOTE: these coils mount “rotated” compared to original coils, but present no fitment issues. Each set:
$ 129.95

HCP28647YLW Aftermarket IGNITION COILS SET. Fits all 1978-80 XS1100 models. These aftermarket coils will perfectly replace the original factory coils, and are complete with replaceable yellow 8mm copper-core plug wires and primary lead-in harness with connector shell ---- plug-and-play! NOTE: the hard plastic resistive plug CAPS are not included and your original caps should be re-used or replacement caps ordered. Features the electrical specs as follows: 2.4 ohms on the primary side, and approximately 12K ohms on the secondary side (unlike most of the other aftermarket coils, which are actually designed for Honda or Kawasaki models, and have a much higher primary circuit resistance). NOTE: these coils mount “rotated” compared to original coils, but present no fitment issues. Each set:
$ 129.95

HCP28647RED Aftermarket IGNITION COILS SET. Fits all 1978-80 XS1100 models. These aftermarket coils will perfectly replace the original factory coils, and are complete with replaceable red 8mm copper-core plug wires and primary lead-in harness with connector shell ---- plug-and-play! NOTE: the hard plastic resistive plug CAPS are not included and your original caps should be re-used or replacement caps ordered. Features the electrical specs as follows: 2.4 ohms on the primary side, and approximately 12K ohms on the secondary side (unlike most of the other aftermarket coils, which are actually designed for Honda or Kawasaki models, and have a much higher primary circuit resistance). NOTE: these coils mount “rotated” compared to original coils, but present no fitment issues. Each set:
$ 129.95



Coil sets with plug caps:

HCP27697 OEM IGNITION COILS SET WITH PLUG CAPS fits both the #1/4 and #2/3 cylinders. Fits all 1978-80 XS1100 models. These factory coils feature black 7mm copper-core plug wires and primary lead-in harness with connector shell ----- so they are truly plug-and-play! NOTE: aftermarket NGK hard plastic resistive plug caps are included. Electrical specs are as follows: 3.0 ohms on the primary side, and approximately 12.8K ohms on the secondary side. NOTE: originally, there were two separate coils that differed only in the length of their spark plug lead wires (the #1/#4 coil had longer wires) and the color of the wire on the primary input. These coil coils are the "longer wire" version, and will thus work as either a #1/#4 coil or a #2/#3 coil (plug wires can be trimmed back, if desired, when used as the #2/3 right side coil). Primary wire colors are solid orange and red/white tracer, which is correct for the #1/4 coil (left side), but of course it makes no difference in actual use or installation. NOTE: the “ballast resistor” used on these models must be by-passed when using these coils, and instructions on how to do so are included. Also, a set of spacers are included to make a professional fitment possible. Each set has 2 coils, enough for 1 bike.
$ 449.95

HCP27678 Aftermarket IGNITION COILS SET WITH PLUG CAPS fits both the #1/4 and #2/3 cylinders. Fits all 1978-80 XS1100 models. Correct profile and fitment as the original factory coils, complete with black 7mm copper-core plug wires and primary lead-in harness with bullet terminals-----so they are truly plug-and-play! NOTE: aftermarket NGK hard plastic resistive plug caps are included. Features the electrical specs as follows: 2.5 ohms on the primary side, and approximately 12K ohms on the secondary side. NOTE: originally, there were two separate coils that differed only in the length of their spark plug lead wires (the #1/#4 coil had longer wires) and the color of the wire on the primary input. These HCP27678 reproduction coils are the "longer wire" version, and will thus work as either a #1/#4 coil or a #2/#3 coil (plug wires can be trimmed back, if desired, when used as the #2/3 right side coil). Primary wire colors are solid gray and red/white tracer, which is correct for the #2/3 coil (right side), but of course it makes no difference in actual use or installation. Fits all 1978-80 XS1100 models. NOTE: the “ballast resistor” used on these models must be by-passed when using these coils, and instructions on how to do so are included. Also, a set of spacers are included to make a professional fitment possible. Each set has 2 coils, enough for 1 bike.
$ 149.95



HCP28648BLK Aftermarket IGNITION COILS SET WITH PLUG CAPS. Fits all 1978-80 XS1100 models. These aftermarket coils will perfectly replace the original factory coils, and are complete with replaceable black 8mm copper-core plug wires and primary lead-in harness with connector shell ---- plug-and-play! NOTE: the hard plastic resistive plug CAPS are included. Features the electrical specs as follows: 2.4 ohms on the primary side, and approximately 12K ohms on the secondary side (unlike most of the other aftermarket coils, which are actually designed for Honda or Kawasaki models, and have a much higher primary circuit resistance). NOTE: these coils mount “rotated” compared to original coils, but present no fitment issues. Each set:
$ 139.95

HCP28648BLU Aftermarket IGNITION COILS SET WITH PLUG CAPS. Fits all 1978-80 XS1100 models. These aftermarket coils will perfectly replace the original factory coils, and are complete with replaceable blue 8mm copper-core plug wires and primary lead-in harness with connector shell ---- plug-and-play! NOTE: the hard plastic resistive plug CAPS are included. Features the electrical specs as follows: 2.4 ohms on the primary side, and approximately 12K ohms on the secondary side (unlike most of the other aftermarket coils, which are actually designed for Honda or Kawasaki models, and have a much higher primary circuit resistance). NOTE: these coils mount “rotated” compared to original coils, but present no fitment issues. Each set:
$ 139.95

HCP28648YLW Aftermarket IGNITION COILS SET WITH PLUG CAPS. Fits all 1978-80 XS1100 models. These aftermarket coils will perfectly replace the original factory coils, and are complete with replaceable yellow 8mm copper-core plug wires and primary lead-in harness with connector shell ---- plug-and-play! NOTE: the hard plastic resistive plug CAPS are included. Features the electrical specs as follows: 2.4 ohms on the primary side, and approximately 12K ohms on the secondary side (unlike most of the other aftermarket coils, which are actually designed for Honda or Kawasaki models, and have a much higher primary circuit resistance). NOTE: these coils mount “rotated” compared to original coils, but present no fitment issues. Each set:
$ 139.95

HCP28648RED Aftermarket IGNITION COILS SET WITH PLUG CAPS. Fits all 1978-80 XS1100 models. These aftermarket coils will perfectly replace the original factory coils, and are complete with replaceable red 8mm copper-core plug wires and primary lead-in harness with connector shell ---- plug-and-play! NOTE: the hard plastic resistive plug CAPS are included. Features the electrical specs as follows: 2.4 ohms on the primary side, and approximately 12K ohms on the secondary side (unlike most of the other aftermarket coils, which are actually designed for Honda or Kawasaki models, and have a much higher primary circuit resistance). NOTE: these coils mount “rotated” compared to original coils, but present no fitment issues. Each set:
$ 139.95




XJ1100 and 1981 XS1100 models:

Coils without plug caps:

HCP420 OEM factory IGNITION COIL, fires either the #1/#4 or the #2/#3 cylinders. Fits all XJ550, 1986-90 YX600 Radian, all XJ650, XJ750 air-cooled models, XJ900RK, RL, N/FN, and F models, XJ1100, and all 1981 XS1100 models. NOTE: originally, there were two separate coils that differed only in the length of their spark plug lead wires (the left side #1/#4 coil had longer wires) and the color of the wire on the primary input. These HCP420 original coils are now only available in the "longer wire" version, and will work as either a #1/#4 coil or a #2/#3 coil. The coil bodies are a bit shorter than the originals, but the mounting points are the same, making them a bolt-on replacement. Electrical specs are as follows: 3.0 ohms on the primary side, and approximately 12.8K ohms on the secondary side. NOTE: the hard plastic resistive plug CAPS are not included and your original caps should be re-used or replacement caps ordered. Primary wire colors are solid orange and red/white tracer, which is correct for the #1/4 coil (left side), but of course it makes no difference in actual use or installation. Secondary (plug) wires are 7mm diameter, black. Use 2 coils per bike. Each:
$ 249.95

HCP420SET2 OEM factory IGNITION COILS set of 2.
$ 449.95



HCP26825 Aftermarket IGNITION COIL fits both the #1/#4 and #2/#3 cylinders. Fits all XJ550, 1986-90 YX600 Radian, XJ650, XJ750 air-cooled models, XJ900RK, RL, N/FN, and F models, XJ1100, and all 1981 XS1100 models. Correct fitment as the original factory coils, complete with black 7mm copper-core plug wires and primary lead-in harness with connector shell ---- plug-and-play! NOTE: the hard plastic resistive plug CAPS are not included and your original caps should be re-used or replacement caps ordered. Features the electrical specs as follows: 2.5 ohms on the primary side, and approximately 12K ohms on the secondary side (unlike most of the other aftermarket coils, which are actually designed for Honda or Kawasaki models, and have a much higher primary circuit resistance). NOTE: originally, there were two separate coils that differed only in the length of their spark plug lead wires (the #1/#4 coil had longer wires) and the color of the wire on the primary input. These reproduction coils are the "longer wire" version, and will thus work as either a #1/#4 coil or a #2/#3 coil (plug wires can be trimmed back, if desired, when used as the #2/3 right side coil). Primary wire colors are solid gray and red/white tracer, which is correct for the #2/3 coil (right side), but of course makes no difference in actual use or installation. Use 2 coils per bike. Each:
$ 59.95

HCP26825SET2 Aftermarket factory IGNITION COILS set of 2.
$ 109.95



HCP28644BLK Aftermarket IGNITION COILS SET. Fits all XJ650, all XJ750 air-cooled, all XJ900, XJ1100, and 1981 XS1100 models. These aftermarket coils will perfectly replace the original factory coils, and are complete with replaceable black 8mm copper-core plug wires and primary lead-in harness with connector shell ---- plug-and-play! NOTE: the hard plastic resistive plug CAPS are not included and your original caps should be re-used or replacement caps ordered. Features the electrical specs as follows: 2.4 ohms on the primary side, and approximately 12K ohms on the secondary side (unlike most of the other aftermarket coils, which are actually designed for Honda or Kawasaki models, and have a much higher primary circuit resistance). NOTE: these coils mount “rotated” compared to original coils, but present no fitment issues. Each set:
$ 129.95

HCP28644BLU Aftermarket IGNITION COILS SET. Fits all XJ650, all XJ750 air-cooled, all XJ900, XJ1100, and 1981 XS1100 models. These aftermarket coils will perfectly replace the original factory coils, and are complete with replaceable blue 8mm copper-core plug wires and primary lead-in harness with connector shell ---- plug-and-play! NOTE: the hard plastic resistive plug CAPS are not included and your original caps should be re-used or replacement caps ordered. Features the electrical specs as follows: 2.4 ohms on the primary side, and approximately 12K ohms on the secondary side (unlike most of the other aftermarket coils, which are actually designed for Honda or Kawasaki models, and have a much higher primary circuit resistance). NOTE: these coils mount “rotated” compared to original coils, but present no fitment issues. Each set:
$ 129.95

HCP28644YLW Aftermarket IGNITION COILS SET. Fits all XJ650, all XJ750 air-cooled, all XJ900, XJ1100, and 1981 XS1100 models. These aftermarket coils will perfectly replace the original factory coils, and are complete with replaceable yellow 8mm copper-core plug wires and primary lead-in harness with connector shell ---- plug-and-play! NOTE: the hard plastic resistive plug CAPS are not included and your original caps should be re-used or replacement caps ordered. Features the electrical specs as follows: 2.4 ohms on the primary side, and approximately 12K ohms on the secondary side (unlike most of the other aftermarket coils, which are actually designed for Honda or Kawasaki models, and have a much higher primary circuit resistance). NOTE: these coils mount “rotated” compared to original coils, but present no fitment issues. Each set:
$ 129.95

HCP28644RED Aftermarket IGNITION COILS SET. Fits all XJ650, all XJ750 air-cooled, all XJ900, XJ1100, and 1981 XS1100 models. These aftermarket coils will perfectly replace the original factory coils, and are complete with replaceable red 8mm copper-core plug wires and primary lead-in harness with connector shell ---- plug-and-play! NOTE: the hard plastic resistive plug CAPS are not included and your original caps should be re-used or replacement caps ordered. Features the electrical specs as follows: 2.4 ohms on the primary side, and approximately 12K ohms on the secondary side (unlike most of the other aftermarket coils, which are actually designed for Honda or Kawasaki models, and have a much higher primary circuit resistance). NOTE: these coils mount “rotated” compared to original coils, but present no fitment issues. Each set:
$ 129.95



Coil sets with plug caps:

HCP27694 OEM IGNITION COILS SET WITH PLUG CAPS fits both the #1/4 and #2/3 cylinders. Fits all XJ1100 and 1981 XS1100 models. These factory coils feature black 7mm copper-core plug wires and primary lead-in harness with connector shell ----- so they are truly plug-and-play! NOTE: aftermarket NGK hard plastic resistive plug caps are included. Electrical specs are as follows: 3.0 ohms on the primary side, and approximately 12.8K ohms on the secondary side. NOTE: originally, there were two separate coils that differed only in the length of their spark plug lead wires (the #1/#4 coil had longer wires) and the color of the wire on the primary input. These coils are the "longer wire" version, and will thus work as either a #1/#4 coil or a #2/#3 coil (plug wires can be trimmed back, if desired, when used as the #2/3 right side coil. Primary wire colors are solid orange and red/white tracer, which is correct for the #1/4 coil (left side), but of course it makes no difference in actual use or installation. Each set has 2 coils, enough for 1 bike.
$ 469.95

HCP27677 Aftermarket IGNITION COILS SET WITH PLUG CAPS fits both the #1/4 and #2/3 cylinders. Fits all XJ1100 and 1981 XS1100 models. Very similar profile to the original factory coils, complete with black 7mm copper-core plug wires and primary lead-in harness with connector shell ----- so they are truly plug-and-play! NOTE: aftermarket NGK hard plastic resistive plug caps are included. Features the electrical specs as follows: 2.5 ohms on the primary side, and approximately 12K ohms on the secondary side. NOTE: originally, there were two separate coils that differed only in the length of their spark plug lead wires (the #1/#4 coil had longer wires) and the color of the wire on the primary input. These aftermarket coils are the "longer wire" version, and will thus work as either a #1/#4 coil or a #2/#3 coil (plug wires can be trimmed back, if desired, when used as the #2/3 right side coil. Primary wire colors are solid gray and red/white tracer, which is correct for the #1/4 coil (left side), but of course it makes no difference in actual use or installation. Each set has 2 coils, enough for 1 bike.
$ 149.95



HCP28649BLK Aftermarket IGNITION COILS SET WITH PLUG CAPS. Fits all XJ1100 and 1981 XS1100 models. These aftermarket coils will perfectly replace the original factory coils, and are complete with replaceable black 8mm copper-core plug wires and primary lead-in harness with connector shell ---- plug-and-play! NOTE: the hard plastic resistive plug CAPS are included. Features the electrical specs as follows: 2.4 ohms on the primary side, and approximately 12K ohms on the secondary side (unlike most of the other aftermarket coils, which are actually designed for Honda or Kawasaki models, and have a much higher primary circuit resistance). NOTE: these coils mount “rotated” compared to original coils, but present no fitment issues. Each set:
$ 139.95

HCP28649BLU Aftermarket IGNITION COILS SET WITH PLUG CAPS. Fits all XJ1100 and 1981 XS1100 models. These aftermarket coils will perfectly replace the original factory coils, and are complete with replaceable blue 8mm copper-core plug wires and primary lead-in harness with connector shell ---- plug-and-play! NOTE: the hard plastic resistive plug CAPS are included. Features the electrical specs as follows: 2.4 ohms on the primary side, and approximately 12K ohms on the secondary side (unlike most of the other aftermarket coils, which are actually designed for Honda or Kawasaki models, and have a much higher primary circuit resistance). NOTE: these coils mount “rotated” compared to original coils, but present no fitment issues. Each set:
$ 139.95

HCP28649YLW Aftermarket IGNITION COILS SET WITH PLUG CAPS. Fits all XJ1100 and 1981 XS1100 models. These aftermarket coils will perfectly replace the original factory coils, and are complete with replaceable yellow 8mm copper-core plug wires and primary lead-in harness with connector shell ---- plug-and-play! NOTE: the hard plastic resistive plug CAPS are included. Features the electrical specs as follows: 2.4 ohms on the primary side, and approximately 12K ohms on the secondary side (unlike most of the other aftermarket coils, which are actually designed for Honda or Kawasaki models, and have a much higher primary circuit resistance). NOTE: these coils mount “rotated” compared to original coils, but present no fitment issues. Each set:
$ 139.95

HCP28649RED Aftermarket IGNITION COILS SET WITH PLUG CAPS. Fits all XJ1100 and 1981 XS1100 models. These aftermarket coils will perfectly replace the original factory coils, and are complete with replaceable red 8mm copper-core plug wires and primary lead-in harness with connector shell ---- plug-and-play! NOTE: the hard plastic resistive plug CAPS are included. Features the electrical specs as follows: 2.4 ohms on the primary side, and approximately 12K ohms on the secondary side (unlike most of the other aftermarket coils, which are actually designed for Honda or Kawasaki models, and have a much higher primary circuit resistance). NOTE: these coils mount “rotated” compared to original coils, but present no fitment issues. Each set:
$ 139.95




1984-85 FJ1100 and 1986-87 FJ1200 models:

Coil sets without plug caps:

HCP421 OEM factory IGNITION COIL fits both the #1/#4 and #2/#3 cylinders. Fits all 1984-85 FJ600, 1986-88 FZ600, all XJ700 all models, 1985-86 XJ750-X water-cooled models, 1984-85 FJ1100, and 1986-87 FJ1200 models. NOTE: originally, there were two separate coils that differed only in the length of their spark plug lead wires (the #1/#4 coil had longer wires). These original coils are now only available in the "longer wire" version, and will work as either a #1/#4 coil or a #2/#3 coil. Features the electrical specs as follows: 2.9 ohms on the primary side, and approximately 13.3K ohms on the secondary side. NOTE: the hard plastic resistive plug CAPS are not included and your original caps should be re-used or replacement caps ordered. Primary wire colors are solid gray and red/white tracer, which is correct for the #1/4 coil (left side), but of course it makes no difference in actual use or installation. Use 2 coils per bike. Each:
$ 199.95

HCP421SET2 OEM factory IGNITION COILS set of 2.
$ 379.95



HCP24241SET Aftermarket IGNITION COILS SET fits both the #1/4 and #2/3 cylinders. Fits all 1984-85 FJ600, 1986-88 FZ600, 1984-85 FJ1100, and 1986-87 FJ1200 models. Very similar profile to the original factory coils, complete with black 7mm copper-core plug wires and primary lead-in harness with connector shell -----so they are truly plug-and-play! NOTE: the hard plastic resistive plug CAPS are not included and your original caps should be re-used or replacement caps ordered. Features the electrical specs as follows: 2.9 ohms on the primary side, and approximately 15K ohms on the secondary side. NOTE: originally, there were two separate coils that differed only in the length of their spark plug lead wires (the #1/#4 coil had longer wires) and the color of the wire on the primary input. These reproduction coils are the "longer wire" version, and will thus work as either a #1/#4 coil or a #2/#3 coil (plug wires can be trimmed back, if desired, when used as the #2/3 right side coil). Each set has 2 coils, enough for 1 bike.
$ 119.95



Coil sets with plug caps:

HCP27691 OEM IGNITION COILS SET WITH PLUG CAPS fits both the #1/4 and #2/3 cylinders. Fits all 1984-85 FJ1100, and 1986-87 FJ1200 models. These factory coils feature black 7mm copper-core plug wires and primary lead-in harness with connector shell ----- so they are truly plug-and-play! NOTE: aftermarket NGK hard plastic resistive plug caps are included, as well as a set of 4 spark plug threaded terminal “stud nuts” (our part number HCP13158). These stud nuts are needed on most spark plugs used on these models to adapt correctly to the 10K ohm plug caps included with this set (if your spark plugs already have the smooth, hourglass-shaped stud nuts installed, then the included studs nuts can be saved as extras). Features the electrical specs as follows: 2.9 ohms on the primary side, and approximately 13.3K ohms on the secondary side. NOTE: originally, there were two separate coils that differed only in the length of their spark plug lead wires (the #1/#4 coil had longer wires) and the color of the wire on the primary input. These coils are the "longer wire" version, and will thus work as either a #1/#4 coil or a #2/#3 coil (plug wires can be trimmed back, if desired, when used as the #2/3 right side coil. Primary wire colors are solid gray and red/white tracer, which is correct for the #1/4 coil (left side), but of course it makes no difference in actual use or installation. Each set has 2 coils, enough for 1 bike.
$ 399.95

HCP27672 Aftermarket IGNITION COILS SET WITH PLUG CAPS fits both the #1/4 and #2/3 cylinders. Fits all 1984-85 FJ1100, and 1986-87 FJ1200 models. Very similar profile to the original factory coils, complete with black 7mm copper-core plug wires and primary lead-in harness with connector shell -----so they are truly plug-and-play! NOTE: aftermarket NGK hard plastic resistive plug caps are included, as well as a set of 4 spark plug threaded terminal “stud nuts” (our part number HCP13158). These stud nuts are needed on most spark plugs used on these models to adapt correctly to the 10K ohm plug caps included with this set (if your spark plugs already have the smooth, hourglass-shaped stud nuts installed, then the included studs nuts can be saved as extras). Features the electrical specs as follows: 2.9 ohms on the primary side, and approximately 15K ohms on the secondary side. NOTE: originally, there were two separate coils that differed only in the length of their spark plug lead wires (the #1/#4 coil had longer wires) and the color of the wire on the primary input. These reproduction coils are the "longer wire" version, and will thus work as either a #1/#4 coil or a #2/#3 coil (plug wires can be trimmed back, if desired, when used as the #2/3 right side coil. Each set has 2 coils, enough for 1 bike.
$ 139.95





ic3) Aftermarket HIGH-OUTPUT IGNITION COILS, features a pair of high-output (40kV) replacement coils. With only 3.0 ohms of primary resistance, this means you won't be burning up your TCI box, while their secondary circuit design means you’ll get a much more serious spark than your 30-years-old original stock factory coil could ever hope to produce.

Both the primary and high-voltage (output) terminals are brass, which means they'll never corrode; and each coil is fully and completely ultrasonically welded shut and encased in a tough thermoplastic shell to prevent any problems with moisture intrusion (a real problem with older factory coils). The output towers accept either 7mm or 8mm wires (please note that wires, output boots, mounting hardware, and spark plug caps are NOT included).

The complete COIL KITS listed further below use these same high-output coils, and are specifically designed to properly fit your bike without any (or minimal, on some models) cutting, cussing, or modification…..and include all necessary hardware, brackets, and instructions, making them easy to install and ready to deliver their benefits.



HCP12764 Aftermarket set of Dyna high-output IGNITION COILS, featuring integral input (primary) wire terminals. Does not include any plug wires, wire terminals, or coil mounting brackets. These coils are for use with all XJ550, all XJ700, and all XJ750-X (water-cooled) models. Set of 2 coils:
$ 159.95

HCP245 Aftermarket set of Dyna high-output IGNITION COILS, includes input (primary) wire terminals, screws, and nuts. Does not include any plug wires, wire terminals, or coil mounting brackets. These coils are for use with all XJ650, XJ750 air-cooled, XJ900, XJ1100, and all XS1100 models. Set of 2 coils:
$ 169.95



HCP20680 Aftermarket Dyna Coils MOUNTING KIT. This complete set of adapter brackets allows you to easily mount the HCP245 Dyna coils into the stock coil mounting forward tube and rear bracket that are welded to your frame. Without this kit, you'll spend a good 4-8 hours (at least) and a few very frustrating trips back-and-forth to the local hardware store to cobble together and fabricate the special brackets and hardware needed to shoe-horn these large Dyna coils into the tight, cramped confines of the frame. For use on all XJ650, all XJ750 air-cooled engines, and XJ900RK, RL, N/FN, and F models, XJ1100, and XS1100 models. Complete set includes 4 adapter brackets and coil-to-bracket hardware. You can re-use your original coil-to-frame hardware, or purchase new replacement hardware below, if desired. The installation procedures for Dyna coils can be reviewed at:

http://www.xj4ever.com/dyna coils install.pdf

NOTE: the installation of the Dyna coils requires the removal, on most models (except XJ/XS1100 models), of the flasher relay holder bracket that is tack-welded to the lower right side frame tube and which intrudes into the coil mounting area. The Dyna coils will not clear this bracket, and it must be cut away and ground off flush to the frame tube. A "universal" re-locator bracket is included with this kit which allows the re-positioning of that relay to an area where it fits properly.
$ 49.95


XS1100 owners may also need the following items:

HCP27570 Aftermarket Dyna Coils MOUNTING SPACERS SET. This set of 4 spacers allow for the proper mounting of the Dyna Coils into 1979-80 XS1100 Special and Midnight Special models and should be used in conjunction with the HCP20680 kit above for use on these models. Includes illustrated instructions.
$ 5.95

HCP26984 Aftermarket Dyna Coils BALLAST RESISTOR BY-PASS INSTRUCTIONS. Needed for use on all 1978-80 XS1100 models.
$ no charge when ordered with the HCP20680 or HCP27570 kit.




HCP19287 Aftermarket Dyna Coils MOUNTING KIT. This complete set of adapter brackets allows you to easily mount the HCP245 Dyna coils into the stock coil mounting bracket. Without this kit, you'll spend a good 4-8 hours (at least) and a few very frustrating trips back-and-forth to the local hardware store to cobble together and fabricate the special brackets and hardware needed to shoe-horn these large Dyna coils into the tight, cramped confines of the original coil bracket. For use on all XJ700-X and XJ750-X models (water-cooled engines) only. Complete set includes 2 hanger brackets, coil mounting hardware, water recovery tank spacers and hardware, and 4 coil wire tower boots and wire-end terminals (plug wires are NOT included). You can cut and re-use your original plug wires, or purchase new replacement wires below (recommended).
$ 34.95




HIGH-OUTPUT IGNITION COIL KITS:

ic33) Aftermarket HIGH-OUTPUT IGNITION COIL KITS includes a pair of high-output replacement coils, mounting hardware, and your choice of pre-made plug wires. Each coil can output up to 40kV of spark energy per cylinder, and the 3.0 ohms of primary resistance for each coil means you won't be burning up your TCI box.

Both the primary and high-voltage (output) terminals are brass, which means they'll never corrode; no exposed laminations to rust or degrade over time; and each coil is fully and completely ultrasonically welded shut and encased in a tough thermoplastic shell to prevent any problems with moisture intrusion (a real problem with older factory coils).

These kits are specifically designed to properly fit your bike without any cutting, cussing, or modification …..making them easy to install and ready to deliver their benefits.


all XJ550 and YX600 Radian models:

The following HIGH-OUTPUT IGNITION COIL KITS are designed to fit all XJ550 and YX600 Radian models without any frame modifications or cutting. Each kit features a pair of high-output coils sets, including the specially designed coil mounting brackets, illustrated instructions, and your choice of plug wire style and color, making these kits the finest bolt-on coil sets available.

Coil Kits with bare plug wire ends (for use with stock type plug caps):

All of the following kits come with a pair of coils, coil mounting hardware, and your choice of plug wires as outlined below. The front-of-coil rubber mounting dampers (HCP4245) are not included and should be ordered separate if your originals are damaged or missing.

HCP21720BLK This kit comes complete with black 8mm plug wires already installed; wires have bare ends for use with stock OEM or replacement style resistive plug caps (plug caps are not included). Fits all XJ550 and YX600 Radian models.
$ 289.95

HCP21720BLU This kit comes complete with blue 8mm plug wires already installed; wires have bare ends for use with stock OEM or replacement style resistive plug caps (plug caps are not included). Fits all XJ550 and YX600 Radian models.
$ 299.95

HCP21720RED This kit comes complete with red 8mm plug wires already installed; wires have bare ends for use with stock OEM or replacement style resistive plug caps (plug caps are not included). Fits all XJ550 and YX600 Radian models.
$ 299.95

HCP21720YLW This kit comes complete with yellow 8mm plug wires already installed; wires have bare ends for use with stock OEM or replacement style resistive plug caps (plug caps are not included). Fits all XJ550 and YX600 Radian models.
$ 299.95



Coil Kits with non-resistive plug boots included:

All of the following kits come with a pair of coils, coil mounting hardware, and your choice of plug wires with rubber, non-resistive plug-end wires as outlined below. In this situation, we suggest you change from your stock non-resistive spark plugs to aftermarket resistive plugs. The front-of-coil rubber mounting dampers (HCP4245) are not included and should be ordered separate if your originals are damaged or missing.

HCP21721BLK This kit comes complete with black 8mm plug wires already installed; wires have black non-resistive plug boots installed. Since these plug boots replace the use of the stock resistive plug caps, it is recommended that you also purchase a set of resistive spark plugs (HCP13514 standard resistive plugs or the HCP1297 hi-performance iridium resistive plugs). Spark plugs are not included with the kit. Fits all XJ550 and YX600 Radian models
$ 299.95

HCP21721BLU This kit comes complete with blue 8mm plug wires already installed; wires have black non-resistive plug boots installed. Since these plug boots replace the use of the stock resistive plug caps, it is recommended that you also purchase a set of resistive spark plugs (HCP13514 standard resistive plugs or the HCP1297 hi-performance iridium resistive plugs). Spark plugs are not included with the kit. Fits all XJ550 and YX600 Radian models.
$ 309.95

HCP21721RED This kit comes complete with red 8mm plug wires already installed; wires have black non-resistive plug boots installed. Since these plug boots replace the use of the stock resistive plug caps, it is recommended that you also purchase a set of resistive spark plugs (HCP13514 standard resistive plugs or the HCP1297 hi-performance iridium resistive plugs). Spark plugs are not included with the kit. Fits all XJ550 and YX600 Radian models.
$ 309.95

HCP21721YLW This kit comes complete with yellow 8mm plug wires already installed; wires have black non-resistive plug boots installed. Since these plug boots replace the use of the stock resistive plug caps, it is recommended that you also purchase a set of resistive spark plugs (HCP13514 standard resistive plugs or the HCP1297 hi-performance iridium resistive plugs). Spark plugs are not included with the kit. Fits all XJ550 and YX600 Radian models.
$ 309.95



Coil Kits with resistive plug caps included:

All of the following kits come with a pair of coils, coil mounting hardware, and your choice of plug wires with aftermarket resistive plug caps as outlined below. The front-of-coil rubber mounting dampers (HCP4245) are not included and should be ordered separate if your originals are damaged or missing.

HCP21722BLK This kit comes complete with black 8mm plug wires already installed; wires have aftermarket NGK resistive plug caps installed. This set-up is the closest equivalent to the factory style set-up, and you should use either the HCP1296 standard non-resistive spark plugs, or the HCP1297 hi-performance iridium resistive plugs (spark plugs are not included with the kit). Fits all XJ550 and YX600 Radian models.
$ 299.95

HCP21722BLU This kit comes complete with blue 8mm plug wires already installed; wires have aftermarket NGK resistive plug caps installed. This set-up is the closest equivalent to the factory style set-up, and you should use either the HCP1296 standard non-resistive spark plugs, or the HCP1297 hi-performance iridium resistive plugs (spark plugs (spark plugs are not included with the kit). Fits all XJ550 and YX600 Radian models.
$ 309.95

HCP21722RED This kit comes complete with red 8mm plug wires already installed; wires have aftermarket NGK resistive plug caps installed. This set-up is the closest equivalent to the factory style set-up, and you should use either the HCP1296 standard non-resistive spark plugs, or the HCP1297 hi-performance iridium resistive plugs (spark plugs are not included with the kit). Fits all XJ550 and YX600 Radian models.
$ 309.95

HCP21722YLW This kit comes complete with yellow 8mm plug wires already installed; wires have aftermarket NGK resistive plug caps installed. This set-up is the closest equivalent to the factory style set-up, and you should use either the HCP1296 standard non-resistive spark plugs, or the HCP1297 hi-performance iridium resistive plugs (spark plugs are not included with the kit). Fits all XJ550 and YX600 Radian models.
$ 309.95



all XJ650, XJ750 air-cooled, and 1983-89 XJ900 models:

The following HIGH-OUTPUT IGNITION COIL KITS are designed to fit all XJ650, XJ750 air-cooled models, and all 1983-89 XJ900 models without any frame modification (NOTE: some models will require the flasher relay hanger bracket, which is welded onto the right side frame tube, to be removed and re-located or replaced with the universal relay mounting bracket included). Each kit features a pair of high-output coils sets, including the specially designed coil mounting brackets, illustrated instructions, and your choice of plug wire style and color, making these kits the finest bolt-on coil sets available.


Coil Kits with bare plug wire ends (for use with stock type plug caps):

HCP22084BLK This kit comes complete with black 8mm plug wires already installed; wires have bare ends for use with stock OEM or replacement style resistive plug caps (plug caps are not included with this kit). Fits all XJ650, XJ750 air-cooled, and 1983-89 XJ900 models.
$ 279.95

HCP22084BLU This kit comes complete with blue 8mm plug wires already installed; wires have bare ends for use with stock OEM or replacement style resistive plug caps (plug caps are not included with this kit). Fits all XJ650, XJ750 air-cooled, and 1983-89 XJ900 models.
$ 289.95

HCP22084RED This kit comes complete with red 8mm plug wires already installed; wires have bare ends for use with stock OEM or replacement style resistive plug caps (plug caps are not included with this kit). Fits all XJ650, XJ750 air-cooled, and 1983-89 XJ900 models.
$ 289.95

HCP22084YLW This kit comes complete with yellow 8mm plug wires already installed; wires have bare ends for use with stock OEM or replacement style resistive plug caps (plug caps are not included with this kit). Fits all XJ650, XJ750 air-cooled, and 1983-89 XJ900 models.
$ 289.95



Coil Kits with non-resistive plug boots included:

HCP22085BLK This kit comes complete with black 8mm plug wires already installed; wires have black non-resistive plug boots installed. Since these plug boots replace the use of the stock resistive plug caps, it is recommended that you also purchase a set of resistive spark plugs (XJ650 and XJ750 models should use the HCP13513 standard resistive plugs or the HCP1293 hi-performance iridium resistive plugs, and XJ900 models should use the HCP1295 standard resistive plugs or the HCP13515 hi-performance iridium resistive plugs (spark plugs are not included with this kit). Fits all XJ650, XJ750 air-cooled, and 1983-89 XJ900 models.
$ 289.95

HCP22085BLU This kit comes complete with blue 8mm plug wires already installed; wires have black non-resistive plug boots installed. Since these plug boots replace the use of the stock resistive plug caps, it is recommended that you also purchase a set of resistive spark plugs (XJ650 and XJ750 models should use the HCP13513 standard resistive plugs or the HCP1293 hi-performance iridium resistive plugs, and XJ900 models should use the HCP1295 standard resistive plugs or the HCP13515 hi-performance iridium resistive plugs (spark plugs are not included with this kit). Fits all XJ650, XJ750 air-cooled, and 1983-89 XJ900 models.
$ 299.95

HCP22085RED This kit comes complete with red 8mm plug wires already installed; wires have black non-resistive plug boots installed. Since these plug boots replace the use of the stock resistive plug caps, it is recommended that you also purchase a set of resistive spark plugs (XJ650 and XJ750 models should use the HCP13513 standard resistive plugs or the HCP1293 hi-performance iridium resistive plugs, and XJ900 models should use the HCP1295 standard resistive plugs or the HCP13515 hi-performance iridium resistive plugs (spark plugs are not included with this kit). Fits all XJ650, XJ750 air-cooled, and 1983-89 XJ900 models.
$ 299.95

HCP22085YLW This kit comes complete with yellow 8mm plug wires already installed; wires have black non-resistive plug boots installed. Since these plug boots replace the use of the stock resistive plug caps, it is recommended that you also purchase a set of resistive spark plugs (XJ650 and XJ750 models should use the HCP13513 standard resistive plugs or the HCP1293 hi-performance iridium resistive plugs, and XJ900 models should use the HCP1295 standard resistive plugs or the HCP13515 hi-performance iridium resistive plugs (spark plugs are not included with this kit). Fits all XJ650, XJ750 air-cooled, and 1983-89 XJ900 models.
$ 299.95



Coil Kits with resistive plug caps included:

HCP22086BLK This kit comes complete with black 8mm plug wires already installed; wires have aftermarket NGK resistive plug caps installed. This set-up is the closest equivalent to the factory style set-up, and you should use either the proper (for your engine) non-resistive spark plugs, or the correct hi-performance iridium resistive plugs (spark plugs are not included with this kit). Fits all XJ650, XJ750 air-cooled, and 1983-89 XJ900 models.
$ 289.95

HCP22086BLU This kit comes complete with blue 8mm plug wires already installed; wires have aftermarket NGK resistive plug caps installed. This set-up is the closest equivalent to the factory style set-up, and you should use either the proper (for your engine) non-resistive spark plugs, or the correct hi-performance iridium resistive plugs (spark plugs are not included with this kit). Fits all XJ650, XJ750 air-cooled, and 1983-89 XJ900 models.
$ 299.95

HCP22086RED This kit comes complete with red 8mm plug wires already installed; wires have aftermarket NGK resistive plug caps installed. This set-up is the closest equivalent to the factory style set-up, and you should use either the proper (for your engine) non-resistive spark plugs, or the correct hi-performance iridium resistive plugs (spark plugs are not included with this kit). Fits all XJ650, XJ750 air-cooled, and 1983-89 XJ900 models.
$ 299.95

HCP22086YLW This kit comes complete with yellow 8mm plug wires already installed; wires have aftermarket NGK resistive plug caps installed. This set-up is the closest equivalent to the factory style set-up, and you should use either the proper (for your engine) non-resistive spark plugs, or the correct hi-performance iridium resistive plugs (spark plugs are not included with this kit). Fits all XJ650, XJ750 air-cooled, and 1983-89 XJ900 models.
$ 299.95




all 1978-80 XS1100 models:

The following HIGH-OUTPUT IGNITION COIL KITS are designed to fit all 1978-80 XS1100 models without any frame modification Each kit features a pair of high-output coils sets, including the specially designed coil mounting brackets, illustrated instructions, and your choice of plug wire style and color, making these kits the finest bolt-on coil sets available.

NOTE: 1978-80 models used individual “bullet” style electric terminals on the primary (input) wire harness (from the TCI to the coils), and used a ballast resistor within the main wire harness. 1981 XS1100 and all XJ1100 models used a more traditional 2-space white plastic connector shell (populated with flat-blade terminals), and no ballast resistor within the harness. XS1100 owners should verify which style your current system is using (things may have been swapped around by previous owners!) and order the appropriate 1978-80 or 1981 coil kit. If you system still has the ballast resistor, it must be bypassed (instructions are included) for the Dyna coils to perform properly.


Coil Kits with bare plug wire ends (for use with stock type plug caps):

HCP25509BLK This kit comes complete with black 8mm plug wires already installed; wires have bare ends for use with stock OEM or replacement style resistive plug caps (plug caps are not included with this kit). Fits all 1978-80 XS1100 models.
$ 279.95

HCP25509BLU This kit comes complete with blue 8mm plug wires already installed; wires have bare ends for use with stock OEM or replacement style resistive plug caps (plug caps are not included with this kit). Fits all 1978-80 XS1100 models.
$ 289.95

HCP25509RED This kit comes complete with red 8mm plug wires already installed; wires have bare ends for use with stock OEM or replacement style resistive plug caps (plug caps are not included with this kit). Fits all 1978-80 XS1100 models.
$ 289.95

HCP25509YEL This kit comes complete with yellow 8mm plug wires already installed; wires have bare ends for use with stock OEM or replacement style resistive plug caps (plug caps are not included with this kit). Fits all 1978-80 XS1100 models.
$ 289.95



Coil Kits with resistive plug caps included:

HCP25511BLK This kit comes complete with black 8mm plug wires already installed; wires have aftermarket NGK resistive plug caps installed. This set-up is the closest equivalent to the factory style set-up, and you should use either the proper (for your engine) non-resistive spark plugs, or the correct hi-performance iridium resistive plugs (spark plugs are not included with this kit). Fits all 1978-80 XS1100 models.
$ 289.95

HCP25511BLU This kit comes complete with blue 8mm plug wires already installed; wires have aftermarket NGK resistive plug caps installed. This set-up is the closest equivalent to the factory style set-up, and you should use either the proper (for your engine) non-resistive spark plugs, or the correct hi-performance iridium resistive plugs (spark plugs are not included with this kit). Fits all 1978-80 XS1100 models.
$ 299.95

HCP25511RED This kit comes complete with red 8mm plug wires already installed; wires have aftermarket NGK resistive plug caps installed. This set-up is the closest equivalent to the factory style set-up, and you should use either the proper (for your engine) non-resistive spark plugs, or the correct hi-performance iridium resistive plugs (spark plugs are not included with this kit). Fits all 1978-80 XS1100 models.
$ 299.95

HCP25511YEL This kit comes complete with yellow 8mm plug wires already installed; wires have aftermarket NGK resistive plug caps installed. This set-up is the closest equivalent to the factory style set-up, and you should use either the proper (for your engine) non-resistive spark plugs, or the correct hi-performance iridium resistive plugs (spark plugs are not included with this kit). Fits all 1978-80 XS1100 models.
$ 299.95




all 1981 XS1100 and 1982-84 XJ1100 models:

The following HIGH-OUTPUT IGNITION COIL KITS are designed to fit all 1981 XS1100 and 1982-84 XJ1100 models without any frame modification Each kit features a pair of high-output coils sets, including the specially designed coil mounting brackets, illustrated instructions, and your choice of plug wire style and color, making these kits the finest bolt-on coil sets available.

NOTE: 1978-80 XS1100 models used individual “bullet” style electric terminals on the primary (input) wire harness (from the TCI to the coils), and used a ballast resistor within the main wire harness. 1981 XS1100 and all XJ1100 models used a more traditional 2-space white plastic connector shell (populated with flat-blade terminals), and no ballast resistor within the harness. XS1100 owners should verify which style your current system is using (things may have been swapped around by previous owners!) and order the appropriate 1978-80 or 1981 coil kit. If you system still has the ballast resistor, it must be bypassed (instructions are included) for the Dyna coils to perform properly.


Coil Kits with bare plug wire ends (for use with stock type plug caps):

HCP27030BLK This kit comes complete with black 8mm plug wires already installed; wires have bare ends for use with stock OEM or replacement style resistive plug caps (plug caps are not included with this kit). Fits all 1981 XS1100 and 1982-84 XJ1100 models.
$ 279.95

HCP27030BLU This kit comes complete with blue 8mm plug wires already installed; wires have bare ends for use with stock OEM or replacement style resistive plug caps (plug caps are not included with this kit). Fits all 1981 XS1100 and 1982-84 XJ1100 models.
$ 289.95

HCP27030RED This kit comes complete with red 8mm plug wires already installed; wires have bare ends for use with stock OEM or replacement style resistive plug caps (plug caps are not included with this kit). Fits all 1981 XS1100 and 1982-84 XJ1100 models.
$ 289.95

HCP27030YEL This kit comes complete with yellow 8mm plug wires already installed; wires have bare ends for use with stock OEM or replacement style resistive plug caps (plug caps are not included with this kit). Fits all 1981 XS1100 and 1982-84 XJ1100 models.
$ 289.95



Coil Kits with resistive plug caps included:

HCP27026BLK This kit comes complete with black 8mm plug wires already installed; wires have aftermarket NGK resistive plug caps installed. This set-up is the closest equivalent to the factory style set-up, and you should use either the proper (for your engine) non-resistive spark plugs, or the correct hi-performance iridium resistive plugs (spark plugs are not included with this kit). Fits all 1981 XS1100 and 1982-84 XJ1100 models.
$ 289.95

HCP27026BLU This kit comes complete with blue 8mm plug wires already installed; wires have aftermarket NGK resistive plug caps installed. This set-up is the closest equivalent to the factory style set-up, and you should use either the proper (for your engine) non-resistive spark plugs, or the correct hi-performance iridium resistive plugs (spark plugs are not included with this kit). Fits all 1981 XS1100 and 1982-84 XJ1100 models.
$ 299.95

HCP27026RED This kit comes complete with red 8mm plug wires already installed; wires have aftermarket NGK resistive plug caps installed. This set-up is the closest equivalent to the factory style set-up, and you should use either the proper (for your engine) non-resistive spark plugs, or the correct hi-performance iridium resistive plugs (spark plugs are not included with this kit). Fits all 1981 XS1100 and 1982-84 XJ1100 models.
$ 299.95

HCP27026YEL This kit comes complete with yellow 8mm plug wires already installed; wires have aftermarket NGK resistive plug caps installed. This set-up is the closest equivalent to the factory style set-up, and you should use either the proper (for your engine) non-resistive spark plugs, or the correct hi-performance iridium resistive plugs (spark plugs are not included with this kit). Fits all 1981 XS1100 and 1982-84 XJ1100 models.
$ 299.95




all XJ700 air-cooled models:

The following HIGH-OUTPUT IGNITION COIL KITS are designed to fit all XJ700 models with the side-mounted coils, and installs without any frame modifications or cutting. Each kit features a pair of high-output coils sets, including the specially designed coil mounting brackets, illustrated instructions, and your choice of plug wire style and color, making these kits the finest bolt-on coil sets available.


Coil Kits with bare plug wire ends (for use with stock type plug caps):

All of the following kits come with a pair of coils, coil mounting hardware, and your choice of plug wires as outlined below.

HCP22029BLK This kit comes complete with black 8mm plug wires already installed; wires have bare ends for use with stock OEM or replacement style resistive plug caps (plug caps and spark plugs are not included). Fits all XJ700 air-cooled models.
$ 279.95

HCP22029BLU This kit comes complete with blue 8mm plug wires already installed; wires have bare ends for use with stock OEM or replacement style resistive plug caps (plug caps and spark plugs are not included). Fits all XJ700 air-cooled models.
$ 289.95

HCP22029RED This kit comes complete with red 8mm plug wires already installed; wires have bare ends for use with stock OEM or replacement style resistive plug caps (plug caps and spark plugs are not included). Fits all XJ700 air-cooled models.
$ 289.95

HCP22029YLW This kit comes complete with yellow 8mm plug wires already installed; wires have bare ends for use with stock OEM or replacement style resistive plug caps (plug caps and spark plugs are not included). Fits all XJ700 air-cooled models.
$ 289.95



Coil Kits with non-resistive plug boots included:

All of the following kits come with a pair of coils, coil mounting hardware, and your choice of plug wires with rubber, non-resistive plug-end wires as outlined below. In this situation, we suggest you change from your stock non-resistive spark plugs to aftermarket resistive plugs.

HCP22030BLK This kit comes complete with black 8mm plug wires already installed; wires have black non-resistive plug boots installed. Since these plug boots replace the use of the stock resistive plug caps, it is recommended that you also purchase a set of resistive spark plugs (HCP1295 standard resistive plugs or the HCP13515 hi-performance iridium resistive plugs). Spark plugs are not included with the kit. Fits all XJ700 air-cooled models.
$ 289.95

HCP22030BLU This kit comes complete with blue 8mm plug wires already installed; wires have black non-resistive plug boots installed. Since these plug boots replace the use of the stock resistive plug caps, it is recommended that you always use a set of resistive spark plugs (HCP1295 standard resistive plugs or the HCP13515 hi-performance iridium resistive plugs). Spark plugs are not included with the kit. Fits all XJ700 air-cooled models.
$ 299.95

HCP22030RED This kit comes complete with red 8mm plug wires already installed; wires have black non-resistive plug boots installed. Since these plug boots replace the use of the stock resistive plug caps, it is recommended that you also purchase a set of resistive spark plugs (HCP1295 standard resistive plugs or the HCP13515 hi-performance iridium resistive plugs). Spark plugs are not included with the kit. Fits all XJ700 air-cooled models.
$ 299.95

HCP22030YLW This kit comes complete with yellow 8mm plug wires already installed; wires have black non-resistive plug boots installed. Since these plug boots replace the use of the stock resistive plug caps, it is recommended that you also purchase a set of resistive spark plugs (HCP1295 standard resistive plugs or the HCP13515 hi-performance iridium resistive plugs). Spark plugs are not included with the kit. Fits all XJ700 air-cooled models.
$ 299.95



Coil Kits with resistive plug caps included:

All of the following kits come with a pair of coils, coil mounting hardware, and your choice of plug wires with aftermarket resistive plug caps as outlined below.

HCP22031BLK This kit comes complete with black 8mm plug wires already installed; wires have aftermarket NGK resistive plug caps installed. This set-up is the closest equivalent to the factory style set-up, and you should use either the HCP1294 standard non-resistive spark plugs (1985) or resistive plugs HCP1295 (1986 models), or the HCP13515 hi-performance iridium resistive plugs (spark plugs are not included with this kit). Fits all XJ700 air-cooled models.
$ 289.95

HCP22031BLU This kit comes complete with blue 8mm plug wires already installed; wires have aftermarket NGK resistive plug caps installed. This set-up is the closest equivalent to the factory style set-up, and you should use either the HCP1294 standard non-resistive spark plugs (1985) or resistive plugs HCP1295 (1986 models), or the HCP13515 hi-performance iridium resistive plugs (spark plugs are not included with this kit). Fits all XJ700 air-cooled models.
$ 299.95

HCP22031RED This kit comes complete with red 8mm plug wires already installed; wires have aftermarket NGK resistive plug caps installed. This set-up is the closest equivalent to the factory style set-up, and you should use either the HCP1294 standard non-resistive spark plugs (1985) or resistive plugs HCP1295 (1986 models), or the HCP13515 hi-performance iridium resistive plugs (spark plugs are not included with this kit). Fits all XJ700 air-cooled models.
$ 299.95

HCP22031YLW This kit comes complete with yellow 8mm plug wires already installed; wires have aftermarket NGK resistive plug caps installed. This set-up is the closest equivalent to the factory style set-up, and you should use either the HCP1294 standard non-resistive spark plugs (1985) or resistive plugs HCP1295 (1986 models), or the HCP13515 hi-performance iridium resistive plugs (spark plugs are not included with this kit). Fits all XJ700 air-cooled models.
$ 299.95




all XJ700-X water-cooled and XJ750-X water-cooled models:

The following HIGH-OUTPUT IGNITION COIL KITS are designed to fit all XJ700-X water-cooled and XJ750-X water cooled models using the bracket-mounted coils, and installs without any frame modifications or cutting. Each kit features a pair of high-output coils sets, including the specially designed coil mounting bracket, illustrated instructions, and your choice of plug wire style and color, making these kits the finest bolt-on coil sets available. NOTE: each kit comes with a modified coil hanger bracket, and requires the deposit of a $ 50.00 core charge, which is fully refunded upon the return of your original coil-hanger bracket.

Coil Kits with bare plug wire ends (for use with stock type plug caps):

All of the following kits come with a pair of coils, coil mounting hardware, and your choice of plug wires as outlined below.

HCP22032BLK This kit comes complete with black 8mm plug wires already installed; wires have bare ends for use with stock OEM or replacement style resistive plug caps (plug caps and spark plugs are not included). Fits all XJ700-X water-cooled and XJ750-X water-cooled models.
$ 289.95 + $ 50.00 refundable coil bracket deposit

HCP22032BLU This kit comes complete with blue 8mm plug wires already installed; wires have bare ends for use with stock OEM or replacement style resistive plug caps (plug caps and spark plugs are not included). Fits all XJ700-X water-cooled and XJ750-X water-cooled models.
$ 299.95+ $ 50.00 refundable coil bracket deposit

HCP22032RED This kit comes complete with red 8mm plug wires already installed; wires have bare ends for use with stock OEM or replacement style resistive plug caps (plug caps and spark plugs are not included). Fits all XJ700-X water-cooled and XJ750-X water-cooled models.
$ 299.95+ $ 50.00 refundable coil bracket deposit

HCP22032YLW This kit comes complete with yellow 8mm plug wires already installed; wires have bare ends for use with stock OEM or replacement style resistive plug caps (plug caps and spark plugs are not included). Fits all XJ700-X water-cooled and XJ750-X water-cooled models.
$ 299.95+ $ 50.00 refundable coil bracket deposit



Coil Kits with non-resistive plug boots included:

All of the following kits come with a pair of coils, coil mounting hardware, and your choice of plug wires with rubber, non-resistive plug-end wires as outlined below. In this situation, we suggest you change from your stock non-resistive spark plugs to aftermarket resistive plugs.

HCP22033BLK This kit comes complete with black 8mm plug wires already installed; wires have black non-resistive plug boots installed. Since these plug boots replace the use of the stock resistive plug caps, it is recommended that you also purchase a set of resistive spark plugs (HCP13514 standard resistive plugs for 1985 models or the HCP1298 standard resistive plugs for 1986 models, or the HCP1297 high-performance iridium plugs for either year models). Spark plugs are not included with the kit. Fits all XJ700-X water-cooled and XJ750-X water-cooled models.
$ 289.95 + $ 50.00 refundable coil bracket deposit

HCP22033BLU This kit comes complete with blue 8mm plug wires already installed; wires have black non-resistive plug boots installed. Since these plug boots replace the use of the stock resistive plug caps, it is recommended that you also purchase a set of resistive spark plugs (HCP13514 standard resistive plugs for 1985 models or the HCP1298 standard resistive plugs for 1986 models, or the HCP1297 high-performance iridium plugs for either year models). Spark plugs are not included with the kit. Fits all XJ700-X water-cooled and XJ750-X water-cooled models.
$ 299.95+ $ 50.00 refundable coil bracket deposit

HCP22033RED This kit comes complete with red 8mm plug wires already installed; wires have black non-resistive plug boots installed. Since these plug boots replace the use of the stock resistive plug caps, it is recommended that you also purchase a set of resistive spark plugs (HCP13514 standard resistive plugs for 1985 models or the HCP1298 standard resistive plugs for 1986 models, or the HCP1297 high-performance iridium plugs for either year models). Spark plugs are not included with the kit. Fits all XJ700-X water-cooled and XJ750-X water-cooled models.
$ 299.95+ $ 50.00 refundable coil bracket deposit

HCP22033YLW This kit comes complete with yellow 8mm plug wires already installed; wires have black non-resistive plug boots installed. Since these plug boots replace the use of the stock resistive plug caps, it is recommended that you also purchase a set of resistive spark plugs (HCP13514 standard resistive plugs for 1985 models or the HCP1298 standard resistive plugs for 1986 models, or the HCP1297 high-performance iridium plugs for either year models). Spark plugs are not included with the kit. Fits all XJ700-X water-cooled and XJ750-X water-cooled models.
$ 299.95+ $ 50.00 refundable coil bracket deposit



Coil Kits with resistive plug caps included:

All of the following kits come with a pair of coils, coil mounting hardware, and your choice of plug wires with aftermarket resistive plug caps as outlined below.

HCP22034BLK This kit comes complete with black 8mm plug wires already installed; wires have aftermarket NGK resistive plug caps installed. This set-up is the closest equivalent to the factory style set-up, and you should use a set of resistive spark plugs (HCP13514 standard resistive plugs for 1985 models or the HCP1298 standard resistive plugs for 1986 models, or the HCP1297 high-performance iridium plugs for either year models). Spark plugs are not included with the kit. Fits all XJ700-X water-cooled and XJ750-X water-cooled models.
$ 299.95+ $ 50.00 refundable coil bracket deposit

HCP22034BLU This kit comes complete with blue 8mm plug wires already installed; wires have aftermarket NGK resistive plug caps installed. This set-up is the closest equivalent to the factory style set-up, and you should use a set of resistive spark plugs (HCP13514 standard resistive plugs for 1985 models or the HCP1298 standard resistive plugs for 1986 models, or the HCP1297 high-performance iridium plugs for either year models). Spark plugs are not included with the kit. Fits all XJ700-X water-cooled and XJ750-X water-cooled models.
$ 309.95+ $ 50.00 refundable coil bracket deposit

HCP22034RED This kit comes complete with red 8mm plug wires already installed; wires have aftermarket NGK resistive plug caps installed. This set-up is the closest equivalent to the factory style set-up, and you should use a set of resistive spark plugs (HCP13514 standard resistive plugs for 1985 models or the HCP1298 standard resistive plugs for 1986 models, or the HCP1297 high-performance iridium plugs for either year models). Spark plugs are not included with the kit. Fits all XJ700-X water-cooled and XJ750-X water-cooled models.
$ 309.95+ $ 50.00 refundable coil bracket deposit

HCP22034YLW This kit comes complete with yellow 8mm plug wires already installed; wires have aftermarket NGK resistive plug caps installed. This set-up is the closest equivalent to the factory style set-up, and you should use a set of resistive spark plugs (HCP13514 standard resistive plugs for 1985 models or the HCP1298 standard resistive plugs for 1986 models, or the HCP1297 high-performance iridium plugs for either year models). Spark plugs are not included with the kit. Fits all XJ700-X water-cooled and XJ750-X water-cooled models.
$ 309.95+ $ 50.00 refundable coil bracket deposit




Stock Coil Mounting Hardware:

HCP4245 OEM ignition coil front (into frame) RUBBER INSULATOR, this special square, flanged rubber insulator holds the front mounting bar of the original coils to the frame. Use 1 per coil on all XJ550, 1986-90 YX600 Radian, 1986-88 FZ600, 1987 FZ700, 1988 FZ750, 1993-94 GTS1000, 1984-85 FJ1100, and all 1986-87 and 1989-93 FJ1200 models. Each:
$ 10.95

HCP22654 OEM ignition coil MOUNTING WASHER, this special u-shaped "double-washer" is used with both the front and rear mounting bolts. Use 2 per coil on all 1992-98 XJ600 Seca II models. Each:
$ 6.95


HCP4242 OEM ignition coil rear (into frame tube bracket) MOUNTING BOLT, use one per coil on all XJ550 models. Each:
$ 3.50

HCP19943 OEM ignition coil rear (into frame tube bracket) MOUNTING BOLT, use one per coil on all 1984-85 FJ600 models. Each:
$ 2.50

HCP22653 OEM ignition coil rear (into frame tube bracket) MOUNTING BOLT, use one per coil on all 1992-98 XJ600 Seca II models. Each:
$ 4.95


HCP4241 OEM ignition coil MOUNTING BOLT, use 1 per coil in both the front and rear mounting positions, on all XJ650, XJ750 air-cooled, all XJ900RK, RL, N/FN, and F models, and 1981 XS1100 Standard models. Alloy steel, hex-headed bolt features a black finish. Each:
$ 2.95

HCP25471 Aftermarket ignition coil MOUNTING BOLT, use 1 per coil in both the front and rear mounting positions, on all XJ650, XJ700, XJ750, all XJ900RK, RL, N/FN, and F models, and 1981 XS1100 Standard models. Alloy steel, hex-headed bolt features a bright zinc-plated finish. Each:
$ 1.95

HCP21647 Aftermarket ignition coil MOUNTING BOLT, use 1 per coil in both the front and rear mounting positions, on all XJ650, XJ700, XJ750, all XJ900RK, RL, N/FN, and F models, and 1981 XS1100 Standard models. Grade 18/8 stainless steel, hex-headed bolt features a bright finish. Each:
$ 2.25

HCP25472 Aftermarket ignition coil MOUNTING BOLT, use 1 per coil in both the front and rear mounting positions, on all XJ650, XJ700, XJ750, all XJ900RK, RL, N/FN, and F models, and 1981 XS1100 Standard models. Grade 316 stainless steel, hex-headed bolt features a bright finish. Each:
$ 2.95


HCP4243 OEM ignition coil MOUNTING BOLT, yellow zinc-plated hex-head alloy steel bolt, use 1 per coil in both the front and rear mounting positions, on all XJ1100 and all XS1100 models (except 1981 XS1100 Standard models). Each:
$ discontinued

HCP25526 Aftermarket ignition coil MOUNTING BOLT, bright zinc-plated hex-head alloy steel bolt, use 1 per coil in both the front and rear mounting positions, on all XJ1100 and all XS1100 models (except 1981 XS1100 Standard models). Each:
$ 4.95

HCP25476 Aftermarket ignition coil MOUNTING BOLT, black oxide coated sockethead (allen key drive) alloy steel bolt, use 1 per coil in both the front and rear mounting positions, on all XJ1100 and all XS1100 models (except 1981 XS1100 Standard models). Each:
$ 3.95


HCP3575 OEM ignition coil mounting bolt FLAT WASHER, use 1 per bolt in both the front and rear mounting positions, on all XJ650, XJ700, XJ750, XJ900RK, RL, N/FN, and F models, XJ1100, and all XS1100 models. Each:
$ 1.95



HCP2173 OEM ignition coil mounting bolt FLAT WASHER, use 1 per bolt in both the front and rear mounting positions on all 1984-85 FJ600 models, original bright finish, each:
$ 1.95

HCP6642 Aftermarket ignition coil mounting bolt FLAT WASHER, zinc-plated alloy steel with a natural finish, use 1 per bolt in both the front and rear mounting positions on all 1984-85 FJ600 models, each:
$ 0.95

HCP6643 Aftermarket ignition coil mounting bolt FLAT WASHER, 18-8 stainless steel with a natural finish, use 1 per bolt in both the front and rear mounting positions on all 1984-85 FJ600 models, each:
$ 1.25

HCP25756 Aftermarket ignition coil mounting bolt FLAT WASHER, 316 stainless steel with a natural finish, use 1 per bolt in both the front and rear mounting positions on all 1984-85 FJ600 models, each:
$ 1.95

HCP14285 Aftermarket ignition coil mounting bolt FLAT WASHER, black oxide-coated 18-8 stainless steel, use 1 per bolt in both the front and rear mounting positions on all 1984-85 FJ600 models, each:
$ 1.95

HCP14284 Aftermarket ignition coil mounting bolt FLAT WASHER, black oxide-coated hardened alloy steel, use 1 per bolt in both the front and rear mounting positions on all 1984-85 FJ600 models, each:
$ 2.95



HCP315 OEM ignition coil mounting bolt LOCK WASHER, use 1 per bolt in the rear mounting positions on all XJ550 models, and 1 per bolt in both the front and rear mounting positions on XJ1100 and all XS1100 models. Each:
$ 2.95

HCP916 Aftermarket zinc-plated alloy steel with a natural finish, ignition coil mounting bolt LOCK WASHER, use 1 per bolt in the rear mounting positions on all XJ550 models, and 1 per bolt in both the front and rear mounting positions on XJ1100 and all XS1100 models. Each:
$ 1.25

HCP319 Aftermarket 18-8 stainless steel ignition coil mounting bolt LOCK WASHER, use 1 per bolt in the rear mounting positions on all XJ550 models, and 1 per bolt in both the front and rear mounting positions on XJ1100 and all XS1100 models. Each:
$ 1.50

HCP321 Aftermarket black oxide-coated alloy steel ignition coil mounting bolt LOCK WASHER, use 1 per bolt in the rear mounting positions on all XJ550 models, and 1 per bolt in both the front and rear mounting positions on XJ1100 and all XS1100 models. Each:
$ 1.75



HCP2176 OEM ignition coil mounting bolt NUT, use 1 per bolt in both the front and rear mounting positions, on all FJ600, XJ650, XJ750, XJ900RK, RL, and N/FN, models, XJ1100, and all XS1100 models. Each:
$ 2.95

HCP24035 Aftermarket ignition coil mounting bolt NUT, made from 18/8 stainless steel, use 1 per bolt in both the front and rear mounting positions, on all FJ600, XJ650, XJ750, XJ900RK, RL, and N/FN, models, XJ1100, and all XS1100 models. Each:
$ 1.95


HCP3968 OEM ignition coil mounting bolt NUT, use 1 per bolt in both the front and rear mounting positions, on all XJ700-X and XJ750-X models. Each:
$ 2.95

HCP24059 Aftermarket ignition coil mounting bolt NUT, use 1 per bolt in both the front and rear mounting positions, on all XJ700-X and XJ750-X models. Black-oxide coated stainless steel. Each:
$ 1.95




SPARK PLUG WIRES:

spw2) Aftermarket SPARK PLUG WIRE, BOOTS, TERMINALS, and SHEATHING allow you to replace your old wire on your original coils, or create new wires for use with your replacement Dyna coils.

Available in a variety of colors, all of our wire is silicone-jacketed, stranded core, non-resistance wire just like the original plug wire....but it's available in a variety of colors and in both the original 7mm size and the more modern 8mm diameter. Note that the larger 8mm wire will fit (tightly!) into the stock plug caps.

Plug wire is sold in 15" lengths, which is more than enough to any of the four plug wires on all XJ models (whether you are splicing the wires onto an existing wire "stub", or going deep inside the coil). You will need to order 4 lengths to do a complete bike. If you wish to use these wires with aftermarket coils, then you can also choose from our selection of plug wire Terminals and Boots to complete the job.


Introduction:

If you've never really fiddled around with spark plug wires before, the terminology and the design of the replacement components can get a bit confusing, especially on these bikes, because what is termed a "coil" in Yamaha-speak is really a Coil Pack, and actually contains a variety of individual pieces all wrapped up together into one happy little black package. When creating your own system from the basic component pieces (as listed below), it really helps if you can visualize the separate, individual components of the system.......so here goes:


Your stock factory "coils" are really:

- a COIL,
- with integrated PLUG WIRES,
- and where the plug wires enter the coil body, there is a small, tightly-fitting insulating rubber BOOT,
- and attached to the business end of each plug wire (and what actually fits onto the top of the spark plug) is the resistive PLUG CAP,
- and unfortunately, many people call these resistive plug caps "BOOTS",
- which is not really correct, since that object is both an electrically resistive CAP with removable upper and lower, water- and electrical-proofing, protective molded rubber BOOTS,


On all engines besides the X models, the plug caps do come with small, black rubber insulating "boots", but for all practical purposes, the "cap" and the "boot" appear to be one and the same part (and the cap is the physically and visually larger part). On the water-cooled 700-X and 750-X models, there is no mistaking that there is a black CAP and a huge orange BOOT at the base of the cap.


Confusion is likely to set in when trying to understand the component parts list below if you are used to visualizing and referring to the original spark plug CAP and it's little water-proofing BOOTS by the single term BOOT, because when you get into the "components" world, the word BOOT means just that, just the "boot", and they are now the large objects that cover and insulate the plug (and the coil output terminals), but there is no CAP involved anymore!

If you study an original "coil" carefully, you will obviously note the actual coil, and exiting from the coil body thru a tightly fitting black rubber boot (the coil boot) is the spark plug wire, which runs down into the plug cap (thru a small, black rubber insulating boot at the top of the cap), and then at the bottom of the same cap, is another rubber insulating boot.


Finally, there is one other thing in the component world that you don't have in the "integrated" world, and that is the wire end METAL TERMINALS....which are made from either brass or plated steel. On your original factory coils, there are metal terminals that are fixed into the coil body (internally) and into the top end of the resistive cap. These terminals are either pointed "spears" or "sheetmetal screw" type terminals, and the plug wires are pushed into the spear point (inside the coil body) or screwed onto the screw terminal (inside the resistive cap). In the component world of aftermarket wires, the wire-end terminals are attached to the wires......think of the wire at the end of your toaster at home; at the end of the wire there is a "plug" with two or three metal terminals sticking out of it. The terminals are made onto the end of the wires!. Not so on your original coils!! The wire has no end terminals on it; the wire is pressed onto and into fixed metal terminals inside the coil and the cap.

If you cut off the plug from the end of your toaster, stripped the wires bare, and forced each wire into the wall sockets by hand.......well, now you have a better understanding of how Yamaha did it!


The big questions that you'll have to answer when purchasing aftermarket plug wire components are the following:

a) Will I be using the original or replacement spark plug CAPS at the spark plug end of the wires? If you do use the original or replacement CAPS, then you do NOT need to purchase the spark plug boot or the spark plug boot terminal.

b) If you will not be using your original or replacement spark plug CAPS, then you will need to purchase replacement spark plug BOOTS and the metal [/b]TERMINALS[/b] for those boots.

c) At the coil end of the spark plug wire: if your are still using factory coils, are you going to run the plug wire all the way into the body of the coil (in which case you'll be performing "coil surgery")? If so, then there are no other component parts that you'll need.

If you don't want to perform surgery, then you will be cutting off the original plug wire after it exits the stock coil body, and then you will have to splice the new plug wire onto this existing "stub" of original wire. In this situation, you will need a way to join the "stub" wire to your new wires, and you'll need the HCP2789 plug wire joiners or "splicers".


If you are using aftermarket coils (like the HCP245 Dyna coils), then at the coil end of the wire you will need a coil-end metal PLUG WIRE TERMINAL and a black rubber water-proofing BOOT.


Finally, original plug wires had an external black RUBBER SLEEVE that ran almost the entire length of the plug wire, from where the plug wire enters the coil body, to approximately 2-3" before where the plug wire enters the spark plug cap. This tough, flexible, heat-resistant sheath provided additional protection and security for the plug wire against temperature and wire insulator damage.


Typical Scenarios:

When replacing the wires on an original coil, you have two choices of how to proceed:

a: cut the original plug wire off just before it enters the coil body (leaving a 1" long "stub" to splice onto!), and splice the new wire onto this stud using the HCP2789 plug wire splicers listed further below, or.........

b: perform coil surgery, which allows you to replace the entire length of the plug wire (the preferred solution), but it's a somewhat tedious process:

http://xjbikes.com/forums/index.php?threads/11221


Of course, you should only replace the wires on original ignition coils if the coils are still within electrical resistance specs; otherwise, you're wasting time and money! Please read the section further above on COILS to determine whether your coils are electrically sound, before you even consider replacing the wires.


For the above reasons, we recommend either the use of the factory-style NGK plug caps, or, if you eliminate the plug caps from your system, then always use resistor plugs!

It really all comes down to WHERE in the entire wire, cap/boot, or spark plugs will the circuit resistance be created?

Most modern spark plug WIRE is resistance wire; each foot of wire has about 5,000 ohms of resistance in it because of the type of wire used. All of our wire is non-resistive wire (zero ohms of resistance----as is the original plug wires used on these bikes).

So the circuit resistance can be either in a spark plug CAP---this is how the original system is configured, and also what the replacement NGK plug caps offer.........or, the resistance can be in the SPARK PLUG itself (non-resistive or resistive plugs).

Of course, the total circuit resistance can actually be split up between any or all three of those components: the wire, the plug "cap" or "boot" (if it's resistive, it's typically called a "cap"; if it's non-resistive, it's usually called a "boot", but basically they are the same thing), or the spark plug.

For most many engines, the circuit specification is for 5K total resistance, and it is accomplished via:

- non-resistive wire
- a 5K resistive CAP (boot)
- non-resistive SPARK PLUG

but you could do this:

- non-resistive wire
- a non-resistive CAP (boot)
- a 5K resistive SPARK PLUG

or this (although we don't offer resistive wire):

- a 5K resistive wire
- a non-resistive CAP (boot)
- non-resistive SPARK PLUG

you could actually do it this way, too, if such components were available:

- a 2K resistive wire
- a 2K resistive CAP (boot)
- a 1K resistive SPARK PLUG


Some of the XJ700-X and XJ750-X models, for instance, use:

- non-resistive wire
- a 10K resistive CAP (boot)
- a 5K resistive SPARK PLUG

for a total circuit resistance of 15K.


Spark plugs are generally limited to being either non-resistive (zero ohms) or 5K (= 5,000 ohms) of resistance, and plug CAPS (boots) are either 0K, 5K, or 10K.

One last insight: since the spark plugs are the most commonly replaced item in the entire wire > cap/boot > spark plug run of components, some people prefer to use zero-ohm wire, zero-ohm caps, and 5K plugs---since the plugs have to be replaced periodically anyway, and that way, the resistive level of the system gets automatically "refreshed" periodically also, with every plug change........


By the way, all of our replacement spark plug resistive caps use the original style internal metal "threaded screw" method of retaining the plug wire to the spark plug cap......you simply "screw" or "spear" the central core of the plug wire onto the screw threads, making a simple yet effective and durable connection (we recommend a small amount of lubricant----our HCP1714 or HCP20861 silicone grease is perfect for this task-----or similar lubricant on the outer wire jacket end to simplify this procedure!).



When creating or replacing the wires for use with an aftermarket coil, you again have two choices of how to proceed:

a: buy a set of pre-made plug wires, such as our HCP4014 or HCP4015 sets, listed further below, or.........

b: roll your own, baby!: buy the wire, and 4 of the coil boots and their metal terminals, and use either your existing plug caps (or OE-style replacement plug caps), or aftermarket plug boots and their terminals (we recommend that you stick with the original OE-style plug caps, for reasons outlined above).

This illustrated guide can help you understand better what you'll need to do.......the plug wire creation instructions starts on page 15:

http://www.xj4ever.com/dyna coils install.pdf



PLUG-AND-PLAY SPARK PLUG WIRE SETS:

spw32) Aftermarket pre-assembled PLUG-AND-PLAY SPARK PLUG WIRE SETS feature copper-core, non-suppression (0 ohms resistance) high-performance 7mm or 8mm plug wires, and are ready to install on some stock Yamaha coils or most of our aftermarket performance ignition coils. A variety of plug-end wire configurations let you choose what is right for your needs.

For use with stock Yamaha ignition coils:

for all 1984-85 FJ600, all XJ700 models, and XJ750-X models using the stock Yamaha ignition coils:

NOTE: stock coil plug wires are not replaceable on any other model original coils besides these.

HCP27201BLK Aftermarket pre-assembled 7mm copper-core, non-suppression (zero ohms resistance) BLACK SPARK PLUG WIRE SET, includes individual plug wire number tags (1, 2, 3, and 4). Pre-cut to correct length for all 1984-5 FJ600, XJ700 (air-cooled and water-cooled models), and the XJ750-X water-cooled models using the stock Yamaha coils. Both ends of the wires are bare, and ready for installation into the stock Yamaha coils and into stock or aftermarket resistive plugs caps. Resistive caps are not included. NOTE: you should retain and re-use the original plug wire outer sleeve from your original plug wires, as it has the molded insulating “boot” that slips over the coil towers where each wire enters the coil body. One set does one bike.
$ 22.95

HCP27201YEL Aftermarket pre-assembled 7mm copper-core, non-suppression (zero ohms resistance) YELLOW SPARK PLUG WIRE SET, includes individual plug wire number tags (1, 2, 3, and 4). Pre-cut to correct length for all 1984-5 FJ600, XJ700 (air-cooled and water-cooled models), and the XJ750-X water-cooled models using the stock Yamaha coils. Both ends of the wires are bare, and ready for installation into the stock Yamaha coils and into stock or aftermarket resistive plugs caps. Resistive caps are not included. NOTE: you should retain and re-use the original plug wire outer sleeve from your original plug wires, as it has the molded insulating “boot” that slips over the coil towers where each wire enters the coil body. One set does one bike..
$ 24.95



HCP27202BLK Aftermarket pre-assembled 7mm copper-core, non-suppression (zero ohms resistance) BLACK SPARK PLUG WIRE SET, includes individual plug wire number tags (1, 2, 3, and 4). Pre-cut to correct length for 1984-85 FJ600 and 1986-88 FZ600 models using the stock Yamaha coils. Plug-end of the wires have the aftermarket NGK 10K-ohms resistive plug caps already installed, and are ready for installation into the original coil bodies and onto the spark plugs. Spark plugs are not included. NOTE: you should retain and re-use the original plug wire outer sleeve from your original plug wires, as it has the molded insulating “boot” that slips over the coil towers where each wire enters the coil body. One set does one bike.
$ 41.95

HCP27202YEL Aftermarket pre-assembled 7mm copper-core, non-suppression (zero ohms resistance) YELLOW SPARK PLUG WIRE SET, includes individual plug wire number tags (1, 2, 3, and 4). Pre-cut to correct length for 1984-85 FJ600 and 1986-88 FZ600 models using the stock Yamaha coils. Plug-end of the wires have the aftermarket NGK 10K-ohms resistive plug caps already installed, and are ready for installation into the original coil bodies and onto the spark plugs. Spark plugs are not included. NOTE: you should retain and re-use the original plug wire outer sleeve from your original plug wires, as it has the molded insulating “boot” that slips over the coil towers where each wire enters the coil body. One set does one bike.
$ 44.95



HCP27203BLK Aftermarket pre-assembled 7mm copper-core, non-suppression (zero ohms resistance) BLACK SPARK PLUG WIRE SET WITH RESISTIVE CAPS, includes individual plug wire number tags (1, 2, 3, and 4). Pre-cut to correct length for 1985-86 XJ700 air-cooled models using the stock Yamaha coils. Plug-end of the wires have the aftermarket NGK 5K-ohms resistive plug caps already installed, and are ready for installation into the original coil bodies and onto the spark plugs. NOTE: these wires include aftermarket 5K resistive plug caps, which is correct for the 1985-86 XJ700 air-cooled models. The 1986 XJ700 air-cooled models originally also used 5K resistive spark plugs, so for those 1986 models, you should also continue to use resistive spark plugs (HCP1295 standard or HCP13515 Iridium) when using this wire-and-caps set to maintain the 10K (per plug) resistance specifications. Spark plugs are not included. NOTE: you should retain and re-use the original plug wire outer sleeve from your original plug wires, as it has the molded insulating “boot” that slips over the coil towers where each wire enters the coil body. One set does one bike.
$ 49.95

HCP27203YEL Aftermarket pre-assembled 7mm copper-core, non-suppression (zero ohms resistance) YELLOW SPARK PLUG WIRE SET WITH RESISTIVE CAPS, includes individual plug wire number tags (1, 2, 3, and 4). Pre-cut to correct length for 1985-86 XJ700 air-cooled models using the stock Yamaha coils. Plug-end of the wires have the aftermarket NGK 5K-ohms resistive plug caps already installed, and are ready for installation into the original coil bodies and onto the spark plugs. NOTE: these wires include aftermarket 5K resistive plug caps, which is correct for the 1985-86 XJ700 air-cooled models. The 1986 XJ700 air-cooled models originally also used 5K resistive spark plugs, so for those 1986 models, you should also continue to use resistive spark plugs (HCP1295 standard or HCP13515 Iridium) when using this wire-and-caps set to maintain the 10K (per plug) resistance specifications. Spark plugs are not included. NOTE: you should retain and re-use the original plug wire outer sleeve from your original plug wires, as it has the molded insulating “boot” that slips over the coil towers where each wire enters the coil body. One set does one bike.
$ 51.95



HCP27204BLK Aftermarket pre-assembled 7mm copper-core, non-suppression (zero ohms resistance) BLACK SPARK PLUG WIRE SET WITH RESISTIVE CAPS, includes individual plug wire number tags (1, 2, 3, and 4). Pre-cut to correct length for 1985-86 XJ700-X and XJ750-X water-cooled models using the stock Yamaha coils. Plug-end of the wires have the aftermarket NGK 5K-ohms resistive plug caps already installed, and are ready for installation into the original coil bodies and onto the spark plugs. The 1985 XJ700-X water-cooled models originally also used 10K resistive caps and non-resistive spark plugs. The 10K caps are not available, so for the 1985 models, you should also use resistive spark plugs (HCP1298 standard or HCP1297 Iridium) when using this wire-and-caps set to maintain the 10K (per plug) resistance specifications. The 1986 XJ700-X and all XJ750-X models originally used 10K caps and 5K resistive spark plugs, and since 10K caps are not available, you will not be able to reach the total 15K resistance per wire/cap/plug as originally used. 1986 owners will have to use the stock 5K resistive spark plugs (HCP1298 standard or HCP1297 Iridium), which will give you 10K resistance per wire/cap/plug (same as on the 1985 models), and this is a suitable solution. Spark plugs are not included. NOTE: you should retain and re-use the original plug wire outer sleeve from your original plug wires, as it has the molded insulating “boot” that slips over the coil towers where each wire enters the coil body. One set does one bike.
$ 47.95

HCP27204YEL Aftermarket pre-assembled 7mm copper-core, non-suppression (zero ohms resistance) YELLOW SPARK PLUG WIRE SET WITH RESISTIVE CAPS, includes individual plug wire number tags (1, 2, 3, and 4). Pre-cut to correct length for 1985-86 XJ700-X and XJ750-X water-cooled models using the stock Yamaha coils. Plug-end of the wires have the aftermarket NGK 5K-ohms resistive plug caps already installed, and are ready for installation into the original coil bodies and onto the spark plugs. The 1985 XJ700-X water-cooled models originally also used 10K resistive caps and non-resistive spark plugs. The 10K caps are not available, so for the 1985 models, you should also use resistive spark plugs (HCP1298 standard or HCP1297 Iridium) when using this wire-and-caps set to maintain the 10K (per plug) resistance specifications. The 1986 XJ700-X and all XJ750-X models originally used 10K caps and 5K resistive spark plugs, and since 10K caps are not available, you will not be able to reach the total 15K resistance per wire/cap/plug as originally used. 1986 owners will have to use the stock 5K resistive spark plugs (HCP1298 standard or HCP1297 Iridium), which will give you 10K resistance per wire/cap/plug (same as on the 1985 models), and this is a suitable solution. Spark plugs are not included. NOTE: you should retain and re-use the original plug wire outer sleeve from your original plug wires, as it has the molded insulating “boot” that slips over the coil towers where each wire enters the coil body. One set does one bike.
$ 49.95




For use with our aftermarket high-performance ignition coils:

for all XJ550 and YX600 Radian models using our aftermarket performance Dyna Coils :

HCP21463BLK Aftermarket pre-assembled 8mm copper-core, non-suppression (zero ohms resistance) BLACK SPARK PLUG WIRE SET, with coil-end terminals already crimped, and includes the rubber boot at the coil-end of the wires, as well as individual plug wire number tags (1, 2, 3, and 4). Pre-cut to correct length for all XJ550 and YX600 Radian models using our performance Dyna Coils. Plug-end of the wires are bare, and ready for installation on stock or aftermarket resistive plugs caps. One set does one bike.
$ 49.95

HCP21463BLU Aftermarket pre-assembled 8mm copper-core, non-suppression (zero ohms resistance) DARK BLUE SPARK PLUG WIRE SET, with coil-end terminals already crimped, and includes the rubber boot at the coil-end of the wires, as well as individual plug wire number tags (1, 2, 3, and 4). Pre-cut to correct length for all XJ550 and YX600 Radian models using our performance Dyna Coils. Plug-end of the wires are bare, and ready for installation on stock or aftermarket resistive plugs caps. One set does one bike.
$ 52.95

HCP21463RED Aftermarket pre-assembled 8mm copper-core, non-suppression (zero ohms resistance) RED SPARK PLUG WIRE SET, with coil-end terminals already crimped, and includes the rubber boot at the coil-end of the wires, as well as individual plug wire number tags (1, 2, 3, and 4). Pre-cut to correct length for all XJ550 and YX600 Radian models using our performance Dyna Coils. Plug-end of the wires are bare, and ready for installation on stock or aftermarket resistive plugs caps. One set does one bike.
$ 52.95

HCP21463YEL Aftermarket pre-assembled 8mm copper-core, non-suppression (zero ohms resistance) YELLOW SPARK PLUG WIRE SET, with coil-end terminals already crimped, and includes the rubber boot at the coil-end of the wires, as well as individual plug wire number tags (1, 2, 3, and 4). Pre-cut to correct length for all XJ550 and YX600 Radian models using our performance Dyna Coils. Plug-end of the wires are bare, and ready for installation on stock or aftermarket resistive plugs caps. One set does one bike.
$ 52.95




HCP22453BLK Aftermarket pre-assembled 8mm copper-core, non-suppression (zero ohms resistance) BLACK SPARK PLUG WIRE SET WITH RESISTIVE PLUG CAPS, with coil-end terminals already crimped, and includes the rubber boot at the coil-end of the wires, as well as individual plug wire number tags (1, 2, 3, and 4). Pre-cut to correct length for all XJ550 and YX600 Radian models using our performance Dyna Coils. Plug-end of the wires have the aftermarket NGK resistive plug caps already installed, and are ready for installation onto stock or aftermarket resistive plugs caps. One set does one bike.
$ 59.95

HCP22453BLU Aftermarket pre-assembled 8mm copper-core, non-suppression (zero ohms resistance) DARK BLUE SPARK PLUG WIRE SET WITH RESISTIVE PLUG CAPS, with coil-end terminals already crimped, and includes the rubber boot at the coil-end of the wires, as well as individual plug wire number tags (1, 2, 3, and 4). Pre-cut to correct length for all XJ550 and YX600 Radian models using our performance Dyna Coils. Plug-end of the wires have the aftermarket NGK resistive plug caps already installed, and are ready for installation onto stock or aftermarket resistive plugs caps. One set does one bike.
$ 64.95

HCP22453RED Aftermarket pre-assembled 8mm copper-core, non-suppression (zero ohms resistance) RED SPARK PLUG WIRE SET WITH RESISTIVE PLUG CAPS, with coil-end terminals already crimped, and includes the rubber boot at the coil-end of the wires, as well as individual plug wire number tags (1, 2, 3, and 4). Pre-cut to correct length for all XJ550 and YX600 Radian models using our performance Dyna Coils. Plug-end of the wires have the aftermarket NGK resistive plug caps already installed, and are ready for installation onto stock or aftermarket resistive plugs caps. One set does one bike.
$ 64.95

HCP22453YEL Aftermarket pre-assembled 8mm copper-core, non-suppression (zero ohms resistance) YELLOW SPARK PLUG WIRE SET WITH RESISTIVE PLUG CAPS, with coil-end terminals already crimped, and includes the rubber boot at the coil-end of the wires, as well as individual plug wire number tags (1, 2, 3, and 4). Pre-cut to correct length for all XJ550 and YX600 Radian models using our performance Dyna Coils. Plug-end of the wires have the aftermarket NGK resistive plug caps already installed, and are ready for installation onto stock or aftermarket resistive plugs caps. One set does one bike.
$ 64.95



for all XJ650, 1981-84 XJ750, XJ900, and XJ1100 models using the HCP245 aftermarket performance Dyna Coils:

HCP21465BLK Aftermarket pre-assembled 8mm copper-core, non-suppression (zero ohms resistance) BLACK SPARK PLUG WIRE SET, with coil-end terminals already crimped, and includes the rubber boot at the coil-end of the wires, as well as individual plug wire number tags (1, 2, 3, and 4). Pre-cut to correct length for all XJ650, XJ750, XJ900, and XJ1100 models using the green Dyna Coils (our part number HCP245). Plug-end of the wires are bare, and ready for installation on stock or aftermarket resistive plugs caps. One set does one bike.
$ 49.95

HCP21465BLU Aftermarket pre-assembled 8mm copper-core, non-suppression (zero ohms resistance) DARK BLUE SPARK PLUG WIRE SET, with coil-end terminals already crimped, and includes the rubber boot at the coil-end of the wires, as well as individual plug wire number tags (1, 2, 3, and 4). Pre-cut to correct length for all XJ650, XJ750, XJ900, and XJ1100 models using the green Dyna Coils (our part number HCP245). Plug-end of the wires are bare, and ready for installation on stock or aftermarket resistive plugs caps. One set does one bike.
$ 52.95

HCP21465RED Aftermarket pre-assembled 8mm copper-core, non-suppression (zero ohms resistance) RED SPARK PLUG WIRE SET, with coil-end terminals already crimped, and includes the rubber boot at the coil-end of the wires, as well as individual plug wire number tags (1, 2, 3, and 4). Pre-cut to correct length for all XJ650, XJ750, XJ900, and XJ1100 models using the green Dyna Coils (our part number HCP245). Plug-end of the wires are bare, and ready for installation on stock or aftermarket resistive plugs caps. One set does one bike.
$ 52.95

HCP21465YLW Aftermarket pre-assembled 8mm copper-core, non-suppression (zero ohms resistance) YELLOW SPARK PLUG WIRE SET, with coil-end terminals already crimped, and includes the rubber boot at the coil-end of the wires, as well as individual plug wire number tags (1, 2, 3, and 4). Pre-cut to correct length for all XJ650, XJ750, XJ900, and XJ1100 models using the green Dyna Coils (our part number HCP245). Plug-end of the wires are bare, and ready for installation on stock or aftermarket resistive plugs caps. One set does one bike.
$ 52.95



HCP22451BLK Aftermarket pre-assembled 8mm copper-core, non-suppression (zero ohms resistance) BLACK SPARK PLUG WIRE SET WITH RESISTIVE PLUG CAPS, with coil-end terminals already crimped, and includes the rubber boot at the coil-end of the wires, as well as individual plug wire number tags (1, 2, 3, and 4). Pre-cut to correct length for all XJ650, XJ750, XJ900, and XJ1100 models using the green Dyna Coils (our part number HCP245). Plug-end of the wires have the aftermarket NGK resistive plug caps already installed, and are ready for installation onto spark plugs. NOTE: since these wires include the stock style resistive plug caps, you should use the stock non-resistive spark plugs when using this wire set. One set does one bike.
$ 69.95

HCP22451BLU Aftermarket pre-assembled 8mm copper-core, non-suppression (zero ohms resistance) DARK BLUE SPARK PLUG WIRE SET WITH RESISTIVE PLUG CAPS, with coil-end terminals already crimped, and includes the rubber boot at the coil-end of the wires, as well as individual plug wire number tags (1, 2, 3, and 4). Pre-cut to correct length for all XJ650, XJ750, XJ900, and XJ1100 models using the green Dyna Coils (our part number HCP245). Plug-end of the wires have the aftermarket NGK resistive plug caps already installed, and are ready for installation onto spark plugs. NOTE: since these wires include the stock style resistive plug caps, you should use the stock non-resistive spark plugs when using this wire set. One set does one bike.
$ 74.95

HCP22451RED Aftermarket pre-assembled 8mm copper-core, non-suppression (zero ohms resistance) RED SPARK PLUG WIRE SET WITH RESISTIVE PLUG CAPS, with coil-end terminals already crimped, and includes the rubber boot at the coil-end of the wires, as well as individual plug wire number tags (1, 2, 3, and 4). Pre-cut to correct length for all XJ650, XJ750, XJ900, and XJ1100 models using the green Dyna Coils (our part number HCP245). Plug-end of the wires have the aftermarket NGK resistive plug caps already installed, and are ready for installation onto spark plugs. NOTE: since these wires include the stock style resistive plug caps, you should use the stock non-resistive spark plugs when using this wire set. One set does one bike.
$ 74.95

HCP22451YLW Aftermarket pre-assembled 8mm copper-core, non-suppression (zero ohms resistance) YELLOW SPARK PLUG WIRE SET WITH RESISTIVE PLUG CAPS, with coil-end terminals already crimped, and includes the rubber boot at the coil-end of the wires, as well as individual plug wire number tags (1, 2, 3, and 4). Pre-cut to correct length for all XJ650, XJ750, XJ900, and XJ1100 models using the green Dyna Coils (our part number HCP245). Plug-end of the wires have the aftermarket NGK resistive plug caps already installed, and are ready for installation onto spark plugs. NOTE: since these wires include the stock style resistive plug caps, you should use the stock non-resistive spark plugs when using this wire set. One set does one bike.
$ 74.95



HCP21491BLK Aftermarket pre-assembled 8mm copper-core, non-suppression (zero ohms resistance) BLACK SPARK PLUG WIRE SET WITH NON-RESISTIVE RUBBER BOOTS, with coil-end terminals already crimped, and includes the rubber boot at the coil-end of the wires, as well as individual plug wire number tags (1, 2, 3, and 4). Pre-cut to correct length for all XJ650, XJ750, XJ900, and XJ1100 models using the green Dyna Coils (our part number HCP245). Plug-end of wires are terminated with flexible rubber non-resistive boots, and ready for installation onto spark plugs. NOTE: since these wires replace/eliminate the stock style resistive plug caps, you should use resistive spark plugs in place of the original non-resistive spark plugs. One set does one bike.
$ 59.95

HCP21491BLU Aftermarket pre-assembled 8mm copper-core, non-suppression (zero ohms resistance) DARK BLUE SPARK PLUG WIRE SET WITH NON-RESISTIVE RUBBER BOOTS, with coil-end terminals already crimped, and includes the rubber boot at the coil-end of the wires, as well as individual plug wire number tags (1, 2, 3, and 4). Pre-cut to correct length for all XJ650, XJ750, XJ900, and XJ1100 models using the green Dyna Coils (our part number HCP245). Plug-end of wires are terminated with flexible rubber non-resistive boots, and ready for installation onto spark plugs. NOTE: since these wires replace/eliminate the stock style resistive plug caps, you should use resistive spark plugs in place of the original non-resistive spark plugs. One set does one bike.
$ 64.95

HCP21491RED Aftermarket pre-assembled 8mm copper-core, non-suppression (zero ohms resistance) RED SPARK PLUG WIRE SET WITH NON-RESISTIVE RUBBER BOOTS, with coil-end terminals already crimped, and includes the rubber boot at the coil-end of the wires, as well as individual plug wire number tags (1, 2, 3, and 4). Pre-cut to correct length for all XJ650, XJ750, XJ900, and XJ1100 models using the green Dyna Coils (our part number HCP245). Plug-end of wires are terminated with flexible rubber non-resistive boots, and ready for installation onto spark plugs. [/u]NOTE[/u]: since these wires replace/eliminate the stock style resistive plug caps, you should use resistive spark plugs in place of the original non-resistive spark plugs. One set does one bike.
$ 64.95

HCP21491YLW Aftermarket pre-assembled 8mm copper-core, non-suppression (zero ohms resistance) YELLOW SPARK PLUG WIRE SET WITH NON-RESISTIVE RUBBER BOOTS, with coil-end terminals already crimped, and includes the rubber boot at the coil-end of the wires, as well as individual plug wire number tags (1, 2, 3, and 4). Pre-cut to correct length for all XJ650, XJ750, XJ900, and XJ1100 models using the green Dyna Coils (our part number HCP245). Plug-end of wires are terminated with flexible rubber non-resistive boots, and ready for installation onto spark plugs. NOTE: since these wires replace/eliminate the stock style resistive plug caps, you should use resistive spark plugs in place of the original non-resistive spark plugs. One set does one bike.
$ 64.95




for all XJ700 air-cooled models using our aftermarket performance Dyna Coils:

HCP21463BLK Aftermarket pre-assembled 8mm copper-core, non-suppression (zero ohms resistance) BLACK SPARK PLUG WIRE SET, with coil-end terminals already crimped, and includes the rubber boot at the coil-end of the wires, as well as individual plug wire number tags (1, 2, 3, and 4). Pre-cut to correct length for all XJ700 air-cooled models using our performance Dyna Coils. Plug-end of the wires are bare, and ready for installation on stock or aftermarket resistive plugs caps. One set does one bike.
$ 49.95

HCP21463BLU Aftermarket pre-assembled 8mm copper-core, non-suppression (zero ohms resistance) DARK BLUE SPARK PLUG WIRE SET, with coil-end terminals already crimped, and includes the rubber boot at the coil-end of the wires, as well as individual plug wire number tags (1, 2, 3, and 4). Pre-cut to correct length for all XJ700 air-cooled models using our performance Dyna Coils. Plug-end of the wires are bare, and ready for installation on stock or aftermarket resistive plugs caps. One set does one bike.
$ 52.95

HCP21463RED Aftermarket pre-assembled 8mm copper-core, non-suppression (zero ohms resistance) RED SPARK PLUG WIRE SET, with coil-end terminals already crimped, and includes the rubber boot at the coil-end of the wires, as well as individual plug wire number tags (1, 2, 3, and 4). Pre-cut to correct length for all XJ700 air-cooled models using our performance Dyna Coils. Plug-end of the wires are bare, and ready for installation on stock or aftermarket resistive plugs caps. One set does one bike.
$ 52.95

HCP21463YEL Aftermarket pre-assembled 8mm copper-core, non-suppression (zero ohms resistance) YELLOW SPARK PLUG WIRE SET, with coil-end terminals already crimped, and includes the rubber boot at the coil-end of the wires, as well as individual plug wire number tags (1, 2, 3, and 4). Pre-cut to correct length for all XJ700 air-cooled models using our performance Dyna Coils. Plug-end of the wires are bare, and ready for installation on stock or aftermarket resistive plugs caps. One set does one bike.
$ 52.95




HCP22452BLK Aftermarket pre-assembled 8mm copper-core, non-suppression (zero ohms resistance) BLACK SPARK PLUG WIRE SET WITH RESISTIVE PLUG CAPS, with coil-end terminals already crimped, and includes the rubber boot at the coil-end of the wires, as well as individual plug wire number tags (1, 2, 3, and 4). Pre-cut to correct length for all XJ700 air-cooled models using our performance Dyna Coils. Plug-end of the wires have the aftermarket NGK resistive plug caps already installed, and are ready for installation onto stock or aftermarket resistive plugs caps. One set does one bike.
$ 59.95

HCP22452BLU Aftermarket pre-assembled 8mm copper-core, non-suppression (zero ohms resistance) DARK BLUE SPARK PLUG WIRE SET WITH RESISTIVE PLUG CAPS, with coil-end terminals already crimped, and includes the rubber boot at the coil-end of the wires, as well as individual plug wire number tags (1, 2, 3, and 4). Pre-cut to correct length for all XJ700 air-cooled models using our performance Dyna Coils. Plug-end of the wires have the aftermarket NGK resistive plug caps already installed, and are ready for installation onto stock or aftermarket resistive plugs caps. One set does one bike.
$ 64.95

HCP22452RED Aftermarket pre-assembled 8mm copper-core, non-suppression (zero ohms resistance) RED SPARK PLUG WIRE SET WITH RESISTIVE PLUG CAPS, with coil-end terminals already crimped, and includes the rubber boot at the coil-end of the wires, as well as individual plug wire number tags (1, 2, 3, and 4). Pre-cut to correct length for all XJ700 air-cooled models using our performance Dyna Coils. Plug-end of the wires have the aftermarket NGK resistive plug caps already installed, and are ready for installation onto stock or aftermarket resistive plugs caps. One set does one bike.
$ 64.95

HCP22452YEL Aftermarket pre-assembled 8mm copper-core, non-suppression (zero ohms resistance) YELLOW SPARK PLUG WIRE SET WITH RESISTIVE PLUG CAPS, with coil-end terminals already crimped, and includes the rubber boot at the coil-end of the wires, as well as individual plug wire number tags (1, 2, 3, and 4). Pre-cut to correct length for all XJ700 air-cooled models using our performance Dyna Coils. Plug-end of the wires have the aftermarket NGK resistive plug caps already installed, and are ready for installation onto stock or aftermarket resistive plugs caps. One set does one bike.
$ 64.95



for all XJ700-X and XJ750-X models using the large HCP245 aftermarket performance Dyna Coils:

HCP21467BLK Aftermarket pre-assembled 8mm copper-core, non-suppression (zero ohms resistance) BLACK SPARK PLUG WIRE SET, with coil-end terminals already crimped, and includes the rubber boot at the coil-end of the wires, as well as individual plug wire number tags (1, 2, 3, and 4). Pre-cut to correct length for all XJ700-X and XJ750-X water-cooled models using the green Dyna Coils (our part number HCP245). Plug-end of the wires are bare, and ready for installation on stock or aftermarket resistive plugs caps. One set does one bike.
$ 49.95

HCP21467BLU Aftermarket pre-assembled 8mm copper-core, non-suppression (zero ohms resistance) DARK BLUE SPARK PLUG WIRE SET, with coil-end terminals already crimped, and includes the rubber boot at the coil-end of the wires, as well as individual plug wire number tags (1, 2, 3, and 4). Pre-cut to correct length for all XJ700-X and XJ750-X water-cooled models using the green Dyna Coils (our part number HCP245). Plug-end of the wires are bare, and ready for installation on stock or aftermarket resistive plugs caps. One set does one bike.
$ 52.95

HCP21467RED Aftermarket pre-assembled 8mm copper-core, non-suppression (zero ohms resistance) RED SPARK PLUG WIRE SET, with coil-end terminals already crimped, and includes the rubber boot at the coil-end of the wires, as well as individual plug wire number tags (1, 2, 3, and 4). Pre-cut to correct length for all XJ700-X and XJ750-X water-cooled models using the green Dyna Coils (our part number HCP245). Plug-end of the wires are bare, and ready for installation on stock or aftermarket resistive plugs caps. One set does one bike.
$ 52.95

HCP21467YEL Aftermarket pre-assembled 8mm copper-core, non-suppression (zero ohms resistance) YELLOW SPARK PLUG WIRE SET, with coil-end terminals already crimped, and includes the rubber boot at the coil-end of the wires, as well as individual plug wire number tags (1, 2, 3, and 4). Pre-cut to correct length for all XJ700-X and XJ750-X water-cooled models using the green Dyna Coils (our part number HCP245). Plug-end of the wires are bare, and ready for installation on stock or aftermarket resistive plugs caps. One set does one bike.
$ 52.95



HCP22455BLK Aftermarket pre-assembled 8mm copper-core, non-suppression (zero ohms resistance) BLACK SPARK PLUG WIRE SET WITH RESISTIVE PLUG CAPS, with coil-end terminals already crimped, and includes the rubber boot at the coil-end of the wires, as well as individual plug wire number tags (1, 2, 3, and 4). Pre-cut to correct length for all XJ700-X and XJ750-X water-cooled models using the green Dyna Coils (our part number HCP245). Plug-end of the wires have the aftermarket NGK resistive plug caps already installed, and are ready for installation onto spark plugs. NOTE: since these wires include aftermarket 5K resistive plug caps, you should continue to use (or switch to) resistive spark plugs when using this wire set. One set does one bike.
$ 69.95

HCP22455BLU Aftermarket pre-assembled 8mm copper-core, non-suppression (zero ohms resistance) DARK BLUE SPARK PLUG WIRE SET WITH RESISTIVE PLUG CAPS, with coil-end terminals already crimped, and includes the rubber boot at the coil-end of the wires, as well as individual plug wire number tags (1, 2, 3, and 4). Pre-cut to correct length for all XJ700-X and XJ750-X water-cooled models using the green Dyna Coils (our part number HCP245). Plug-end of the wires have the aftermarket NGK resistive plug caps already installed, and are ready for installation onto spark plugs. NOTE: since these wires include aftermarket 5K resistive plug caps, you should continue to use (or switch to) resistive spark plugs when using this wire set. One set does one bike.
$ 74.95

HCP22455RED Aftermarket pre-assembled 8mm copper-core, non-suppression (zero ohms resistance) RED SPARK PLUG WIRE SET WITH RESISTIVE PLUG CAPS, with coil-end terminals already crimped, and includes the rubber boot at the coil-end of the wires, as well as individual plug wire number tags (1, 2, 3, and 4). Pre-cut to correct length for all XJ700-X and XJ750-X water-cooled models using the green Dyna Coils (our part number HCP245). Plug-end of the wires have the aftermarket NGK resistive plug caps already installed, and are ready for installation onto spark plugs. NOTE: since these wires include aftermarket 5K resistive plug caps, you should continue to use (or switch to) resistive spark plugs when using this wire set. One set does one bike.
$ 74.95

HCP22455YEL Aftermarket pre-assembled 8mm copper-core, non-suppression (zero ohms resistance) YELLOW SPARK PLUG WIRE SET WITH RESISTIVE PLUG CAPS, with coil-end terminals already crimped, and includes the rubber boot at the coil-end of the wires, as well as individual plug wire number tags (1, 2, 3, and 4). Pre-cut to correct length for all XJ700-X and XJ750-X water-cooled models using the green Dyna Coils (our part number HCP245). Plug-end of the wires have the aftermarket NGK resistive plug caps already installed, and are ready for installation onto spark plugs. NOTE: since these wires include aftermarket 5K resistive plug caps, you should continue to use (or switch to) resistive spark plugs when using this wire set. One set does one bike.
$ 74.95



HCP22454BLK Aftermarket pre-assembled 8mm copper-core, non-suppression (zero ohms resistance) BLACK SPARK PLUG WIRE SET WITH NON-RESISTIVE RUBBER BOOTS, with coil-end terminals already crimped, and includes the rubber boot at the coil-end of the wires, as well as individual plug wire number tags (1, 2, 3, and 4). Pre-cut to correct length for all XJ700-X and XJ750-X water-cooled models using the green Dyna Coils (our part number HCP245). Plug-end of wires are terminated with flexible rubber non-resistive boots, and ready for installation onto spark plugs. NOTE: since these wires replace/eliminate the stock style resistive plug caps, you should use resistive spark plugs in place of the original non-resistive spark plugs. One set does one bike.
$ 74.95

HCP22454BLU Aftermarket pre-assembled 8mm copper-core, non-suppression (zero ohms resistance) DARK BLUE SPARK PLUG WIRE SET WITH NON-RESISTIVE RUBBER BOOTS, with coil-end terminals already crimped, and includes the rubber boot at the coil-end of the wires, as well as individual plug wire number tags (1, 2, 3, and 4). Pre-cut to correct length for all XJ700-X and XJ750-X water-cooled models using the green Dyna Coils (our part number HCP245). Plug-end of wires are terminated with flexible rubber non-resistive boots, and ready for installation onto spark plugs. NOTE: since these wires replace/eliminate the stock style resistive plug caps, you should use resistive spark plugs in place of the original non-resistive spark plugs. One set does one bike.
$ 79.95

HCP22454RED Aftermarket pre-assembled 8mm copper-core, non-suppression (zero ohms resistance) RED SPARK PLUG WIRE SET WITH NON-RESISTIVE RUBBER BOOTS, with coil-end terminals already crimped, and includes the rubber boot at the coil-end of the wires, as well as individual plug wire number tags (1, 2, 3, and 4). Pre-cut to correct length for all XJ700-X and XJ750-X water-cooled models using the green Dyna Coils (our part number HCP245). Plug-end of wires are terminated with flexible rubber non-resistive boots, and ready for installation onto spark plugs. NOTE: since these wires replace/eliminate the stock style resistive plug caps, you should use resistive spark plugs in place of the original non-resistive spark plugs. One set does one bike.
$ 79.95

HCP22454YEL Aftermarket pre-assembled 8mm copper-core, non-suppression (zero ohms resistance) YELLOW SPARK PLUG WIRE SET WITH NON-RESISTIVE RUBBER BOOTS, with coil-end terminals already crimped, and includes the rubber boot at the coil-end of the wires, as well as individual plug wire number tags (1, 2, 3, and 4). Pre-cut to correct length for all XJ700-X and XJ750-X water-cooled models using the green Dyna Coils (our part number HCP245). Plug-end of wires are terminated with flexible rubber non-resistive boots, and ready for installation onto spark plugs. NOTE: since these wires replace/eliminate the stock style resistive plug caps, you should use resistive spark plugs in place of the original non-resistive spark plugs. One set does one bike.
$ 79.95



for all XJ700-X and XJ750-X models using the aftermarket performance Dyna Mini-Coils:

HCP21581BLK Aftermarket pre-assembled 8mm copper-core, non-suppression (zero ohms resistance) BLACK SPARK PLUG WIRE SET, with coil-end terminals already crimped, and includes the rubber boot at the coil-end of the wires, as well as individual plug wire number tags (1, 2, 3, and 4). Pre-cut to correct length for all XJ700-X and XJ750-X water-cooled models using the performance Dyna Mini-Coils (our part number HCP12764). Plug-end of the wires are bare, and ready for installation on stock or aftermarket resistive plugs caps. One set does one bike.
$ 49.95

HCP21581BLU Aftermarket pre-assembled 8mm copper-core, non-suppression (zero ohms resistance) DARK BLUE SPARK PLUG WIRE SET, with coil-end terminals already crimped, and includes the rubber boot at the coil-end of the wires, as well as individual plug wire number tags (1, 2, 3, and 4). Pre-cut to correct length for all XJ700-X and XJ750-X water-cooled models using the performance Dyna Mini-Coils (our part number HCP12764). Plug-end of the wires are bare, and ready for installation on stock or aftermarket resistive plugs caps. One set does one bike.
$ 52.95

HCP21581RED Aftermarket pre-assembled 8mm copper-core, non-suppression (zero ohms resistance) RED SPARK PLUG WIRE SET, with coil-end terminals already crimped, and includes the rubber boot at the coil-end of the wires, as well as individual plug wire number tags (1, 2, 3, and 4). Pre-cut to correct length for all XJ700-X and XJ750-X water-cooled models using the performance Dyna Mini-Coils (our part number HCP12764). Plug-end of the wires are bare, and ready for installation on stock or aftermarket resistive plugs caps. One set does one bike.
$ 52.95

HCP21581YEL Aftermarket pre-assembled 8mm copper-core, non-suppression (zero ohms resistance) YELLOW SPARK PLUG WIRE SET, with coil-end terminals already crimped, and includes the rubber boot at the coil-end of the wires, as well as individual plug wire number tags (1, 2, 3, and 4). Pre-cut to correct length for all XJ700-X and XJ750-X water-cooled models using the performance Dyna Mini-Coils (our part number HCP12764). Plug-end of the wires are bare, and ready for installation on stock or aftermarket resistive plugs caps. One set does one bike.
$ 52.95



HCP21576BLK Aftermarket pre-assembled 8mm copper-core, non-suppression (zero ohms resistance) BLACK SPARK PLUG WIRE SET WITH RESISTIVE PLUG CAPS, with coil-end terminals already crimped, and includes the rubber boot at the coil-end of the wires, as well as individual plug wire number tags (1, 2, 3, and 4). Pre-cut to correct length for all XJ700-X and XJ750-X water-cooled models using the performance Dyna Mini-Coils (our part number HCP12764). Plug-end of the wires have the aftermarket NGK resistive plug caps already installed, and are ready for installation onto spark plugs. NOTE: since these wires include aftermarket 5K resistive plug caps, you should continue to use resistive spark plugs when using this wire set. One set does one bike.
$ 59.95

HCP21576BLU Aftermarket pre-assembled 8mm copper-core, non-suppression (zero ohms resistance) DARK BLUE SPARK PLUG WIRE SET WITH RESISTIVE PLUG CAPS, with coil-end terminals already crimped, and includes the rubber boot at the coil-end of the wires, as well as individual plug wire number tags (1, 2, 3, and 4). Pre-cut to correct length for all XJ700-X and XJ750-X water-cooled models using the performance Dyna Mini-Coils (our part number HCP12764). Plug-end of the wires have the aftermarket NGK resistive plug caps already installed, and are ready for installation onto spark plugs. NOTE: since these wires include aftermarket 5K resistive plug caps, you should continue to use resistive spark plugs when using this wire set. One set does one bike.
$ 64.95

HCP21576RED Aftermarket pre-assembled 8mm copper-core, non-suppression (zero ohms resistance) RED SPARK PLUG WIRE SET WITH RESISTIVE PLUG CAPS, with coil-end terminals already crimped, and includes the rubber boot at the coil-end of the wires, as well as individual plug wire number tags (1, 2, 3, and 4). Pre-cut to correct length for all XJ700-X and XJ750-X water-cooled models using the performance Dyna Mini-Coils (our part number HCP12764). Plug-end of the wires have the aftermarket NGK resistive plug caps already installed, and are ready for installation onto spark plugs. NOTE: since these wires include aftermarket 5K resistive plug caps, you should continue to use resistive spark plugs when using this wire set. One set does one bike.
$ 64.95

HCP21576YEL Aftermarket pre-assembled 8mm copper-core, non-suppression (zero ohms resistance) YELLOW SPARK PLUG WIRE SET WITH RESISTIVE PLUG CAPS, with coil-end terminals already crimped, and includes the rubber boot at the coil-end of the wires, as well as individual plug wire number tags (1, 2, 3, and 4). Pre-cut to correct length for all XJ700-X and XJ750-X water-cooled models using the performance Dyna Mini-Coils (our part number HCP12764). Plug-end of the wires have the aftermarket NGK resistive plug caps already installed, and are ready for installation onto spark plugs. NOTE: since these wires include aftermarket 5K resistive plug caps, you should continue to use resistive spark plugs when using this wire set. One set does one bike.
$ 64.95




SPARK PLUG WIRE COMPONENTS a/k/a Build-Your-Own Plug Wires:

Zero-Resistance Spark Plug Wire:

HCP2790 Aftermarket original type BLACK SPARK PLUG WIRE, 7mm silicone-jacketed stranded copper core wire, non-suppression (0 ohms), 15" length. NOTE: original plug wire uses stainless steel (rather than copper) wire, such as the HCP10694 wire listed below. This stranded copper wire is offered as a less expensive alternative. Each:
$ 3.95

HCP2790SET4 Aftermarket original type BLACK SPARK PLUG WIRES, 7mm silicone-jacketed stranded copper core wire, non-suppression (0 ohms), set of 4 pieces, each 15" long:
$ 13.95


HCP10694 Aftermarket original type BLACK SPARK PLUG WIRE, 7mm silicone-jacketed stranded stainless steel core wire, non-suppression (0 ohms), 15" length. Each:
$ 4.95

HCP10694SET4 Aftermarket original type BLACK SPARK PLUG WIRES, 7mm silicone-jacketed stranded stainless steel core wire, non-suppression (0 ohms), set of 4 pieces, each 15" long:
$ 17.95



HCP10671 Aftermarket high-performance BLACK SPARK PLUG WIRE, 8mm silicone-jacketed stranded stainless steel core wire, non-suppression (0 ohms), 15" length. Each:
$ 5.95

HCP10671SET4 Aftermarket high-performance BLACK SPARK PLUG WIRES, 8mm silicone-jacketed stranded stainless steel core wire, non-suppression (0 ohms), set of 4 pieces, each 15" long:
$ 19.95



HCP10672 Aftermarket high-performance BLUE SPARK PLUG WIRE, 8mm silicone-jacketed stranded stainless steel core wire, non-suppression (0 ohms), 15" length. Each:
$ 5.95

HCP10672SET4 Aftermarket high-performance BLUE SPARK PLUG WIRES, 8mm silicone-jacketed stranded stainless steel core wire, non-suppression (0 ohms), set of 4 pieces, each 15" long:
$ 19.95



HCP10673 Aftermarket high-performance RED SPARK PLUG WIRE, 8mm silicone-jacketed stranded stainless steel core wire, non-suppression (0 ohms), 15" length. Each:
$ 5.95

HCP10673SET4 Aftermarket high-performance RED SPARK PLUG WIRES, 8mm silicone-jacketed stranded stainless steel core wire, non-suppression (0 ohms), set of 4 pieces, each 15" long:
$ 19.95



HCP12636 Aftermarket standard-performance YELLOW SPARK PLUG WIRE, 7mm silicone-jacketed stranded copper core wire, non-suppression (0 ohms), 15" length. Each:
$ 4.95

HCP12636SET4 Aftermarket standard-performance YELLOW SPARK PLUG WIRES, 7mm silicone-jacketed stranded copper core wire, non-suppression (0 ohms), set of 4 pieces, each 15" long:
$ 17.95



HCP10701 Aftermarket high-performance YELLOW SPARK PLUG WIRE, 8mm silicone-jacketed stranded copper core wire, non-suppression (0 ohms), 15" length. Each:
$ 5.95

HCP10701SET4 Aftermarket high-performance YELLOW SPARK PLUG WIRES, 8mm silicone-jacketed stranded copper core wire, non-suppression (0 ohms), set of 4 pieces, each 15" long:
$ 19.95



Spark Plug Wire Splicer:

pw1) Aftermarket NGK-brand SPARK PLUG WIRE SPLICER. This handy little device allows you to cut off a bad original plug wire and splice in a replacement piece, which is really handy, since the plug wires on the original factory coils are basically non-replaceable......so if a plug wire goes bad, unless you are willing to perform "coil surgery", then the whole coil is junk!


This plug wire splicer or "joiner" allows you to extend or replace a damaged or bad plug wire, just like you would splice into a piece of electrical wire. The watertight, screw-on design is made from a high-impact plastic material and adds no resistance (0 ohms) to the circuit. Will accept either 7mm or 8mm plug wire (but no larger).....meaning you can also use this to splice original 7mm plug wires to aftermarket 8mm wires. A very handy and practical solution!


HCP2789 Aftermarket SPARK PLUG WIRE SPLICER, fits up to 8mm plug wire. Each:
$ 8.95

HCP2789SET4 Aftermarket SPARK PLUG WIRE SPLICERS, fits up to 8mm plug wire, set of 4:
$ 34.95



Spark Plug Wire Sleeve:

Whether you're building your own wires from scratch, replacing wire on an original coil, or just refreshing original wires on your bike, this flexible black rubber sleeving fits semi-snugly over the outer insulation of the plug wires and adds an additional level of heat and sharp-edge protection for the plug wires.

HCP13147 Aftermarket black PLUG WIRE SLEEVING, flexible heat-resistant neoprene rubber sleeve correct replaces original sleeving on all models or for use when building your own wires. Fits all original or aftermarket 7mm plug wires. Most models use 12-16" of sleeving per plug wire. Sold per foot:
$ 2.50

HCP13123 Aftermarket black PLUG WIRE SLEEVING, flexible heat-resistant neoprene rubber sleeve looks like the original sleeving used on all models, and is recommended when building your own wires. Fits all aftermarket 8mm plug wires. Most models use 12-16" of sleeving per plug wire. Sold per foot:
$ 3.25



Spark Plug Wire Accessories:

When you create your own plug wires, it's very useful to use these handy wire number markers to designate which wire goes to which cylinder, so in case all of your wires are removed from the plugs at one time, you'll know exactly which cylinder to install them back onto!

HCP9740 Aftermarket spark plug wire NUMBER TAGS, labeled 1, 2, 3, and 4, clip-on design has black numbers on a white background. Complete set comes with one of each number.
$ 7.95

HCP10670 Aftermarket spark plug wire NUMBER TAGS, labeled 1, 2, 3, and 4, heat-shrink design has white numbers on a black background. Complete set comes with one of each number.
$ 8.95



Spark Plug Wire Boots, Terminals, and Tools:

Although we offer the replacement NGK resistive plug CAPS further below, some people may desire or need to replace them with these high-quality aftermarket PLUG BOOTS and PLUG-END METAL TERMINALS, and if you're replacing your original coils with Dyna coils, then you'll also need the COIL BOOTS and COIL-END METAL TERMINALS.

We offer a variety of high quality, high performance components to allow you to create complete, customized plug wires. However, be aware that the wire-end metal terminals should always be both crimped and soldered onto the plug wire ends, in order to maintain electrical integrity and prevent voltage leaks. A proper crimping tool is available, but it's not cheap!

But, if you decide to go full custom, we have all of the proper and necessary plug boot, coil boots, and metal terminals necessary to do the job correctly.

All boots and terminals will fit either 7mm or 8mm plug wire.

The 90- and 135-degree plug-end boots are approximately 1.5" tall and "reach" 1-3/4" towards the plug wire.

The 180-degree ("straight") plug-end boots are approximately 3.25" tall.



Plug-End Wire Boots and Terminals:

NOTE: original ignition systems depend on having a certain amount of "total system electrical resistance" to operate properly, and the original spark plug CAPS are part of that total system resistance. The replacement spark plug TERMINALS and BOOTS below have zero resistance, and thus using these components to terminate your plug wires will reduce that "total system resistance" by the amount of resistance that the original plug caps provided.

In such a situation, we suggest gaining back the amount of resistance provided by the original plug caps by using resistor plugs in place of the stock non-resistor plugs in those models in which it is possible to do so.


HCP10811 Aftermarket molded BLACK SPARK PLUG BOOT, 90-degree angle. Use with the HCP9750 brass terminals listed below. Each:
$ 1.95

HCP9747 Aftermarket molded BLUE SPARK PLUG BOOT, 90-degree angle. Use with the HCP9750 brass terminals listed below. Each:
$ 1.95

HCP10674 Aftermarket molded GREY SPARK PLUG BOOT, 90-degree angle. Use with the HCP9750 brass terminals listed below. Each:
$ 1.95



HCP10812 Aftermarket molded BLACK SPARK PLUG BOOT, 135-degree angle. Use with the HCP9751 brass terminals listed below. Each:
$ 1.95

HCP9748 Aftermarket molded BLUE SPARK PLUG BOOT, 135-degree angle. Use with the HCP9751 brass terminals listed below. Each:
$ 1.95

HCP10675 Aftermarket molded GREY SPARK PLUG BOOT, 135-degree angle. Use with the HCP9751 brass terminals listed below. Each:
$ 1.95



HCP10813 Aftermarket molded BLACK SPARK PLUG BOOT, 180-degree, straight boot (no bend). Use with the HCP9752 brass terminals listed below. Each:
$ 1.95

HCP9749 Aftermarket molded BLUE SPARK PLUG BOOT, 180-degree, straight boot (no bend). Use with the HCP9752 brass terminals listed below. Each:
$ 1.95

HCP10676 Aftermarket molded GREY SPARK PLUG BOOT, 180-degree, straight boot (no bend). Use with the HCP9752 brass terminals listed below. Each:
$ 1.95




HCP9750 Aftermarket spark plug wire-end METAL TERMINAL, used at the spark plug end of the wire, 90-degree bend. Use with any of the 90-degree plug boots listed above. Each:
$ 1.50

HCP9751 Aftermarket spark plug wire-end METAL TERMINAL, used at the spark plug end of the wire, 135-degree bend. Use with any of the 135-degree plug boots listed above. Each:
$ 1.50

HCP9752 Aftermarket spark plug wire-end METAL TERMINAL, used at the spark plug end of the wire, straight (no bend). Use with any of the straight plug boots listed above. Each:
$ 1.50



Coil-End Wire Boots and Terminals:

HCP9741 Aftermarket rubber BLACK COIL BOOT, 90-degree angle. Use with the HCP9745 terminals listed below. Each:
$ 1.95

HCP9742 Aftermarket rubber BLACK COIL BOOT, straight. Use with the HCP9746 terminals listed below. Each:
$ 1.95



HCP9745 Aftermarket coil-end wire METAL TERMINAL, used at the coil end of the wire, 90-degree bend. Use with the 90-degree coil boot HCP9741 listed above. Each:
$ 1.50

HCP9746 Aftermarket coil-end wire METAL TERMINAL, used at the coil end of the wire, straight (no bend). Use with the straight coil boot HCP9742 listed above. Each:
$ 1.50


NOTE ON COIL BOOTS: all XJ550, XJ650, XJ700 non-X, XJ750 non-X, XJ900RK, and XJ1100 models can use either the straight or the 90-degree angle coil boots when retro-fitting aftermarket Dyna coils. The XJ700-X and XJ750-X models should use the straight boots and terminals on the front coil output towers, and use the 90-degree boots and terminals on the rear coil output towers.



Spark Plug Wire Assembly Service:

Order whatever combination of raw plug wires, terminals, boots or plug caps, wire sleeve, wire markers, etc. from the above choices and we will be glad to assemble the wires for you, saving you the cost of purchasing either of the wire crimper tools below.

WIRE-ASSEMBLE Spark plug WIRE ASSEMBLY SERVICE, covers the cost of doing all four plug wires and any combo of accessories from above.
$ 19.95


Spark Plug Wire Terminal Crimping Tools:

NOTE: THE FOLLOWING TOOLS ARE AVAILABLE FOR RENTAL!!: some tools are a one-time or infrequent use tool, so it may be more economical for you to rent them from us, rather than to purchase outright. Please see the “rental” section within the THE TOOLBOX section of our catalog at:

http://xjbikes.com/forums/index.php?threads/xj-parts-catalog-section-p-the-toolbox.44630

and review the availability and procedures in the TOOL RENTAL section.


HCP20451 Aftermarket spark plug wire terminal CRIMPING TOOL. This basic, 7-function hand-crimp tool incorporates wire butter, terminal crimper, and wire stripper functions into one handy tool. Black anodized finish with insulated hand grips, crimp slot on end of tool secures most ignition terminals including "W" type, right angle and "High Tower" terminals. Will crimp 7mm to 8.5mm plug wire, and works with 10- to 22-gauge solderless terminals.
$ 39.95

HCP9739 Aftermarket spark plug wire terminal CRIMPING TOOL. This high-quality, professional grade ratcheting tool is easy-to-use feel, but will still achieve a complete and thorough crimp of the wire terminals to the plug wire, preventing future separation or electrical resistance issues. The right tool for the job makes life easier......
$ 89.95





SPARK PLUG CAPS:

pc2) Original TD (Tokia-Denso) and aftermarket NGK SPARK PLUG CAPS are available in a variety of styles and configurations. All plug caps include their upper and lower rubber end boots.

Okay, before we get going, let's quickly review a little bit about the original Yamaha COILS, PLUG WIRES, PLUG CAPS, and the SPARK PLUGS used on these bikes.

NOTE: there is a a lot of information below about a sometimes mystifying topic….electricity, and electrical resistance (and how it can make your life better……) below. Please ask questions if there’s anything that you don’t understand in relation to selecting the correct components for your bike!

Factory ignition systems are designed to operate properly with a total system resistance on the secondary side (the "going-to-the-spark-plugs" side) of the ignition coils of around 20-30K ohms (ohms being a measure of electrical resistance). Electrical resistance depends on a number of factors: wire size, type of material, length of material, age of material, ambient temperature, etc. etc. In any case, most factory XJ coils and plug wires combined --- BUT WITHOUT THE CAPS OR PLUGS ATTACHED --- are specified to have a resistance of around 11K ohms (+/- 20%) at 68-degrees Fahrenheit. Please see the complete list of specifications in the "COILS" section above.

Plug WIRES on factory coils are non-replaceable, at least not without a bit of surgery. Suffice it to say that if your coils measure out of specs for resistance (as described above), they're junk and should be replaced, either with another factory coil, one of our aftermarket coils, or a pair of the HCP245 Dyna aftermarket coils.

We do offer an NGK plug wire in-line splicer (HCP2789) that will allow you to cut off and remove a bad factory wire and replace it with a length of our aftermarket plug wire, in cases where the wire itself gets damaged, but the coil itself is still in good shape (physically and electrically).


The original spark plug wire resistive CAPS---mistakenly called "boots" by some people---are the hard plastic insulators that fit onto the spark plug threaded stud, and accept the plug wire from the coil on their other end via a simple "twist-on" method------yes, the plug wire end of the cap has a metal screw that bites into and "screws" onto the end of the plug wire, penetrating the plug wire inner metal core and making a mechanical connection.

Plug caps use a small internal ceramic resistor, and the resistance of each cap should be checked with an ohmmeter on a periodic basis. Caps that are +/- 20% resistance from specified levels are considered bad, and should be replaced:



NOTE: "K" is abbreviation for a thousand units, so "5K" ohms = 5,000 ohms of resistance, etc.

NOTE: some models within this era could have been fitted with "noise suppression" plug caps (these caps are evidenced by a metal "shield" wrapped around the plastic cap body) and such caps may have used a higher resistance rating as opposed to their stock ratings listed below (for non "noise suppression" style caps).


5K +/- 20% = 4,000 to 6,000 ohms per cap acceptable range:
all XJ650 models
1985 XJ700 air-cooled models
all 1981-84 XJ750 (except XJ750RL) models
all 1983-84 XJ900RK and RL models
all XJ1100 models
all XS1100 models
NOTE: some sources specify that XJ650 models, XJ750 air-cooled models, and XJ900, XJ1100 and XS1100 models used 5K caps on the outer plug (#1 and #4), and 10K caps on the inner plugs (cylinders #2 and #3). Other sources say that all 4 caps were 5K ohms. And other sources say that 10K caps were used on the outer cylinders (#1 and #4), while the two center cylinders use 10K caps…….whew! Our recommendation is to use the 5K caps on all 4 cylinders.


10K +/- 20% = 8,000 to 12,000 ohms per cap acceptable range:
all XJ550 models
1986 XJ700 air-cooled models
all XJ700-X water-cooled models
all XJ750-X water-cooled models
1984 XJ750RL models
all 1985-up XJ900F, N, and FN models


15K +/- 20% = 12,000 to 18,000 ohms per cap acceptable range:
all XJ900S and SH models


Spark plug "boots", typically seen on automotive engine plug wires, are usually only a protective (insulating) rubber cover........there is no internal resistor (as with plug "caps") since there is an internal direct-connection from the spark plug wire to the spark plug top terminal stud. Automotive ignition systems take care of system resistance via the spark plug itself, and the spark plug wire (which is resistive, unlike on these bikes, which use non-resistive wire), and thus do not rely on a resistive plug "cap" to regulate the resistance of the ignition secondary circuit. Yamaha chose to go with non-resistive plug wire, resistive plug caps, and (on most models) non-resistive spark plugs....thus allowing the resistive plug "cap" to handle the entire resistive load for the secondary circuit.

So don’t resist (ha-ha), go ahead and read this and become an electrical-resistance genius:

http://www.motorcycleproject.com/text/plugwiretech.html


A variety of different size and shape plug caps are listed below, in both their original Tokai Denso ("TD") brand and replacement NGK brand. The replacement NGK caps come in a variety of original configurations and can be safely used to replace broken, missing, damaged, or out-of-spec original caps. And all original and replacement caps will accept up to 8mm spark plug wires easily.

NOTE: all original and replacement spark plug caps are designed to be used on spark plugs that have their screw-on threaded stud topper “nut” removed. All of the original TD and most of the NGK replacement plug caps are designed to be used on spark plugs without this “stud nut”. All replacement 12mm NGK plugs come with a nut, while most 14mm NGK plus have the removable stud nut included, but it must be removed before use. Note that the HCP13192 and HCP19193 plug caps (10K) do require the use of the stud nut (available separately as part HCP13158), and owners of all XJ550 models, 1986 XJ700 air-cooled models, all XJ700-X water-cooled models, all XJ750-X water-cooled models, 1984 XJ750RL models, and all 1985-up XJ900F, N, and FN models should salvage the stud nuts off of their original spark plugs (if purchasing new NGK spark plugs), or, purchase a set of the HCP13158 nuts (which can be re-used indefinitely by transferring it from plug to plug).



It is important to remember that you should strive to keep the ignition coil secondary circuit (plug wire, plug cap, and spark plug) total resistance as close as possible to original specifications, which are:

- 15K ohms per cylinder on all 1986 XJ700-X, XJ750-X, and XJ900 S/SH models.
- 10K ohms per cylinder on all XJ550, 1985 XJ700-X models, 1986 XJ700 non-X, XJ750RL, and XJ900 N/FN and F models.
- 5K ohms per cylinder on all XJ650, 1985 XJ700 non-X, all 1981-83 XJ750 models, XJ750-D, XJ900RK and RL models, and XJ1100 models.
NOTE: some sources specify that XJ650 models, XJ750 air-cooled models, and XJ900, XJ1100 and XS1100 models used 5K caps on the outer plug (#1 and #4), and 10K caps on the inner plugs (cylinders #2 and #3). Additionally, it is noted that non-North American models would indeed use 5K caps on all four cylinders. This conflicting information from a variety of sources can lead to quite a bit of confusion. Our recommendation is to use 5K caps on all 4 cylinders. Of course, if you wish to experiment (to see if there is any meaningful performance enhancements in doing so) and increase the resistance (from 5K to 10K) on the two center cylinders, you can do so by the following methods:

a) use the stock non-resistive spark plugs on all 4 cylinders, and use 5K caps on the outer cylinders and 10K caps on the inner cylinders.

b) use stock non-resistive spark plugs on the outer cylinders, and resistive (5K) spark plugs on the center cylinders, and then use 5K caps on all plug wires.


NOTE: there may be some benefit to reducing your plug cap resistance by 5K from stock values, and increasing the spark plug resistance by 5K from stock, since spark plugs normally need to be changed every 7,500 miles or so, and when changing the spark plugs, you are also automatically "re-setting" its resistance value. Otherwise, in most stock configurations, your 0K (non-resistive) plugs gets changed frequently, but your plug caps are retained, even though their resistance ratings are deteriorating over time. By "transferring" the resistive load from the very infrequently replaced plug caps to the rather regularly replaced spark plugs, you then get to take advantage of the regular replacement cycle that naturally occurs with spark plug changes. On the other hand, plug caps tend to retain their resistance value for a long time, and it will typically take many years/miles before plug caps get outside of their +/-20% resistance values…………


Just remember to add up the resistance of your plug wires (original wires and all of our replacement wires are 0K ohms, non-resistance wire), the spark plugs (0K for non-resistive plugs, 5K for resistive plugs), and of your plug caps (which can be varied as outlined above) to arrive at the correct total resistance value for each plug!

EXAMPLE: 1982 XJ650 Maxim models originally used the HCP1292 non-resistive (zero ohms) BP7ES spark plugs, along with 5,000 (5K) ohm plug caps on each plug. If you substitute a resistive plug (such as the HCP1293 Iridium plugs, or any other resistive plug) for the original non-resistive plug, then your spark plug + plug cap total resistance will increase from the original 5,000 (5K) ohms to 10,000 (10K) ohms. Therefore, you should reduce the resistance in the plug cap to zero ohms to keep the system at the same total resistance levels as original.

The key to remember is that you simply want to maintain the TOTAL system resistance at whatever the factory rating is. You can't do much about what the coils themselves are rated at, so outside of the coils, you have three choices of where the resistance can be added:

a) the plug wires
b) the plug caps
c) the plugs

For example, the XJ550's require 10K (10,000) ohms of resistance in each plug wire + plug cap + spark plug (these 3 components are the “secondary” ignition coil circuit (outside of the ignition coil itself). . You can achieve this specified 10K of resistance thru any combination of component pieces; however, it may be simpler to use zero-resistance wires, and then use either:

1) 10K plug caps and 0-ohm (non-resistive) spark plugs (this is the method that was originally used).

2) 5K aftermarket NGK plug caps and 5K aftermarket resistor plugs.


Finally, always check --- with an ohmmeter --- the coil primary and secondary resistance, your plug cap resistance, and your spark plug resistance and condition before you start "throwing money" at engine performance problems that seem to be electrically-related!



Spark Plug Resistor Caps:

All original Tokia Denso SPARK PLUG CAPS come fully assembled and include both the upper plug-wire black rubber boot and the large lower plug-body black rubber boot (orange on XJ700-X and XJ750-X models) as original. All original caps will accept the original 7mm plug wire or our replacement 8mm plug wires. Although there were specific models which may have used different resistance ratings at different cylinder positions (outer vs. inner cylinders) and different resistance ratings between models, all caps can be used on any cylinder position on any bike from a physical-fitment and orientation standpoint...........except for the special extra-tall plug caps used on the XJ700-X and XJ750-X models, which are unique and should not be substituted for by any other original caps.

Although not the original supplier to Yamaha in the era of XJ models, NGK offers an affordable line of quality constructed SPARK PLUG CAPS that will properly replace the original Tokia Denso ("TD") caps that your bike came equipped with from the factory. NGK caps are available in a variety of different styles (height, resistive value, and upper end bend-angles, etc.) that are summarized below.

Most NGK caps have a shiny black thermo-plastic housing, which of course makes them easy to distinguish from the original dull-black Tokia Denso ("TD") plugs caps.


XJ550, 1984-85 FJ600, 1986-88 FZ600, 1986-90 YX600 Radian, 1992-98 XJ600 Seca II, XJ700-X, XJ750-X, and XJ900 S/SH models:

NOTE: all XJ700-X, XJ750-X, and XJ900 S/SH models used extra-tall "kyscraper” plug caps on all 4 cylinders, while XJ550 and 600cc engines used "short" or "medium" height caps on the outer (#1 and #4) cylinders and"taller" caps on the inner (#2 and #3) cylinders.


XJ550, 1984-85 FJ600, 1986-88 FZ600, 1986-90 YX600 Radian, and 1992-98 XJ600 Seca II Outer (#1 & #4) Cylinders:

NOTE: all XJ550 and 600cc engines originally used 10K resistance value plug caps on all four cylinders. You can use either the OEM or replacement 10K resistive caps and non-resistive plugs, or 5K caps along with 5K resistive plugs in order to maintain the original 10K per plug + cap resistance rating.


HCP7441 OEM SPARK PLUG CAP, bent-tip T-135 caps for 12mm "D" plugs with a threaded stud on top. These are the original 10K ohm, 1-3/4" tall caps with the 90-degree bent tip and include the black rubber wire and base boot. Correct for use on all XJ550, 1984-85 FJ600, 1986-88 FZ600, and 1986-90 YX600 Radian models on the outer cylinders (#1 and #4), and on all four cylinders on 1992-98 XJ600 Seca II models, but can actually be used on all models in any position. Each:
$ 44.95

HCP7441SET2 OEM SPARK PLUG CAPS, set of 2.
$ 84.95

HCP7441SET4 OEM SPARK PLUG CAPS, set of 4.
$ 159.95



HCP1316 Aftermarket NGK SPARK PLUG CAP, 5K ohms, short 90-degree angled boot, for 12mm "D" plugs with a threaded stud on top. Great replacement for the stock plug caps on the outer (#1 and #4) cylinders on all XJ550, 1984-85 FJ600, 1986-88 FZ600, and 1986-90 YX600 Radian models. Shorter than original caps (1.50" tall for these replacements versus 2.50" tall for the original caps). NOTE:: these caps have less resistance than the stock plug caps used on these models, and the use of resistive plugs is recommended when using these caps. Each:
$ 5.95

HCP1316SET2 Aftermarket NGK SPARK PLUG CAPS, set of 2.
$ 9.95



HCP1322 Aftermarket NGK SPARK PLUG CAP, 5K ohms, medium 120-degree angled boot, for 12mm "D" plugs with a threaded stud on top. Suitable replacement for the stock plug caps on the outer (#1 and #4) cylinders on all XJ550, 1984-85 FJ600, 1986-88 FZ600, and 1986-90 YX600 Radian models. Slightly taller than the original caps, the 120-degree angled plug wire end offers some additional clearance as compared to the stock 60-degree right-angled caps. NOTE: these caps have less resistance than the stock plug caps used on these models, and the use of resistive plugs is recommended when using these caps on these models. Each:
$ 5.95

HCP1322SET2 Aftermarket NGK SPARK PLUG CAPS, set of 2.
$ 9.95



HCP13192 Aftermarket NGK SPARK PLUG CAP, 10K ohms, short 90-degree angled boot, for 12mm "D" plugs with a threaded stud on top. Suitable replacement for the stock plug caps on the outer (#1 and #4) cylinders on XJ550, 1984-85 FJ600, 1986-88 FZ600, 1986-90 YX600 Radian models, and on all four cylinders on 1992-98 XJ600 Seca II models. Shorter than original caps (1.60" tall for these replacements versus 2.50" tall for the original caps) but with a deeper reach than original caps, they will fit and perform properly, and the 90-degree angled plug wire end offers some additional reach as compared to the stock 60-degree right-angled caps. NOTE: these plug caps require the use of an hourglass shaped “terminal nut” on the top threaded stud of the spark plug. Since 10mm and 12mm spark plugs do not include this terminal nut, you will need to purchase the HCP13518 adapter nuts listed below when using these plug caps on nay of these models. Each:
$ 5.95

HCP13192SET2 Aftermarket NGK SPARK PLUG CAPS, set of 2.
$ 9.95

HCP13192SET4 Aftermarket NGK SPARK PLUG CAPS, set of 4.
$ 18.95



HCP13518 Aftermarket spark plug threaded top stud ADAPTER NUT, hour-glass shaped aluminum nut attaches to the threaded stud on the top of the spark plug. Needed when using plug caps designed for 14mm spark plugs on any 12mm "D" series plugs. Use 1 per plug. Can be re-used almost indefinitely from one spark plug to the next. Each:
$ 1.95

HCP13518SET4 Aftermarket spark plug threaded top stud ADAPTER NUTS, set of 4:
$ 4.95



HCP1676 Aftermarket NGK SPARK PLUG CAP, non-resistive (0 ohms), 90-degree angled boot, for 12mm "D" plugs with a threaded stud on top. Can be used as a replacement for applications that require the use of a zero-ohm cap (for example, changing from original non-resistor plugs to resistor plugs). Much shorter (about half the height) of the originals, and especially on the outer (#1 and #4) cylinders, stock plug wires may need to be extended in order to be able to reach these caps. NOTE: these caps have less resistance than the stock plug caps used on these models, and the use of resistive plugs is required when using these caps. Each:
$ 5.95

HCP1676SET2 Aftermarket NGK SPARK PLUG CAPS, set of 2.
$ 9.95

HCP1676SET4 Aftermarket NGK SPARK PLUG CAPS, set of 4.
$ 18.95




XJ550, 1984-85 FJ600, 1986-88 FZ600, 1986-90 YX600 Radian models Inner (#2 & #3) Cylinders:

NOTE: all XJ550 and 600cc engines originally used 10K resistance value plug caps on all four cylinders. You can use either the OEM or replacement 10K resistive caps and non-resistive plugs, or 5K caps along with 5K resistive plugs in order to maintain the original 10K per plug + cap resistance rating.


HCP7440 OEM SPARK PLUG CAP, 10K ohms, bent-tip T-131 caps for 12mm "D" plugs with a threaded stud on top. These are the original 10K ohm, 2-1/2" tall caps with the 60-degree bent tip and include the black rubber wire and base boot. Correct for use on all XJ550, 1984-85 FJ600, 1986-88 FZ600, and 1986-90 YX600 Radian models on all the outer cylinders (#1 and #4), and all XJ900 S/SH, 1984-85 FJ1100, and 1986-87 FJ1200 models on all four cylinders, but can actually be used on all models in any position. Each:
$ 29.95

HCP7440SET2 OEM SPARK PLUG CAPS, set of 2.
$ 57.95

HCP7440SET4 OEM SPARK PLUG CAPS, set of 4.
$ 99.95



HCP1312 Aftermarket NGK SPARK PLUG CAPS, 5K ohms, straight, for 12mm "D" plugs with a threaded stud on top. Recommended as a suitable replacement for all four XJ700-X and XJ750-X plug caps, as the straight-up design helps keep the plug wires off the valve covers, unlike the angled-tip configuration of the original. Can be used on all XJ550, 1984-85 FJ600, 1986-88 FZ600, and 1986-90 YX600 Radian models on the inner cylinders (#2 and #3), and on all four cylinders on all XJ900 S/SH, 1984-85 FJ1100, and 1986-87 FJ1200 models (especially when using aftermarket plug wires and coils). Approximately 3-3/4" tall vs. the 2-3/8" tall originals. NOTE: these caps have less resistance than the stock plug caps used on some models, and the use of resistive plugs is recommended when using these caps. Each:
$ 7.95

HCP1312SET2 Aftermarket NGK SPARK PLUG CAPS, set of 2.
$ 14.95

HCP1312SET4 Aftermarket NGK SPARK PLUG CAPS, set of 4.
$ 24.95



HCP1318 Aftermarket NGK SPARK PLUG CAP, 5K ohms, tall 102-degree angled boot, for 12mm "D" plugs with a threaded stud on top. Although similar in configuration to the original XJ700-X and XJ750-X original plug caps, with the bent-up plug wire tip design, these are much shorter, and thus not recommended for those models. Can be used on all XJ550, 1984-85 FJ600, 1986-88 FZ600, and 1986-90 YX600 Radian models on the inner cylinders (#2 and #3), and on all four cylinders on all XJ900 S/SH, 1984-85 FJ1100, and 1986-87 FJ1200 models (especially when using aftermarket plug wires and coils). Approximately 3-1/4" tall vs. the 2-3/8" tall originals. NOTE: these caps have less resistance than the stock plug caps used on these models, and the use of resistive plugs is recommended when using these caps. Each:
$ 5.95

HCP1318SET2 Aftermarket NGK SPARK PLUG CAPS, set of 2.
$ 9.95

HCP1318SET4 Aftermarket NGK SPARK PLUG CAPS, set of 4.
$ 18.95



HCP13193 Aftermarket NGK SPARK PLUG CAP, 10K ohms, short 90-degree angled boot, for 12mm "D" plugs with a threaded stud on top. Suitable replacement for the stock plug caps on the inner (#2 and #3) cylinders on XJ550 and 1984-85 FJ600 models, and on all four cylinders on 1992-98 XJ600 Seca II, XJ900 S/SH, 1984-85 FJ1100, and 1986-87 FJ1200 models on all cylinders. Slightly shorter and less deep than original caps, they will fit and perform well and the 90-degree angled plug wire end offers enough clearance as compared to the stock 60-degree right-angled caps. NOTE: these plug caps require the use of an hourglass shaped “terminal nut” on the top threaded stud of the spark plug. Since 10mm and 12mm spark plugs do not include this terminal nut, you will need to purchase the HCP13518 adapter nuts listed below when using these plug caps. Each:
$ 5.95

HCP13193SET2 Aftermarket NGK SPARK PLUG CAPS, set of 2.
$ 9.95

HCP13193SET4 Aftermarket NGK SPARK PLUG CAPS, set of 4.
$ 18.95




HCP13518 Aftermarket spark plug threaded top stud ADAPTER NUT, hour-glass shaped aluminum nut attaches to the threaded stud on the top of the spark plug. Needed when using plug caps designed for 14mm spark plugs on any 12mm "D" series plugs. Use 1 per plug. Can be re-used almost indefinitely from one spark plug to the next. Each:
$ 2.95

HCP13518SET4 Aftermarket spark plug threaded top stud ADAPTER NUTS, set of 4:
$ 4.95




HCP1676 Aftermarket NGK SPARK PLUG CAP, non-resistive (0 ohms), 90-degree angled boot, for 12mm "D" plugs with a threaded stud on top. Can be used as a replacement for applications that require the use of a zero-ohm cap (for example, changing from original non-resistor plugs to resistor plugs). Much shorter (about half the height) of the originals, and especially on the outer (#1 and #4) cylinders, stock plug wires may need to be extended in order to be able to reach these caps. NOTE: these caps have less resistance than the stock plug caps used on these models, and the use of resistive plugs is required when using these caps. Each:
$ 5.95

HCP1676SET2 Aftermarket NGK SPARK PLUG CAPS, set of 2.
$ 9.95

HCP1676SET4 Aftermarket NGK SPARK PLUG CAPS, set of 4.
$ 18.95




all XJ700-X, XJ750-X models on all cylinders:

NOTE: all XJ700-X and XJ750-X models originally used 10K resistance value plug caps on all four cylinders. You can use either the OEM 10K resistive caps and non-resistive plugs, or 5K caps along with 5K resistive plugs in order to maintain the original 10K per plug + cap resistance rating.


HCP3168 OEM SPARK PLUG CAP, 10K ohms, straight, for 12mm "D" plugs with a threaded stud on top. These are the original TD-140 10K ohm, extra-tall 5-1/4" caps with the 120-degree bent tip and the distinctive orange rubber base boot as used on all XJ700-X and XJ750-X models, on all four cylinders. Also fits the following models: 1987 FZ700, 1986-87 FZX700 Fazer, 1985-86 and 1988 FZ750, 1987-88 FZR750R, 1994 1996-98 YZF750R, 1987-95 FZR1000, and 1993-94 GTS1000 models. Each:
$ 89.95

HCP3168SET2 OEM OEM SPARK PLUG CAPS, set of 2.
$ 169.95

HCP3168SET4 OEM OEM SPARK PLUG CAPS, set of 4.
$ 299.95



HCP1312 Aftermarket NGK SPARK PLUG CAPS, 5K ohms, straight, for 12mm "D" plugs with a threaded stud on top. Recommended as a suitable replacement for all four XJ700-X and XJ750-X plug caps, as the straight-up design helps keep the plug wires off the valve covers, unlike the angled-tip configuration of the original. Can be used on all XJ550, 1984-85 FJ600, 1986-88 FZ600, and 1986-90 YX600 Radian models on the inner cylinders (#2 and #3), and on all four cylinders on all XJ900 S/SH, 1984-85 FJ1100, and 1986-87 FJ1200 models (especially when using aftermarket plug wires and coils). Approximately 3-3/4" tall vs. the 5-1/4" tall originals. NOTE: these caps have less resistance than the stock plug caps used on some models, and the use of resistive plugs is recommended when using these caps. Each:
$ 7.95

HCP1312SET2 Aftermarket NGK SPARK PLUG CAPS, set of 2.
$ 14.95

HCP1312SET4 Aftermarket NGK SPARK PLUG CAPS, set of 4.
$ 24.95




XJ900 S/SH models on all cylinders]:

NOTE: all XJ900 S/SH models originally used 10K resistance value plug caps on all four cylinders. You can use either the OEM or replacement 10K resistive caps and non-resistive plugs, or 5K caps along with 5K resistive plugs in order to maintain the original 10K per cylinder (plug + cap) resistance rating.


HCP7440 OEM SPARK PLUG CAP, 10K ohms, bent-tip T-131 caps for 12mm "D" plugs with a threaded stud on top. These are the original 10K ohm, 2-1/2" tall caps with the 60-degree bent tip and include the black rubber wire and base boot. Correct for use on all XJ550, 1984-85 FJ600, 1986-88 FZ600, and 1986-90 YX600 Radian models on all the outer cylinders (#1 and #4), and all XJ900 S/SH, 1984-85 FJ1100, and 1986-87 FJ1200 models on all four cylinders, but can actually be used on all models in any position. Each:
$ 29.95

HCP7440SET2 OEM SPARK PLUG CAPS, set of 2.
$ 57.95

HCP7440SET4 OEM SPARK PLUG CAPS, set of 4.
$ 99.95



HCP1312 Aftermarket NGK SPARK PLUG CAPS, 5K ohms, straight, for 12mm "D" plugs with a threaded stud on top. Recommended as a suitable replacement for all four XJ700-X and XJ750-X plug caps, as the straight-up design helps keep the plug wires off the valve covers, unlike the angled-tip configuration of the original. Can be used on all XJ550, 1984-85 FJ600, 1986-88 FZ600, and 1986-90 YX600 Radian models on the inner cylinders (#2 and #3), and on all four cylinders on all XJ900 S/SH, 1984-85 FJ1100, and 1986-87 FJ1200 models (especially when using aftermarket plug wires and coils). Approximately 3-3/4" tall vs. the 2-1/2" tall originals. NOTE: these caps have less resistance than the stock plug caps used on some models, and the use of resistive plugs is recommended when using these caps. Each:
$ 7.95

HCP1312SET2 Aftermarket NGK SPARK PLUG CAPS, set of 2.
$ 14.95

HCP1312SET4 Aftermarket NGK SPARK PLUG CAPS, set of 4.
$ 24.95



HCP13193 Aftermarket NGK SPARK PLUG CAP, 10K ohms, short 90-degree angled boot, for 12mm "D" plugs with a threaded stud on top. Suitable replacement for the stock plug caps on the inner (#2 and #3) cylinders on XJ550 and 1984-85 FJ600 models, and on all four cylinders on 1992-98 XJ600 Seca II, XJ900 S/SH, 1984-85 FJ1100, and 1986-87 FJ1200 models on all cylinders. Slightly shorter and less deep than original caps, they will fit and perform well and the 90-degree angled plug wire end offers enough clearance as compared to the stock 60-degree right-angled caps. NOTE: these plug caps require the use of an hourglass shaped “terminal nut” on the top threaded stud of the spark plug. Since 12mm spark plugs do not include this terminal nut, you will need to purchase the HCP13518 adapter nut listed below when using these plug caps. Each:
$ 5.95

HCP13193SET2 Aftermarket NGK SPARK PLUG CAPS, set of 2.
$ 9.95

HCP13193SET4 Aftermarket NGK SPARK PLUG CAPS, set of 4.
$ 18.95




HCP13518 Aftermarket spark plug threaded top stud ADAPTER NUT, hour-glass shaped aluminum nut attaches to the threaded stud on the top of the spark plug. Needed when using plug caps designed for 14mm spark plugs on any 12mm "D" series plugs. Use 1 per plug. Can be re-used almost indefinitely from one spark plug to the next. Each:
$ 2.95

HCP13518SET4 Aftermarket spark plug threaded top stud ADAPTER NUTS, set of 4:
$ 4.95




1984-85 FJ1100 and 1986-87 FJ1200 models:

HCP7440 OEM SPARK PLUG CAP, 10K ohms, bent-tip T-131 caps for 12mm "D" plugs with a threaded stud on top. These are the original 10K ohm, 2-1/2" tall caps with the 60-degree bent tip and include the black rubber wire and base boot. Correct for use on all XJ550, 1984-85 FJ600, 1986-88 FZ600, and 1986-90 YX600 Radian models on all the outer cylinders (#1 and #4), and all XJ900 S/SH, 1984-85 FJ1100, and 1986-87 FJ1200 models on all four cylinders, but can actually be used on all models in any position. Each:
$ 29.95

HCP7440SET2 OEM SPARK PLUG CAPS, set of 2.
$ 57.95

HCP7440SET4 OEM SPARK PLUG CAPS, set of 4.
$ 99.95



HCP1318 Aftermarket NGK SPARK PLUG CAP, 5K ohms, tall 102-degree angled boot, for 12mm "D" plugs with a threaded stud on top. Although similar in configuration to the original XJ700-X and XJ750-X original plug caps, with the bent-up plug wire tip design, these are much shorter, and thus not recommended for those models. Can be used on all XJ550, 1984-85 FJ600, 1986-88 FZ600, and 1986-90 YX600 Radian models on the inner cylinders (#2 and #3), and on all four cylinders on all XJ900 S/SH, 1984-85 FJ1100, and 1986-87 FJ1200 models (especially when using aftermarket plug wires and coils). Approximately 3-1/4" tall vs. the 2-1/2" tall originals. NOTE: these caps have less resistance than the stock plug caps used on these models, and the use of resistive plugs is recommended when using these caps. Each:
$ 5.95

HCP1318SET2 Aftermarket NGK SPARK PLUG CAPS, set of 2.
$ 9.95

HCP1318SET4 Aftermarket NGK SPARK PLUG CAPS, set of 4.
$ 18.95



HCP13193 Aftermarket NGK SPARK PLUG CAP, 10K ohms, short 90-degree angled boot, for 12mm "D" plugs with a threaded stud on top. Suitable replacement for the stock plug caps on the inner (#2 and #3) cylinders on XJ550 and 1984-85 FJ600 models, and on all four cylinders on 1992-98 XJ600 Seca II, XJ900 S/SH, 1984-85 FJ1100, and 1986-87 FJ1200 models on all cylinders. Slightly shorter and less deep than original caps, they will fit and perform well and the 90-degree angled plug wire end offers enough clearance as compared to the stock 60-degree right-angled caps. NOTE: these plug caps require the use of an hourglass shaped “terminal nut” on the top threaded stud of the spark plug. Since 12mm spark plugs do not include this terminal nut, you will need to purchase the HCP13518 adapter nut listed below when using these plug caps. Each:
$ 5.95

HCP13193SET2 Aftermarket NGK SPARK PLUG CAPS, set of 2.
$ 9.95

HCP13193SET4 Aftermarket NGK SPARK PLUG CAPS, set of 4.
$ 18.95




HCP13518 Aftermarket spark plug threaded top stud ADAPTER NUT, hour-glass shaped aluminum nut attaches to the threaded stud on the top of the spark plug. Needed when using plug caps designed for 14mm spark plugs on any 12mm "D" series plugs. Use 1 per plug. Can be re-used almost indefinitely from one spark plug to the next. Each:
$ 1.95

HCP13518SET4 Aftermarket spark plug threaded top stud ADAPTER NUTS, set of 4:
$ 4.95




all XJ650, XJ700 non-X, XJ750 non-X all, XJ900RK, RL, N/FN, and F models, XJ1100, and all XS1100 models:

NOTE: all of these models used "short" or "medium" height caps on the outer (#1 and #4) cylinders and the "tall" caps on the inner (#2 and #3) cylinders.

NOTE: all XJ650, XJ700 non-X, XJ750 non-X, XJ900RK, RL, N/FN, and F models, XJ1100, and all XS1100 models originally used 5K resistance value plug caps on all four cylinders. You can use either the OEM or replacement 5K resistive caps and non-resistive plugs, or 0K non-resistive caps along with 5K resistive plugs in order to maintain the original 5K per cylinder (plug + cap) resistance rating

NOTE: NOTE: some sources specify that XJ650 models, XJ750 air-cooled models, and XJ900, XJ1100 and XS1100 models used 5K caps on the outer plug (#1 and #4), and 10K caps on the inner plugs (cylinders #2 and #3). Other sources say that all 4 caps were 5K ohms. And other sources say that 10K caps were used on the outer cylinders (#1 and #4), while the two center cylinders use 10K caps…….whew! This conflicting information from a variety of sources can lead to quite a bit of confusion. Our recommendation is to use 5K caps on all 4 cylinders.

Of course, if you wish to experiment (to see if there is any meaningful performance enhancements in doing so) and increase the resistance (from 5K to 10K) on the two center cylinders (or the two outer cylinders, depending on who you choose to believe…..), you can do so by the following methods:

a) use the stock non-resistive spark plugs on all 4 cylinders, and use 5K caps on the outer cylinders and 10K caps on the inner cylinders.

b) use stock non-resistive spark plugs on the outer cylinders, and resistive (5K) spark plugs on the center cylinders, and then use 5K caps on all plug wires.



all XJ650, XJ700 non-X, XJ750 non-X, XJ900RK, RL, N/FN, and F models, XJ1100, and all XS1100 outer (#1 & #4) Cylinders:

HCP7437 OEM SPARK PLUG CAP, bent-tip T-134 caps for 14mm "B" plugs with a threaded stud on top. These are the original 5K ohm, 1-3/8" tall caps with the 90-degree bent tip and include the black rubber wire and base boot. Correct for use on all air-cooled XJ650, XJ700, 1981-83 XJ750, XJ750-D, XJ750RL, XJ900 RK, RL, N/FN, and F models, XJ1100, and all XS1100 models on the outer cylinders (#1 and #4), but can actually be fitted on all models in any position. Each:
$ discontinued

HCP7437SET2 OEM SPARK PLUG CAPS, set of 2.
$ discontinued



HCP1304 Aftermarket NGK SPARK PLUG CAPS, 5K ohms, short 90-degree angled boot, for 14mm "B" plugs with a threaded stud on top. Great replacement for the stock plug caps on the outer (#1 and #4) cylinders. Slightly taller than original caps (1.5" tall for these replacements versus 1.3" tall for the originals). Each:
$ 5.95

HCP1304SET2 Aftermarket NGK SPARK PLUG CAPS, set of 2.
$ 9.95



HCP1308 Aftermarket NGK SPARK PLUG CAPS, 5K ohms, short 120-degree angled boot, for 14mm "B" plugs with a threaded stud on top. Suitable replacement for the stock plug caps on the outer (#1 and #4) cylinders. Slightly taller than original caps (2.0" tall for these replacements versus 1.3" tall for the originals), and the 120-degree angled plug wire end offers some additional clearance as compared to the stock 90-degree right-angled caps. Each:
$ 5.95

HCP1308SET2 Aftermarket NGK SPARK PLUG CAPS, set of 2.
$ 9.95



HCP1310 Aftermarket NGK SPARK PLUG CAP, 5K ohms, medium 120-degree angled boot, for 14mm "B" plugs with a threaded stud on top. Suitable replacement for the stock plug caps on the outer (#1 and #4) cylinders. Slightly taller than original caps (2.4" tall for these replacements versus 1.3" tall for the originals), and the 120-degree angled plug wire end offers some additional clearance as compared to the stock 90-degree right-angled caps. Each:
$ 5.95

HCP1310SET2 Aftermarket NGK SPARK PLUG CAPS, set of 2.
$ 9.95



HCP1676 Aftermarket NGK SPARK PLUG CAP, non-resistive (0 ohms), 90-degree angled boot, for 14mm "B" plugs with a threaded stud on top. Can be used as a replacement for applications that require the use of a zero-ohm cap (for example, changing from original non-resistor plugs to resistor plugs). Much shorter (about half the height) of the originals, and especially on the outer (#1 and #4) cylinders, stock plug wires may need to be extended in order to be able to reach these caps. NOTE: these caps have less resistance than the stock plug caps used on these models, and the use of resistive plugs is recommended when using these caps. Each:
$ 5.95

HCP1676SET2 Aftermarket NGK SPARK PLUG CAPS, set of 2.
$ 9.95

HCP1676SET4 Aftermarket NGK SPARK PLUG CAPS, set of 4.
$ 18.95




all XJ650, XJ700 non-X, XJ750 non-X, XJ900RK, RL, N/FN, and F models, XJ1100, and all XS1100 inner (#2 & #3) Cylinders:

NOTE: all XJ650, XJ700 non-X, XJ750 non-X, XJ900RK, RL, N/FN, and F models, XJ1100, and all XS1100 models originally used 5K resistance value plug caps on all four cylinders. You can use either the OEM or replacement 5K resistive caps and non-resistive plugs, or 0K non-resistive caps along with 5K resistive plugs in order to maintain the original 5K per plug + cap resistance rating.


HCP7436 OEM SPARK PLUG CAP, bent-tip T-133 caps for 14mm "B" plugs with a threaded stud on top. These are the original 5K ohm, 2-1/2" tall caps with the 90-degree bent tip and include the black rubber wire and base boot. Correct for use on all air-cooled XJ650, XJ700, 1981-83 XJ750, XJ750-D, XJ750RL, XJ900 RK, RL, N/FN, and F models, XJ1100, and all XS1100 models on the inner cylinders (#2 and #3), but can actually be fitted on all models in any position. Each:
$ 69.95

HCP7436SET2 OEM SPARK PLUG CAPS, set of 2.
$ 134.95




HCP7440 OEM SPARK PLUG CAP, 10K ohms, bent-tip T-131 caps for spark plugs with a threaded stud on top. These are the original 10K ohm, 2-1/2" tall caps with the 60-degree bent tip and include the black rubber wire and base boot. Correct for use on all XJ550, 1984-85 FJ600, 1986-88 FZ600, and 1986-90 YX600 Radian models on all the outer cylinders (#1 and #4), and all XJ900 S/SH, 1984-85 FJ1100, and 1986-87 FJ1200 models on all four cylinders, but can actually be used on all models in any position. NOTE: some sources specify that XJ650 models, XJ750 air-cooled models, and XJ900, XJ1100 and XS1100 models used 5K caps on the outer plug (#1 and #4), and 10K caps on the inner plugs (cylinders #2 and #3). Additionally, it is noted that non-North American models would indeed use 5K caps on all four cylinders. This conflicting information from a variety of sources can lead to quite a bit of confusion. Our recommendation is to use 5K caps on all 4 cylinders. Of course, if you wish to experiment (to see if there is any meaningful performance enhancements in doing so) and increase the resistance (from 5K to 10K) on the two center cylinders, you can do so by using these caps on the inner cylinders. Each:
$ 29.95

HCP7440SET2 OEM SPARK PLUG CAPS, set of 2.
$ 57.95



HCP13193 Aftermarket NGK SPARK PLUG CAP, 10K ohms, short 90-degree angled boot, for spark plugs with a threaded stud on top. Suitable replacement for the stock plug caps on the inner (#2 and #3) cylinders on XJ550 and 1984-85 FJ600 models, and on all four cylinders on 1992-98 XJ600 Seca II, XJ900 S/SH, 1984-85 FJ1100, and 1986-87 FJ1200 models on all cylinders. Slightly shorter and less deep than original caps, they will fit and perform well and the 90-degree angled plug wire end offers enough clearance as compared to the stock 60-degree right-angled caps. NOTE: some sources specify that XJ650 models, XJ750 air-cooled models, and XJ900, XJ1100 and XS1100 models used 5K caps on the outer plug (#1 and #4), and 10K caps on the inner plugs (cylinders #2 and #3). Additionally, it is noted that non-North American models would indeed use 5K caps on all four cylinders. This conflicting information from a variety of sources can lead to quite a bit of confusion. Our recommendation is to use 5K caps on all 4 cylinders. Of course, if you wish to experiment (to see if there is any meaningful performance enhancements in doing so) and increase the resistance (from 5K to 10K) on the two center cylinders, you can do so by using these caps on the inner cylinders. Each:
$ 5.95

HCP13193SET2 Aftermarket NGK SPARK PLUG CAPS, set of 2.
$ 9.95



HCP1306 Aftermarket NGK SPARK PLUG CAP, 5K ohms, tall 102-degree angled boot, for 14mm "B" plugs with a threaded stud on top. Recommended on the inner cylinders (#2 and #3) as replacements for the non-available tall 90-degree tip caps. Approx. 3.25" tall vs. the 2.5" tall originals. Each:
$ 8.95

HCP1306SET2 Aftermarket NGK SPARK PLUG CAPS, set of 2.
$ 16.95



HCP1300 Aftermarket NGK SPARK PLUG CAP, 5K ohms, straight, for 14mm "B" plugs with a threaded stud on top. Can be used on inner cylinders (#2 and #3) as replacements, especially when using aftermarket plug wires and coils. Approx. 3" tall vs. the 2.5" tall originals. Each:
$ 19.95

HCP1300SET2 Aftermarket NGK SPARK PLUG CAPS, set of 2.
$ 36.95



HCP1676 Aftermarket NGK SPARK PLUG CAP, non-resistive (0 ohms), 90-degree angled boot, for 14mm "B" plugs with a threaded stud on top. Can be used as a replacement for applications that require the use of a zero-ohm cap (for example, changing from original non-resistor plugs to resistor plugs). Much shorter (about half the height) of the originals, and especially on the outer (#1 and #4) cylinders, stock plug wires may need to be extended in order to be able to reach these caps. NOTE: these caps have less resistance than the stock plug caps used on these models, and the use of resistive plugs is recommended when using these caps. Each:
$ 5.95

HCP1676SET2 Aftermarket NGK SPARK PLUG CAPS, set of 2.
$ 9.95

HCP1676SET4 Aftermarket NGK SPARK PLUG CAPS, set of 4.
$ 18.95




Replacement Rubber Boots for Original Tokia Denso ("TD") Spark Plug Caps:

For rebuilding purposes, we have the original style black rubber PLUG-WIRE BOOTS and CAP BASE-TO-SPARKPLUG-BODY BOOTS that fit onto the original Tokia Denso spark plug caps and seal (both against the environment and "electrically") the plug wire from the coils (this is the "plug-wire" boot, at the upper end of the plug cap) and the plug cap to the spark plug body (this is the "plug-end" boot at the lower end of the plug cap).


HCP13508 Aftermarket black rubber PLUG-WIRE BOOTS, almost identical in appearance to the original boot used on all XJ-series original plug caps except on the HCP7437 cap (which uses the HCP13509 boot below). Will accept up to 8mm plug wire, and is molded from a very dense, thick-walled rubber material like original. Can also be used on the HCP7437 cap if desired. Each:
$ 2.50

HCP13509 Aftermarket black rubber PLUG-WIRE BOOT, almost identical in appearance to the original boot used on the HCP7437 cap. Will accept up to 8mm plug wire, and is molded from a thin-wall rubber material like original. Can also be used on the HCP7436, HCP7440, HCP7441, and HCP3168 original caps if desired. Each:
$ 2.50



HCP13501 Aftermarket black rubber CAP BASE-TO-SPARK PLUG BOOT, very similar in appearance to the original boot used on all XJ-series original plug caps except on the HCP3168 cap (XJ700-X and XJ750-X). Although the original plug-body boots actually came in a variety of similar-but-different sizes and configurations, this replacement is molded from a very dense, thick-walled rubber material like original, and will fit and seal like an original. Each:
$ 2.95

HCP13510 Aftermarket black rubber CAP BASE-TO-SPARK PLUG BOOT, will fit on all original plug caps used on all XJ-series models except on the HCP3168 cap (XJ700-X and XJ750-X). This replacement is smaller and is molded from a thinner-walled rubber material than original, but it will fit and seal as tightly as an original. Each:
$ 2.95



Replacement Resistors for Original Tokia Denso Spark Plug Caps:

If you would like to keep your (otherwise) good condition original plug caps, you can rebuild the ones which are marked TD-131, TD-135, and TD-140 (the TD-133 caps can be rebuilt, but we do not have the correct 5K ohm resistor to fit it, and the TD-134 caps cannot be rebuilt) by replacing the internal RESISTOR CORE, the thin resistor SPRING SEAT DISC, and cleaning the TENSION SPRING and the screw-in brass cap PLUG.

http://faq.f650.com/FAQs/Photos/ElecPhotos/PlugCapUndone.jpg

http://faq.f650.com/FAQs/Photos/ElecPhotos/PlugCapUndo.jpg


Always remember, that if you replace an original resistor with a core of lesser-value resistance, you should "make-up" the difference in electrical resistance via the use of resistor plugs.


HCP13232 Aftermarket 5K ohm CERAMIC RESISTOR, can be used to replace the original internal plug cap resistor on all TD-140 plug caps. This replacement resistor is slightly longer (5mm) than an original resistor, and thus the tension spring or the brass screw-in brass cap plug will need to be shortened by an equal amount for proper fitment. If using this resistor on XJ700-X and XJ750-X models---which originally used a 10K resistor---you should also switch from non-resistor spark plugs to resistor plugs to make up the difference in total system resistance. Use 1 per cap. Each:
$ 5.95

HCP13233 Aftermarket 10K ohm CERAMIC RESISTOR, can be used to replace the original internal plug cap 10K resistor on all TD-140 plug caps on XJ700-X and XJ750-X models. This replacement resistor is slightly longer (5mm) than an original resistor, and thus the tension spring or the brass screw-in brass cap plug will need to be shortened by an equal amount for proper fitment. Use 1 per cap. Each:
$ 5.95

HCP13604 Aftermarket 10K ohm CERAMIC RESISTOR, can be used to replace the original internal plug cap 10K resistor on all T-131, T-135, and T-140 plug caps on XJ550, XJ700-X, and XJ750-X models. This replacement resistor is 3.5mm shorter than an original resistor, and thus the HCP16191 spacer below will need to be used to take up the extra distance for proper fitment. Use 1 per cap. Each:
$ 4.95

HCP16191 Aftermarket plug cap resistor SPACER DISC, this 3.5mm thick, non-resistive copper disc should be used with the HCP13604 resistor above in order to create a proper fit within the cap. Use 1 per cap. Each:
$ 2.50



HCP13115 Aftermarket plug cap resistor SPRING SEAT DISC, this thin, non-resistive copper disc fits between the end of the resistor and the tension spring. Even in otherwise "good" original caps, this disc can become "eaten away" over time due to the large current passing through it, and should be replaced, as it (rather than the resistor) may be the cause of an "out-of-spec" plug cap resistance reading. Use 1 per cap. Each:
$ 1.95



HCP13105 Aftermarket plug cap RESISTOR ELIMINATOR. This solid, zero-resistance, oxygen-free copper rod replaces the original resistor, thus creating a zero-resistance cap that will last "almost forever" at this level of electrical resistance. When using this resistor-eliminator rod, you should also switch from non-resistor spark plugs to resistor plugs to make up the difference in total system resistance. Since you normally replace spark plugs fairly regularly anyway, it can make sense to use a zero-resistance cap and resistor plugs, rather than a 5K resistor cap and zero-resistance plugs. For use in all of the following original style caps:

T-131: used on all XJ550 models on all the inner cylinders (#2 and #3), and on all XJ900 S/SH models on all four cylinders.
T-133: used on all air-cooled XJ650, XJ700, 1981-83 XJ750, XJ750-D, XJ750RL, XJ900 RK, RL, N/FN, and F models, and XJ1100 models on the inner cylinders (#2 and #3).
T-135: used on all XJ550 models on all the outer cylinders (#1 and #4).
T-140: used on all XJ700-X and XJ750-X models on all fours cylinders.

Use 1 per cap. Each:
$ 3.95



SPARK PLUGS AND PLUG TOOLS:

Spark Plugs:

Original SPARK PLUGS on all XJ-series bike were the NGK brand. Although many other brands of plugs can be cross-referenced to the originals, NGK plugs offer both value and performance that is quite satisfactory, in both the original stock performance configurations, and in replacement standard or high-performance, platinum-tipped IRIDIUM IX resistive design plugs. All non-resistor plugs have zero ohms resistance, while all resistor plugs.....those with the letter "R" in their part number.....have a resistance rating of 5K (5,000) ohms.

Although spark plugs are pretty cheap (and thus it's not too hard on the wallet to replace plugs with new ones as part of an ignition system troubleshooting routine), if you want to actually check their condition, here's how you do it:



NOTE 1: some original and replacement plug caps are designed to be used on spark plugs that have their screw-on insulator stud top cap NUT removed, while other caps require that the cap nut remain in place. The following NGK plugs that we offer come with the threaded top cap installed onto the upper terminal (HCP1290, HCP1291, HCP1292, HCP1293, HCP1294, HCP1295, HCP13512, and HCP13515) and it may need to be removed before installation (depending on which plug caps you are using). You may find that you'll need a pair of pliers to grip the outside of the "nut" to break it loose, and then just unscrew it.

If your plug caps DO require the use of a cap nut, and your plugs do NOT come with a cap nut, you can either remove (and re-use) the cap nuts from your old plugs, or purchase replacement cap nuts from us using part number HCP13518:

HCP13518 Aftermarket spark plug threaded top stud ADAPTER NUT, hour-glass shaped aluminum nut attaches to the threaded stud on the top of the spark plug. Needed when using plug caps designed for 14mm spark plugs on any 12mm "D" series plugs. Use 1 per plug. Can be re-used almost indefinitely from one spark plug to the next. Each:
$ 1.25

HCP13518SET4 Aftermarket spark plug threaded top stud ADAPTER NUTS, set of 4:
$ 3.75



NOTE 2: NGK plugs that begin with the letter "B" are 14mm plugs. Plugs that begin with the letter "D" are 12mm plugs. If the letter "R" appears within the plug model code, then it is a resistive plug, with resistive values being 5K ohms. When replacing an original non-resistive plug with any type of resistive plug, it is advisable to make a likewise reduction in the value of the resistive spark plug caps so that the entire plug circuit retains the same resistance as original.

EXAMPLE: 1982 XJ650 Maxim models originally used the HCP1292 non-resistive (zero ohms) BP7ES spark plugs, along with 5,000 (5K) ohm plug caps on each plug. If you substitute a resistive plug (such as the HCP1293 Iridium plugs, or any other resistive plug) for the original non-resistive plug, then your spark plug + plug cap total resistance will increase from the original 5,000 (5K) ohms to 10,000 (10K) ohms. Either level of resistance will work okay; in fact, some engines were originally equipped with 5K resistance ca[s on the outer cylinders, and 10K resistance caps on the inner 2 cylinders, with the theory being that since the center cylinders run a bit hotter than the outer cylinders, the extra resistance (which creates a longer spark discharge time) will help to fire those hotter cylinders more reliably under high loads.....but the difference is basically un-noticeable under most street-driven conditions. Our recommendation, for a variety of reasons, is to achieve the same secondary resistance across all 4 cylinders, whether it is via the stock set-up (resistive caps and non-resistive spark plugs) or for some engines, a combination of resistive caps and resistive plugs (for example, 1986 XJ700 engines and 1985-up XJ900 engines).


Recommended spark plug gaps:

NOTE: you should never gap nor re-gap the high-performance Iridium spark plugs! All of the gapping information below pertains only to standard spark plugs. On Iridium plugs, always leave their gap "as-is" when they are removed from their box and for evermore!!

On all engines equipped with non-Iridium plugs, you can experiment with plug gaps to try and increase performance slightly. Typically, opening up the gap slightly improves high-load and high-rpm performance; in fact, the ability to run larger plug gaps is the real reason why you should consider using high-output ignition coils…..they have the extra voltage needed to successfully bridge larger plug gaps than the stock coils do.

http://www.motorcycleproject.com/text/high_perf_ignition_coils.html


The stock gaps are given below. One user reports better overall performance on their XJ700-X (water-cooled engine) with the gap set at .048” (rather than the stock .028”).

0.60 - 0.70mm (0.024 - 0.028")
- all XJ550 engines
- all XJ700-X and XJ750-X engines

0.70 - 0.80mm (0.028 - 0.032")
- all XJ650 engines
- all XJ700 air-cooled engines
- all XJ750 air-cooled engines
- all XJ900 engines
- all XJ1100 engines

The recommended service interval for spark plugs calls for their replacement every 7,500 miles. Spark plugs should be torqued to 14 foot-pounds on all XJ models except the water-cooled XJ700-X and XJ750-X models, which only require 12 foot-pounds of torque.


Spark plug knowledge you can use:

Reading spark plugs:

http://www.motorcycleproject.com/text/reading_plugs.html

and

http://www.wallaceracing.com/plug-reading-lm.html


Spark plug heat ranges and plug etiquette:

http://www.motorcycleproject.com/text/spark_plug_facts.html


Believe it or not, there’s actually quite a bit of information on the proper installation and use of spark plugs that is not generally known or appreciated. A few minutes review can prevent a world of hurt, aka Don’t Lose Your Head!:

http://www.bmwmotorcycletech.info/sparkplugs.htm


XJ550, 1984-85 FJ600, 1986-88 FZ600, and 1986-90 YX600 engines:

HCP1296 Original D8EA NGK SPARK PLUG, stock non-resistive plug is correct for all XJ550, 1984-85 FJ600, 1986-88 FZ600, 1986-90 YX600 Radian, and 1985 XJ700-X models. Each:
$ 4.95

HCP1296SET4 Original D8EA NGK SPARK PLUGS, set of 4.
$ 18.95


HCP13514 Standard replacement DR8EA NGK SPARK PLUG, 5K ohms resistive plug for all XJ550, 1984-85 FJ600, 1986-88 FZ600, 1986-90 YX600 Radian models. NOTE: it is recommend that when you use these resistive plugs (in place of the stock non-resistive plugs) that you also reduce the resistance value of the spark plug CAP by 5K ohms in order to keep your total secondary path resistance at the original value. Each:
$ 4.95

HCP13514SET4 Standard replacement DR8EA NGK SPARK PLUGS, set of 4.
$ 18.95


HCP1297 High-performance replacement NGK IRIDIUM SPARK PLUG, DR8EIX 5K ohms resistive plug for all XJ550, 1984-85 FJ600, 1986-88 FZ600, 1986-90 YX600 Radian, XJ700-X, and XJ750-X models. NOTE: Iridium plugs should not be gapped, they are designed to be used "as is" out of the box. Attempting to gap/re-gap these plugs can and may result in electrode breakage! However, users have reported slightly increased performance when the cap on these type plugs is set to about .055". Also, because of their design, the color of the ceramic insulator around the center electrode will typically not show much color change as is common on standard plugs, and thus the ceramic color cannot be counted on to reveal mixture condition (i.e. lean or rich) accurately. NOTE: it is recommend that when you use these resistive plugs (in place of the stock non-resistive plugs) that you also reduce the resistance value of the spark plug CAP by 5K ohms in order to keep your total secondary path resistance at the original value. Each:
$ 14.95

HCP1297SET4 High-performance replacement NGK IRIDIUM SPARK PLUGS, set of 4.
$ 54.95



XJ600 Seca II engines:

HCP20107 Original CR8E NGK SPARK PLUG, stock resistive plug is correct for all XJ600 Seca II models. Each:
$ 7.95

HCP20107SET4 Original BP7ES NGK SPARK PLUGS, set of 4.
$ 29.95


HCP20355 High-performance replacement NGK IRIDIUM SPARK PLUG, CR8EIX 5K ohms resistive plug for all XJ00 Seca II models. NOTE: Iridium plugs should not be gapped, they are designed to be used "as is" out of the box. Attempting to gap/re-gap these plugs can and will likely result in electrode breakage! Also, because of their design, the color of the ceramic insulator around the center electrode will typically not show much color change as is common on standard plugs, and thus the ceramic color cannot be counted on to reveal mixture condition (i.e. lean or rich) accurately. Each:
$ 14.95

HCP20355SET4 High-performance replacement NGK IRIDIUM SPARK PLUGS, set of 4.
$ 54.95



XJ650 engines:

HCP1292 Original BP7ES NGK SPARK PLUG, stock non-resistive plug is correct for all XJ650 (except Turbo) models. Each:
$ 9.95

HCP1292SET4 Original BP7ES NGK SPARK PLUGS, set of 4.
$ 38.95


HCP13513 Standard replacement BPR7ES NGK SPARK PLUG, 5K ohms resistive plug for all XJ650 (except Turbo) models. NOTE: it is recommend that when you use these resistive plugs (in place of the stock non-resistive plugs) that you also reduce the resistance value of the spark plug CAP by 5K ohms in order to keep your total secondary path resistance at the original value. NOTE: this spark plug has a non-removable "cap nut" which restricts its use to only certain spark plug caps. Each:
$ 4.95

HCP13513SET4 Standard replacement BPR7ES NGK SPARK PLUGS, set of 4.
$ 18.95


HCP1293 High-performance replacement NGK IRIDIUM SPARK PLUG, BPR7EIX 5K ohms resistive plug for all XJ650 (except Turbo) models. NOTE: Iridium plugs should not be gapped, they are designed to be used "as is" out of the box. Attempting to gap/re-gap these plugs can and will likely result in electrode breakage! Also, because of their design, the color of the ceramic insulator around the center electrode will typically not show much color change as is common on standard plugs, and thus the ceramic color cannot be counted on to reveal mixture condition (i.e. lean or rich) accurately. NOTE: it is recommend that when you use these resistive plugs (in place of the stock non-resistive plugs) that you also reduce the resistance value of the spark plug CAP by 5K ohms in order to keep your total secondary path resistance at the original value. Each:
$ 14.95

HCP1293SET4 High-performance replacement NGK IRIDIUM SPARK PLUGS, set of 4.
$ 54.95




HCP1294 Original BP8ES NGK SPARK PLUG, stock non-resistive plug is correct for all XJ650 Turbo models. Each:
$ 8.95

HCP1294SET4 Original BP8ES NGK SPARK PLUGS, set of 4.
$ 32.95


HCP1295 Standard replacement BPR8ES NGK SPARK PLUG, 5K ohms resistive plug for all XJ650 Turbo models. NOTE: it is recommend that when you use these resistive plugs (in place of the stock non-resistive plugs) that you also reduce the resistance value of the spark plug CAP by 5K ohms in order to keep your total secondary path resistance at the original value. Each:
$ 4.95

HCP1295SET4 Standard replacement BPR8ES NGK SPARK PLUGS, set of 4.
$ 18.95


HCP13515 High-performance replacement NGK IRIDIUM SPARK PLUG, BPR8EIX 5K ohms resistive plug for all XJ650 Turbo models. NOTE: Iridium plugs should not be gapped, they are designed to be used "as is" out of the box. Attempting to gap/re-gap these plugs can and will likely result in electrode breakage! Also, because of their design, the color of the ceramic insulator around the center electrode will typically not show much color change as is common on standard plugs, and thus the ceramic color cannot be counted on to reveal mixture condition (i.e. lean or rich) accurately. NOTE: it is recommend that when you use these resistive plugs (in place of the stock non-resistive plugs) that you also reduce the resistance value of the spark plug CAP by 5K ohms in order to keep your total secondary path resistance at the original value. Each:
$ 14.95

HCP13515SET4 High-performance replacement NGK IRIDIUM SPARK PLUGS, set of 4.
$ 54.95



XJ700 engines:

HCP1294 Original BP8ES NGK SPARK PLUG, stock non-resistive plug is correct for all 1985 XJ700 non-X models. Each:
$ 8.95

HCP1294SET4 Original BP8ES NGK SPARK PLUGS, set of 4.
$ 32.95


HCP1295 Original BPR8ES NGK SPARK PLUG, stock 5K ohms resistive plug is correct for all 1986 XJ700 non-X models. Each:
$ 4.95

HCP1295SET4 Original BPR8ES NGK SPARK PLUGS, set of 4.
$ 18.95


HCP13515 High-performance replacement NGK IRIDIUM SPARK PLUG, BPR8EIX 5K ohms resistive plug for all XJ700 non-X models. NOTE: Iridium plugs should not be gapped, they are designed to be used "as is" out of the box. Attempting to gap/re-gap these plugs can and will likely result in electrode breakage! Also, because of their design, the color of the ceramic insulator around the center electrode will typically not show much color change as is common on standard plugs, and thus the ceramic color cannot be counted on to reveal mixture condition (i.e. lean or rich) accurately. NOTE: it is recommend that when you use these resistive plugs on 1985 model engines (in place of the stock non-resistive plugs) that you also reduce the resistance value of the spark plug CAP by 5K ohms in order to keep your total secondary path resistance at the original value. Each:
$ 14.95

HCP13515SET4 High-performance replacement NGK IRIDIUM SPARK PLUGS, set of 4.
$ 54.95




HCP1296 Original D8EA NGK SPARK PLUG, stock non-resistive plug is correct for all XJ550, 1984-85 FJ600, 1986-88 FZ600, 1986-90 YX600 Radian, and 1985 XJ700-X models. Each:
$ 4.95

HCP1296SET4 Original D8EA NGK SPARK PLUGS, set of 4.
$ 18.95


HCP1298 Original DR8ESL NGK SPARK PLUG, stock 5K ohms resistive plug is correct for all 1986 XJ700-X and XJ750-X models. NOTE: it is recommend that when you use these resistive plugs on 1985 model XJ700-X engines (in place of the stock non-resistive plugs) that you also reduce the resistance value of the spark plug CAP by 5K ohms in order to keep your total secondary path resistance at the original value. Each:
$ 4.95

HCP1298SET4 Original DR8ESL NGK SPARK PLUGS, set of 4.
$ 18.95


HCP13514 Standard replacement DR8EA NGK SPARK PLUG, 5K ohms resistive plug for all XJ550, 1984-85 FJ600, 1986-88 FZ600, 1986-90 YX600 Radian models. Each:
$ 4.95

HCP13514SET4 Standard replacement DR8EA NGK SPARK PLUGS, set of 4.
$ 18.95



HCP1297 High-performance replacement NGK IRIDIUM SPARK PLUG, DR8EIX 5K ohms resistive plug for all XJ550, 1984-85 FJ600, 1986-88 FZ600, 1986-90 YX600 Radian, XJ700-X, and XJ750-X models. NOTE: Iridium plugs should not be gapped, they are designed to be used "as is" out of the box. Attempting to gap/re-gap these plugs can and may result in electrode breakage! However, users have reported slightly increased performance when the cap on these type plugs is set to about .055". Also, because of their design, the color of the ceramic insulator around the center electrode will typically not show much color change as is common on standard plugs, and thus the ceramic color cannot be counted on to reveal mixture condition (i.e. lean or rich) accurately. NOTE: it is recommend that when you use these resistive plugs on 1985 model XJ700-X engines (in place of the stock non-resistive plugs) that you also reduce the resistance value of the spark plug CAP by 5K ohms in order to keep your total secondary path resistance at the original value. Each:
$ 14.95

HCP1297SET4 High-performance replacement NGK IRIDIUM SPARK PLUGS, set of 4.
$ 54.95



XJ750 engines:

HCP1292 Original BP7ES NGK SPARK PLUG, stock non-resistive plug is correct for all 1981-83 XJ750 models, XJ750-D models, and all XJ750 Police (24L and 37H) models. Each:
$ 9.95

HCP1292SET4 Original BP7ES NGK SPARK PLUGS, set of 4.
$ 38.95


HCP13513 Standard replacement BPR7ES NGK SPARK PLUG, 5K ohms resistive plug for all 1981-83 XJ750 models, XJ750-D models, and all XJ750 Police (24L and 37H) models. NOTE: it is recommend that when you use these resistive plugs (in place of the stock non-resistive plugs) that you also reduce the resistance value of the spark plug CAP by 5K ohms in order to keep your total secondary path resistance at the original value. NOTE: this spark plug has a non-removable "cap nut" which restricts its use to only certain spark plug caps. Each:
$ 4.95

HCP13513SET4 Standard replacement BPR7ES NGK SPARK PLUGS, set of 4.
$ 18.95


HCP1293 High-performance replacement NGK IRIDIUM SPARK PLUG, BPR7EIX 5K ohms resistive plug for all 1981-83 XJ750 models, XJ750-D models, and all XJ750 Police (24L and 37H) models. NOTE: Iridium plugs should not be gapped, they are designed to be used "as is" out of the box. Attempting to gap/re-gap these plugs can and will likely result in electrode breakage! Also, because of their design, the color of the ceramic insulator around the center electrode will typically not show much color change as is common on standard plugs, and thus the ceramic color cannot be counted on to reveal mixture condition (i.e. lean or rich) accurately. NOTE: it is recommend that when you use these resistive plugs (in place of the stock non-resistive plugs) that you also reduce the resistance value of the spark plug CAP by 5K ohms in order to keep your total secondary path resistance at the original value. Each:
$ 14.95

HCP1293SET4 High-performance replacement NGK IRIDIUM SPARK PLUGS, set of 4.
$ 54.95




HCP1294 Original BP8ES NGK SPARK PLUG, stock non-resistive plug is correct for all XJ750RL models. Each:
$ 8.95

HCP1294SET4 Original BP8ES NGK SPARK PLUGS, set of 4.
$ 32.95


HCP1295 Standard replacement BPR8ES NGK SPARK PLUG, 5K ohms resistive plug for XJ750RL models. NOTE: it is recommend that when you use these resistive plugs (in place of the stock non-resistive plugs) that you also reduce the resistance value of the spark plug CAP by 5K ohms in order to keep your total secondary path resistance at the original value. Each:
$ 4.95

HCP1295SET4 Standard replacement BPR8ES NGK SPARK PLUGS, set of 4.
$ 18.95


HCP13515 High-performance replacement NGK IRIDIUM SPARK PLUG, BPR8EIX 5K ohms resistive plug for XJ750RL models. NOTE: Iridium plugs should not be gapped, they are designed to be used "as is" out of the box. Attempting to gap/re-gap these plugs can and will likely result in electrode breakage! Also, because of their design, the color of the ceramic insulator around the center electrode will typically not show much color change as is common on standard plugs, and thus the ceramic color cannot be counted on to reveal mixture condition (i.e. lean or rich) accurately. NOTE: it is recommend that when you use these resistive plugs (in place of the stock non-resistive plugs) that you also reduce the resistance value of the spark plug CAP by 5K ohms in order to keep your total secondary path resistance at the original value. Each:
$ 14.95

HCP13515SET4 High-performance replacement NGK IRIDIUM SPARK PLUGS, set of 4.
$ 54.95




HCP1298 Original DR8ESL NGK SPARK PLUG, stock 5K ohms resistive plug is correct for all XJ750-X models. Each:
$ 4.95

HCP1298SET4 Original DR8ESL NGK SPARK PLUGS, set of 4.
$ 18.95


HCP1297 High-performance replacement NGK IRIDIUM SPARK PLUG, DR8EIX 5K ohms resistive plug for all XJ750-X models. NOTE: Iridium plugs should not be gapped, they are designed to be used "as is" out of the box. Attempting to gap/re-gap these plugs can and will likely result in electrode breakage! Also, because of their design, the color of the ceramic insulator around the center electrode will typically not show much color change as is common on standard plugs, and thus the ceramic color cannot be counted on to reveal mixture condition (i.e. lean or rich) accurately. Each:
$ 14.95

HCP1297SET4 High-performance replacement NGK IRIDIUM SPARK PLUGS, set of 4.
$ 54.95



XJ900 engines:

HCP1294 Original BP8ES NGK SPARK PLUG, stock non-resistive plug is correct for all XJ900RK and RL models. Each:
$ 8.95

HCP1294SET4 Original BP8ES NGK SPARK PLUGS, set of 4.
$ 32.95


HCP1295 Original BPR8ES NGK SPARK PLUG, stock 5K ohms resistive plug is correct for all XJ900 N/FN and F models. This plug can also be used as a substitute for the non-resistive plug on XJ900RK and RL engines. NOTE: it is recommend that when you use these resistive plugs (in place of the stock non-resistive plugs on XJ900RK and RL engines) that you also reduce the resistance value of the spark plug CAP by 5K ohms in order to keep your total secondary path resistance at the original value. Each:
$ 4.95

HCP1295SET4 Original BPR8ES NGK SPARK PLUGS, set of 4.
$ 18.95


HCP13515 High-performance replacement NGK IRIDIUM SPARK PLUG, BPR8EIX 5K ohms resistive plug for all XJ900RK, RL, N/FN, and F models. NOTE: Iridium plugs should not be gapped, they are designed to be used "as is" out of the box. Attempting to gap/re-gap these plugs can and will likely result in electrode breakage! Also, because of their design, the color of the ceramic insulator around the center electrode will typically not show much color change as is common on standard plugs, and thus the ceramic color cannot be counted on to reveal mixture condition (i.e. lean or rich) accurately. NOTE: it is recommend that when you use these resistive plugs (in place of the stock non-resistive plugs on XJ900RK and RL engines) that you also reduce the resistance value of the spark plug CAP by 5K ohms in order to keep your total secondary path resistance at the original value. Each:
$ 14.95

HCP13515SET4 High-performance replacement NGK IRIDIUM SPARK PLUGS, set of 4.
$ 54.95



XJ1100 and all XS1100 engines:

HCP1290 Original BP6ES NGK SPARK PLUG, stock non-resistive plug is correct for all XS1100 and XJ1100 models. Each:
$ 9.95

HCP1290SET4 Original BP6ES NGK SPARK PLUGS, set of 4.
$ 38.95


HCP13512 Standard replacement BPR6ES NGK SPARK PLUG, 5K ohms resistive plug for all XS1100 and XJ1100 models. NOTE: it is recommend that when you use these resistive plugs (in place of the stock non-resistive plugs) that you also reduce the resistance value of the spark plug CAP by 5K ohms in order to keep your total secondary path resistance at the original value. Each:
$ 4.95

HCP13512SET4 Standard replacement BPR6ES NGK SPARK PLUGS, set of 4.
$ 18.95


HCP1291 High-performance replacement NGK IRIDIUM SPARK PLUG, BPR6EIX 5K ohms resistive plug for all XS1100 and XJ1100 models. NOTE: Iridium plugs should not be gapped, they are designed to be used "as is" out of the box. Attempting to gap/re-gap these plugs can and will likely result in electrode breakage! Also, because of their design, the color of the ceramic insulator around the center electrode will typically not show much color change as is common on standard plugs, and thus the ceramic color cannot be counted on to reveal mixture condition (i.e. lean or rich) accurately. NOTE: it is recommend that when you use these resistive plugs (in place of the stock non-resistive plugs) that you also reduce the resistance value of the spark plug CAP by 5K ohms in order to keep your total secondary path resistance at the original value. Each:
$ 14.95

HCP1291SET4 High-performance replacement NGK IRIDIUM SPARK PLUGS, set of 4.
$ 54.95



FZ700, FZX700, FZ750, FZR750, FZR1000, FJ1100, and FJ1200 engines:

HCP27698 Original DP9EA-0 NGK SPARK PLUG, stock non-resistive plug is correct for all of the following models: 1987 FZ700, 1986-87 FZX700 Fazer, 1985-86 and 1988 FZ750, 1987-88 FZR750R, 1987-90 and 1994-95 FZR1000, 1984-85 FJ1100, 1986-87 and 1989-93 FJ1200, 1986 SRX600, and 1984-89 XT600 models. Each:
$ 4.95

HCP27698SET4 Original BP7ES NGK SPARK PLUGS, set of 4.
$ 18.95




Spark Plug Tools:

HCP8674 Aftermarket deep-reach thinwall SPARK PLUG SOCKET, copy of the original tool used on XJ550 and 1984-85 FJ600 models. Includes the short "breaker bar".
$ 9.95

HCP9721 Aftermarket deep-reach thinwall SPARK PLUG SOCKET, copy of the original tool used on all XJ650, XJ700 air-cooled, all XJ750 air-cooled, XJ900RK, RL, N, F, and FN models, and all XJ1100 models. Includes the short "breaker bar".
$ 9.95

The following aftermarket PLUG SOCKETS are special deep-reach, thin wall design tools that are specially designed to allow use on XJ700-X and XJ750-X models, where the spark plug lives deep inside a recessed well on the cam cover. Typical plug socket tools are far too big in their outside diameter to fit into this well. Although not necessary, these sockets will also work fine on all XJ550, 1984-85 FJ600, 1992-98 XJ600 Seca II, and XJ900 S/SH model spark plugs also.

HCP9691 Aftermarket deep-reach thinwall SPARK PLUG SOCKET, copy of the original tool used on all XJ700-X water-cooled and XJ750-X water-cooled models models. Has a 17mm hex at the top end of a tool to accept a socket or wrench.
$ 11.95


HCP8552 Aftermarket deep-reach thinwall SPARK PLUG SOCKET, 3/8" square drive, needs to be used with a 3" extension to clear the valve cover on all "X" models.
$ 16.95

HCP9123 Aftermarket 3" socket EXTENSION BAR, chrome plated, 3/8" drive, for use with the HCP8552 socket above. Each:
$ 6.95


HCP8430 Aftermarket deep-reach thinwall SPARK PLUG SOCKET, 3/8" square drive, 13/16" hex wrench drive, or can be used with a straight round breaker bar, requires the use of a 1"-to-1.75" extension to clear the valve cover on all "X" models.
$ 21.95

HCP9124 Aftermarket 1-3/4" socket EXTENSION BAR, chrome plated, 3/8" drive, for use with the HCP8430 socket above. Each:
$ 5.95




HCP28131 Aftermarket THREAD CHASER AND CLEAN-UP TAP, made from a high-speed uncoated steel. For the following holes:

- 12mm spark plug holes on all XJ550, 1984-85 FJ600, 1986-88 FZ600, and 1986-90 YX600, XJ700-X, XJ750-X, 1987 FZ700, 1986-87 FZX700 Fazer, 1985-86 and 1988 FZ750, 1987 FZR750R, and 1987-88 FZR1000 engines. This deep-reach tap has a socket-drive head for constricted-space clearance, and will allow access to the plug hole even in the recessed XJ700-X / XJ750-X heads.
$ 23.95



HCP6378 Aftermarket THREAD CHASER AND CLEAN-UP TAP, made from a high-speed uncoated steel. For the following holes:

- 14mm spark plug holes on all XJ650, XJ700 air-cooled heads, all XJ750 air-cooled heads, XJ900, XJ1100, and all XS1100 engines. For use by hand or with a 13/16" socket. Each:
$ 13.95



HCP28170 Aftermarket thread tap or EZ-out extractor TAP HANDLE, featuring offset tap handles and fully adjustable head for all m3-m12 size taps and size 0 to ½” extractors. This is the proper way to hold a tap or extractor to insure that the force is directed straight down and doesn’t “wobble” as you are cutting, reaming, or extracting. Much better than using pliers or vise-grips to hold the tool……..
$ 17.95



NOTE: always use a proper thread-cutting oil or lubricant before using thread taps! Thin motor oils work fine when merely doing a "clean-up" thread chase; a real cutting fluid should be obtained if a threaded bore needs to be truly cut:

HCP2402 Aftermarket machinist-grade professional THREAD CUTTING FLUID, for use when cutting into aluminum or other soft metal. 4-ounce non-aerosol can.
$ 8.95

HCP2403 Aftermarket machinist-grade professional THREAD CUTTING FLUID, for use when cutting into steel or other ferrous metals. 4-ounce non-aerosol can.
$ 8.95




spt22) Spark plug drain well BRUSH and BLOCK-OFF PLUGS allow you to clean out the water-drain wells in the cylinder heads on all XJ700-X and XJ750-X (water-cooled) engines. These drain passages are only accessible by removing the cylinder head decorative, ribbed side covers (which will expose the small, center well drain-hole on the side of the head). This passage hole is used to drain water and associated grit and gunk from the spark plug wells on each side of the head (i.e. the left side hole drains plugs #1 and #2; the right side hole drains wells on the #3 and #4 plugs). Clogged drain ports allow water and other junk to build up in the plug wells, with predictable results. Our extra-long WIRE-BRISTLE BRUSH is the correct size and depth to purge these passages, while the BLOCK-OFF PLUGS replace the spark plugs while the cleaning procedure is being performed (the spark plugs must be removed to allow the brush clearance to pass all the way thru the passage).

The procedure to clean these wells ---- which, by the way, is not mentioned at all in the service manual ---- is as follows:

1) remove the decorative head side cover.
2) remove the spark plug cap/boot…….leave the spark plugs in for now.
3) using compressed air, blow out any debris in the wells.
4) remove the two spark plugs on that “side” of the head you are working on.
5) install the low-profile block-off plugs into the two spark plug holes.
6) use the wire-bristle brush to clean out the drain passage completely. Any debris will be “pushed” into the plug wells (that’s why you need to install the block-off plugs!).
7) using compressed air, blow out any debris in the wells.
8) remove the low-profile block-off plugs, and re-install the spark plugs, plug cap/boot, and decorative side cover.
9) repeat steps 1-8 for the other side.
10) this procedure should be done once every few years or so.


HCP21394 Aftermarket STAINLESS STEEL WIRE-BRISTLE CLEANING BRUSH, perfect size for cleaning out the spark plug well drain passage in the cylinder head of all the built-up gunk and debris. For use on all XJ700-X and XJ750-X engines..
$ 8.95

HCP21367SET2 Aftermarket spark plug hole BLOCK-OFF PLUGS, these low-profile plugs are the correct size to replace the spark plugs while cleaning out the spark plug well drain passage in the cylinder head. For use on all XJ700-X and XJ750-X engines.. Set of 2 plugs:
$ 11.95

HCP21998 Aftermarket spark plug well drain passages CLEAN-OUT KIT, contains the HCP21394 brush and two of the HCP21367 plugs, everything you’ll need to perform the cleaning procedure.
$ 15.95

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