I installed a pair of Accel coils, purchased the kit (plugs, wires, etc) for my 86 GSXR 1100. The exhaust pipe coming out of number 1 and number 4 are hot. The exhaust pipe on 2 and 3 are not. I have the NGK JR9B plugs gapped at .035.
First off are these the right plugs the dealer gave me. Is the gap O.K. or should I gap to something different.
Any other thought why the bike may not start, pertaining to the coil installation. Thanks everyone for your input.
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With used plug wires the length and shape of the wires should provide a clue. Engines using a coil pack usually use the wasted spark system where two cylinders at a time spark together so with a 4 cylinder engine with the usual 1,3,4,2, firing order, numbers 1 and 3 and 2 and 4 would be paired to spark together. When one cylinder of the pair is starting on the power stroke the other is on the exhaust stroke.
An ohm meter can quickly identify the pairs of coils in the coil pack...
In the absence of accurate information then fitting the leads almost at random plus a little common sense provides a limited number of possibilities. If one way doesn't work then try a different combination - attempting to start with the leads on wrong generally causes no damage...
TRY swapping back to your factory coils. I believe you are gonna find these coils are not compatable with the gm system. I assume truck is running fine? also the plugs may not work well with truck but this would show a po300. computer is designed to be able to tell the resistance in the coils and the amount of enegy used. when you swap with different components it messes with the values it expects to see. helped a corvette owner with similiar issues here:
One 12 volt power supply, cable length 1.8m - 6?
Optional when ordering, 5m - 16½' power supply extension lead
Antenna cable with red plug
Antenna cable with black plug
Five plastic cable ties (1 spare)
One attachable black antenna plug
One attachable red antenna plug
Please Note: Ensure antennae cables do not come into contact with each other
The gap between the coils must be in excess of 60mm - 2½" no upper limit
Coils require a minimum of 50mm - 2? each side of uninterrupted straight pipe
Direction of coils is essential - see over
Ideally a 125mm + (5?+) straight run of pipe is required for each antenna coil
Direction of Water Flow is immaterial
Connect red plugs to red sockets and black to black
Scale Manager is effective on all pipes (copper, plastic, lead, steel etc)
Performance is not impaired if the pipe is painted
The Control Unit can be fitted at any angle or plane
A 13-amp socket is required for the power supply
The ideal location to install Scale Manager is near the entry point of the rising main, before any junctions. The antennae coils operate independently and can be positioned on separate pipes should you not have an uninterrupted pipe run of 250mm - 10?. Should the inlet pipe T off within 125mm - 10? of the stopcock, position the coils as fig 1 overleaf. If the inlet pipe available is over 125mm - 5? but under 250mm - 10? position as fig 2 overleaf.
The antennae coils require a minimum gap between them of 50mm - 2?. It is also necessary that the coils are at least 40mm -1½" from elbows and junctions.
Remove the rider's seat, using an Allen socket to unscrew
the pair of bolts that secure the rear of the seat to the frame. Lift
the rear of the seat upward then pull the seat toward the rear of the
motorcycle to disengage it from the frame's catch tabs.
Remove the pair of bolts that secure the front of the gas
tank to the frame. Lift the fuel tank upward on the pivot at the base of
the tank. Support the fuel tank against the frame using the tank's
Remove the air box. Pull the three air hoses from the air
box. Loosen the clamps on the air box's rubber boots with a screwdriver,
and pull the air box out of the motorcycle.
Pull the four coil packs out of the motor's cylinders. Clear
any dirt and debris that has accumulated on top of the cylinders with
compressed air, directing the air into the spark plug holes that the
coil packs were installed in. Remove the spark plugs using a spark plug
socket attached to a socket extension.
Install new, properly gapped spark plugs into the motor with
a spark plug socket. Tighten the socket until it is seated firmly
against the motor. Reinstall the coil packs onto the spark plugs.
Reinstall the air box, tightening the clamps on the rubber
boots to secure the air box to the throttle bodies. Reconnect the trio
of air hoses to the air box.
Remove the tank support rod and lower the fuel tank onto the
frame. Insert and tighten the fuel tank bolts with an Allen socket.
Reinstall the seat, firmly tightening the mounting bolts with an Allen
That's because your new coil is probably for a "single fire" ignition system. Your original coil is designed for a "dual fire" ignition system. It depends on your ignition system. If your ignition system is a stock system, it's a "dual fire" ignition system. In other words, both spark plugs fire at the same time every time the piston comes to top dead center. This generates what is known as a "wasted spark" on the cylinder that is on it's exhaust stroke but Harley has used this system for many years and still does today. I'd suggest that you look up the part number of your Accel coil and see if it is designed for use with a single fire aftermarket ignition system. If your bike uses the original ignition system, see if you can return the coil in exchange for the proper coil. Be aware that some dealers and parts sellers will not exchange or refund on electrical parts.
Chances are you are still running the original point system. It sounds like one or both point sets have dirty contacts or are shorting out. Honda sold a tune up kit that came with plugs, condenser, and points mounted on a new plate. If that is no longer available you may still be able to order in the point plate assembly. If you enjoy touring or long distance riding and are sick of messing with the hole point set up , you can purchase a Dyna S electronic ignition system from Dynatek that is self contained under the point cover for around $170. I have two Gl1000's equipped with this system and have never regretted the switch. After 10 years with the Dynatek system I have never had a lick of trouble with them. For added performance you can add a set of Accel coils #140404 for CDI systems with wires. If your points are new but the coils are bad you need Accel coils for the point set up use #140403.
If the points are working correctly you are having a problem with the condenser ,coils,spark plugs,or spark plug caps. Honda condensers are notorious for being week. Spark plug caps have resisters that burn out or corrode. Coils can go bad but do not usually go out in pairs. Plug wires can short out the spark if the are old and cracked or wet. One coil does two plugs so on shorting wire on each coil will kill all the spark.You can see this if the bike is running at night where it is dark. Aftermarket Accel coils($150-$200) might be a good option along with an after market CDI ignition (may still be available through Parts Unlimited about $200). I suspect that your problem is still the points. Power is going to them but not leaving them. Even new points may have to be reinstalled several times before they decide not to short to ground.
Old coils have wires that arc and 5000 OHM caps with blown resisters that can cause your problem. You could try replacing the plug caps on the end of the wires (they unscrew) (NGK about $20) Accel makes some bolt in replacement coils for the gl 1000 and gl1100 ($150 to $200). The kit comes with yellow wires and spark plug caps. I substituted snap on Ford truck wires because they were black. With this kit you need screw on tops for spark plugs (Honda snaps there caps on to the threaded plug top with out the screw on aluminum dome). Start your bike when it is dark out side and spray water on the wires to look for shorting. Also, does it cut out in the rain? Your cheapest fix would be to try the new plug caps first, unless of course, the wires are shorting.
Does it run and ride fine with the balance pipe disconnected?
Have you checked your ignition coils. If you have a manual, check which coils fire which cylinders. Does this tie up with the two cylinders that are getting hotter, (are the other to staying cool/cold?) each coil provides the spark for two cylinders. You can swap the coils and see if the other two pipes go blue, that way you know a set of coils is bad. It sound like you have done everything on the fuel side, which leaves mechanical or electrical. Dont forget to check/clean/change the simple things such as the spark plugs and caps.