GL1800 ingnition coils compatible for all years? - GL1800Riders
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post #1 of 11 (permalink) Old 03-14-2017, 01:16 PM Thread Starter
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GL1800 ingnition coils compatible for all years?

I have a 2002 GL1800 and am wondering if all years ignition coils are all compatible? I know part numbers changed in 2006 30520-P7A-007 to 30510-MCA-S42), but from what I've seen on other parts from other years that doesn't mean they are incompatible.

Thank you

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post #2 of 11 (permalink) Old 03-14-2017, 01:36 PM
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No ! 2001 thru 5 are different on my 08 tried to use the 05 year and have different plug = wiring . Try n look up pic n see difference
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post #3 of 11 (permalink) Old 03-14-2017, 01:37 PM
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You need all 3 or just one

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post #4 of 11 (permalink) Old 03-14-2017, 05:00 PM Thread Starter
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Coils

Uncle John, thank you for the information. I'm chasing a slight miss especially when cold. New plugs wires and spark plugs last year. I check the internal resistance on all 3 coils last year when I replaced them; all were nearly the same, though I don't recall the figure. I'm just gathering information right now.

Thanks again

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post #5 of 11 (permalink) Old 03-15-2017, 08:36 AM
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You probably know this, but for benefit of all; since you changed coils last year and are now trouble shooting a miss; consider the part that controls spark timing, the exciter or whatever term my foggy mind will not retrieve at the moment; maybe its called the "illudium Q-36 explosive space modulator" . Did you change the coils before due to same/similar miss?


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post #6 of 11 (permalink) Old 03-15-2017, 12:06 PM Thread Starter
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coils

Well, doggoneit, I sure wrote a less than clear message. I replaced the plugs and wires last year, not the coils. And yes, I was chasing the slight miss and since the wires were original (210, 000 ish miles), I went that route. I used a pretty primative spak tester that throws the spark across an adjustible gap and concluded cylinders 3 and 5 were weaker than the others.

I now own a good non contact thermometer and will measure the temp on the exhaust headers to see if I can pick out a weak cylinder. It's nothing that keeps me from riding. I like tinkering.

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post #7 of 11 (permalink) Old 03-16-2017, 06:59 AM
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A good read on the topic here:

New coils and plug wires make a difference



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post #8 of 11 (permalink) Old 03-22-2017, 06:22 PM Thread Starter
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I measured the temperature of the exhaust headers 30 seconds after starting, then at 2 minutes and again at 4 minutes. It wasn't missing noticeably at the time. Cylinders 1 & 2 ran 50-70 deg. F cooler throughout the test. A new solid gold with platinum contacts coil is on order. At least that's what I expect for the price.

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post #9 of 11 (permalink) Old 03-23-2017, 02:05 AM
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Let me / us know when you put on if any notice on temp / running etc.

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post #10 of 11 (permalink) Old 04-01-2017, 09:06 AM Thread Starter
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Well, I installed the new coil 2 days ago. BTW for those who have to do it, it's a pretty easy job, at least in a non-ABS 2002. I performed the same test and . . . No change. Cylinders 1 and 2 were still about 50 degrees cooler. Then I let her idle for about 10 minutes and cylinder #1 came up to temp with the others. Cylinder #2 never did. So I went for a ride and she runs as well as ever. I noticed something I hadn't felt in a while: while at a stop light, in gear with the clutch in, I couldn't tell the engine was running without looking at the tach. It was that smooth. So, did I condem a good coil? If I notice an increase in gas mileage, I'll say no. A trip to the Springfield Mile over Memorial Day will tell the tale.

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