1986 gl1200A backfiring and stalling - Steve Saunders Goldwing Forums

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post #1 of 11 (permalink) Old 07-03-2019, 08:19 PM Thread Starter
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Location: Des Moines, Iowa
Year: 1984
Make: Honda
Model: GL1200A
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1986 gl1200A backfiring and stalling

So I recently bought this 86 1200a with 94k miles. After purchase I was driving home and after 40 miles or the bike started backfiring and stalling, pulled off the road and tried to restart and it would constantly backfire some more. I then waited 10 mins and tried to start again and it fired right up no problems like nothing happened. Started back down the road 5 miles or so and it started to do it again in which this time it wouldn’t start. Next day I got it home via trailer and it started up went 9 miles back fired stalled got it home and started to trouble shoot it. I drained fuel took air compressor and sprayed in petcock in hopes to clear blockage replaced fuel filter and pump. Took for ride and same thing again. Checked spark plugs 1-3 were dark and 2-4 were white pulled coil and checked right coil and failed replaced coil started it up and same thing happened again. So at this point I’m at a loss runs fine otherwise no flat spots only stutters when backfire starts and stalls. At this point I’m at a loss can someone point me in the right direction
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post #2 of 11 (permalink) Old 07-03-2019, 09:08 PM
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Location: Glendale, Arizona, USA
Model: 1987 GL1200 Interstate 290,000 miles
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I'd guess it is the pulse generators. Maybe the ECM.

When it dies, check for spark. To make sure you get to it in time, pull off the chrome plug covers before the ride and keep a spare plug in your pocket.

I can't remember which coil fires what plug but there's a pic somewhere that shows. I believe this is described wrong in the book, so...

Why ain't we ridin'?
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post #3 of 11 (permalink) Old 07-03-2019, 09:10 PM
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Location: Denver CO
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Wouldn't be surprised if you have a pulse generator going out, Sometimes they will be OK cold and then the windings open when hot.

1972 CL-350 (1980-1988) sold
1978 Suzuki GS-550 (1985-2005) sold
1977 GL1000 (2002-2006) sold
1980 GL1100 STD Vetter (2005-)
1993 GL1500 Aspencade (2017-)
1983 Trav-Lite Camper (2010-)
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post #4 of 11 (permalink) Old 07-03-2019, 10:47 PM Thread Starter
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That’s kinda what I was wondering but I wanted other feedback before I tear into it again
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post #5 of 11 (permalink) Old 07-03-2019, 10:48 PM Thread Starter
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Right coil fires 1-3 left is 2-4
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post #6 of 11 (permalink) Old 07-03-2019, 10:53 PM
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That's what the book says but I think it's wrong.

Why ain't we ridin'?
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post #7 of 11 (permalink) Old 07-04-2019, 06:45 AM
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Here is a diagram showing how the coils are wired.
Attached Images
File Type: jpg Coil diagram - 4 cylinder.jpg (23.7 KB, 10 views)

Larry

Only two things are infinite... the universe and human stupidity; and I am not sure about the former.
-- Albert Einstein

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post #8 of 11 (permalink) Old 07-04-2019, 09:50 AM Thread Starter
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Well I ordered a pg today, I’ll let you guys know what happens
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post #9 of 11 (permalink) Old 07-04-2019, 10:51 AM
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Quote:
Originally Posted by Bellboy40 View Post
Here is a diagram showing how the coils are wired.
Thanks Larry. I had that, somewhere, but couldn't find it yesterday to save my soul.

Why ain't we ridin'?
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post #10 of 11 (permalink) Old 07-06-2019, 08:23 AM
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Wiring order i agree with it being wrong i jave a 83 interstate was told i was not the way it says but i know it is one coil for 4 an2 and another one for 3 an1
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