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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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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...
 

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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.
 

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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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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
NO. that is wrong. Right coil fire the front cylinders, 1&2, left coil fires the rear cylinder,3&4. Like in Bellboy's image.
 
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