I'm hoping one or some of you can help me. I have a 1981 GS650GLX which hasn't been running quite right for the past year, and seems to be getting a little worse. It's a rough runner, especially during the warmup period. She likes to smoke a lot and often smells of raw fuel, and loves to backfire during downshifts. The kicker is, when I put a timing light on EACH of the spark plug wires, it showed an erratic misfire. Steady rapid blinks, then a period of misses; blink-blink-blink-miss-blink, etc.
After reading posts on here, I suspected a faulty igniter. However, I have gone through two of those with no change in characteristics (one was off of an '81 GS1000G, the other off an '82 GS650L). Also, I replaced the regulator/rectifier (also from an '82 GS650L), but put the original back on as it made no difference.
I checked the ignition coils per the tests in the manual and they passed. I understand this doesn't mean they're perfect, but that, combined with the fact that both would have to be faulty to cause the misfire to all 4 cylinders, tends to make me believe they're not at fault.
The other thing in question (in my mind) would be the signal generator, which I also tested according to the manual and was within specs. I have NOT replaced this part.
I hope I explained things okay here. It's probably good to note that the parts I used for replacements were eBay purchases. Any help would be appreciated. I miss the bike it used to be!!
Regards,
Aaron
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