Off idle miss worsened

[dweller]

I recently used my carbtune to sync the carbs on my 82 GS1100E. I thought it might help with an off idle stumble/miss that was only present at the smallest throttle openings. Adjusted fuel screws while I was at it and noticed that the rpms did not respond to adjustment of carb three. Seeming to indicate that it was actually not firing. I realized after going through all this that the problem appeared to be ignition, but when I pulled the number three plug after a prolonged idle, it was dry and looked like the others. Now yesterday I rode the bike and it's missing badly at all rpms. I think missing on two cylinders. I've read some about coil and ignitor failures on these bikes. Not sure where to start. Suggestions? I was planning on aftermarket coils and wires. Seems like this would be a good starting point...

[tom203]

I'd do some simpleelectrical stuff first...check wiring from signal coils to ignitor,ignitor to ignition coils. Then remove spark plug caps and trim 1/4 inch off each plug wire and reinstall. Maybe get some new plug caps...$5 each..
If you've already done this, then carb cleaning would be next... You've probably already had this carb fun? Has the bike sat idle with untreated fuel?
I'm a fan of the italian tuneup....find some long downhills, accelerate, close throttle..rinse and repeat. Sometimes you get lucky!

[dweller]

Yes, will do on checking the connections. Was gone for a week but now ready to dive back in to the bike. Yes, I went through the carbs completely recently. full tear down and rebuild, including throttle shaft seals. It's definitely ignition. The bike has had only non-ethanol gas in it and I ride it several times a week, so I'm pretty sure its not a fuel issue.