I have a stock 91 EGC with the 1340 EVO. The other day out of the blue my bike started to kick,spit, and backfire. I didn't have time to check it out yet but I figured I'd ask you guys first for some ideas. It has 23,000 miles on it. I was able to nurse it home from around the corner, but it wasn't cooperating. It seem like a intermittent ignition problem. It would develop normal power and then act up. It was constantly going back and forth between normal power and misfiring. (quickly). When it lost power the tach would lose power so it seemed. (fall towards zero like it lost it's electrical sorce) . When I got it home I moved the plug wires to see if maybe it was grounding out and the #2 wire gave me a "little" ZAP. I tried moving the wires around to see any arching but I didn't see any in the dark. I had the plugs out the other day and they looked great. I rebuilt the carb last year. The wires were on nice and tight. I,m not sure if wires would cause that type of problem, but I don't know. I bought the bike 2 years ago and never tuned it. Never had to. 43mpg and clean plugs. I suspect coil, but i don't know. I hate spending good money after bad. any help would be greatly appreciated. I also always run Sea Foam. Ride Safe. Bus Driver.