02-06-18, 11:26 PM
There's a good chance it's a misfire caused by arcing through the spark plug caps. Very common problem, made worse when it's raining and you get water around the caps. Are you still using the original caps? If you run the bike in the dark you can sometimes see the arcing. NGKs are a good and cheap replacement for the originals. If you do a search on here you'll find the code for them. You can also trim the ends off the ht leads. They can corrode on the ends where they screw into the caps.