[Emil]

^^^^My thoughts were also in the chain adjustment/wear area too.

 

[Emil]

Normally if the bike stalls/misses in the rain, it would most likely be the wire coming from the coils getting wet. I had the same problem my 1985 and had to replace the coils along with the wires. No problems at all since. I had an 87 parts bike to rob from, so, no I haven't tried anything off the internet for it yet.

 

[Emil]

You can easily test the theory about the coils before you buy some, by starting the engine, while already warm, & spraying a mist of water on the coils. If the engine starts to misfire, you know.