hmmm this is a toughie.....
There is a green wire that grounds to the frame right where your ignition coil is...i think thats what it is called, where trailprotrailpro spark plug wire comes from. Anyways, make sure that the area where the wire touches and the wire it self are clean.
Another possibility i can think of, is take off your CDI base generator cover. Take the spark advancer mechanism off and the cdi pulse generator off.
Wipe everything down with a dry towel or shop rag. Make sure no moisture is in there or the machine will run like a sack of crap.
g/l Sean
1984 Honda 200ES
1985 Honda 200M - Port and Polish
Weisco 10.25:1
197? Mini Chopper w/ briggs 6hp
1985 Chevy 3/4 350 s/b, w/ 4bbl holley