my 2000 rev 3 was running very sick back fireing coughing and spluttering.changed the plug no good. cleaned the carb much better but now when using wide throttle openings it miss fires or 4 strokes. When stripping the carb checked the air jet ( looking from filter side this is the small hole at the bottom of the carb inlet) mine is stright thro. The Mikuni VM manual shows a jet, should there be a brass jet or something in there?

this may sound extreme, but my mate had the same problem with an 01 rev 3, which turned out to be the stator. new stator, no more problems.

I had the same problem with a rev3 2001. It wasnt the stator (200

Ive changed the stator and it now runs ok. the timeing marks now move smoothly when the revs increase.

thanks for the help.

glad i could help.