| Re: high and popping idle hello, without knowing which bike i can give generalities. poping below advance curve usually means a rich condition the engine fighting its self to clear out as it does when the advance curve is reached with rpm.rich on bottom lean on top,epa specs again. or it can be so lean and harsh and usually hot that any spare fuel pops in intake manifold. check plug color the eyeball of the engine, at idle then at speed. at speed to check you will need to run the bike till you know your on the main jet, 60 to 80 mph. now pull in the clutch and kill motor with kill switch, coast to side of road and pull spark plug to determine fuel mixture. out of sync carbs uaually pops coming off idle. tim |