Ok well I was riding today, not really getting on the gas much but alot of wheeleing action in all gears then after just crusing I get off the gas in 4th and it suddently starts poping and backfiring like crazy, I mean really loud and poppy sounding. my question is, is it time to reshim the valves? seems like to me that the intake doesnt have enough clearence. God I wish everyone had the same valve designe as KTM does. By the way, I need a quik answer because I would like it if I could it to the track on the weekend.