I recently fitted a new exhaust and my carb is pretty off, so it doesn't idle unless on choke. It used to ride nice, but ever since I parked it for about two days it just revs but doesn't want to move. I took the transmission apart and my rollers wore down to 7-8 grams, could it be the problem? Also it revs weird, not you ussual but very high pitched rev. i suspect it could be something electric, but I'm not sure.
