After changing sprockets to 13/52 to get a nice low 1st gear for crawling around in the woods, I felt the power became too harsh and difficult to control. So I put on a flywheel weight, made a grey pvc insert for in the exit of the carb which reduced the opening to 33mm, and made a cover for the airbox. None of these things seemed to do much until I RETARDED THE TIMING!!! Just what the doctor ordered!!! It didn't even seem to reduce the power, but smoooooothed out the delivery. It also seems much easier to kick. It just made the bike more friendly. If I want to get crazy, I just open the air vents on the sides of the airbox and get a nice top end boost.