that sucks. we were going to send a rear shock your way for a rebuild. maybe some mi bhq guys could get together and pay those losers a visit.
hope you get it straitened out soon
a bigger back sprocket will lower the gear ratio so the motor spins faster at slower speeds giving you the feel of more torque.
try a front sprocket with 2 teeth less then whats on it now, should help you out. front sprockets are cheaper.
there are a couple on cl in central mi. one is listed in waylan mi, nice looking shee and the guy tells it like it is not sugar coating the ad with bs.
it all depends on how much you want to slow it down, stock gears are 14/41 go to 14/44 and try it, if that isn't enough you can always go to a 13 on front. Jeff at FAST Racing sells good chain by the foot and has sprockets too. at great pricing.