i just blew the berring on my counter balance and am in the process of replacing all the berrings and the transmission cause the race from the berring did some damage so i figure while i have it apart i might as well do so modding im thinking a 240 kit and a stroker crank but i'll be doing mainly 50 plus mile trail rides and dont want to have to carry a gas can so if any one could tell me how bad this would make my mpg i'd really appriciate it also when i split my case a small single ball bering came out smaller than the ones from the counter balance any idea where it might go? thanx