i don't belive the claculator for speed is right cuz i ran my ratio thru it not to long ago and it daid my max speed was like 30 mph, i have a 60 t sprocket and a 12 t clutch, im running a jack shaft also with a 12 t on the motor and the 11 on the shAFT therfore making my rpms go up from 3900 to...