hey shaka what size gears did you have. i live in hawaii and we mod honda dio and sym dd50 and make them go 70-80mph.i current have a sym dd50 with 7.4 gear, 28mm oko carb, 72cc polini corsa race,upgraded trans and V8 pipe.ive been hitting about 65 mph so fars still breaking in.man if you want the best 72cc go with the polini corsa.call Quick Fix if you need and parts frank 8085930007.he has everything you need to make your jug motor scream