50cc 2 stroke moped, Bought needing work, Fitted new clutch, Clutch spring, Belt, Variator rollers and 70ccbig bore kit. Main jet incresed from 89 to 110 but still will not accelerate properly.and achieve more than 20mph I suspect it may need a sports exgaust or larger carb. Its MOT runs out in Jan 2017 and I have purchased an alternative moped for my daughter. I have lost interest in the bike. It will make an excelent sports moped for someone who wants to spend a little time on it.