i know we dont talk about this stuff. well its for a freind. Hes got a 50cc pocket bike he wants me to soup up. Are the cvt things any good for them or should i just try and fit a bigger engine? He says he wants it crazy fast but i think hed be content with it pulling him around the yard and up small hills lol i dont wanna tell him to spend 50$ on one if its rubbish. plus iv got to install it so im wondering how much modification ill have to do to fit it. I dont have the bike in my posession yet