I am buying a bike kit soon thats why I am posting so much. I have been looking and looking at 66cc motors. You guys always say look around then buy so I did that. you guys talk about super CDI coils and stuff I can't find them anywhere but no big deal thats later. I want to know simple like what is the best Chinese motor on the market today. Then where to get a expansion chamber for it? I see some but there used on 48cc and 66cc a expansion chamber will help but it needs to be tuned to one engine to be good so where could I find a good one?