Thatsdax, do you sell your engines with needle bearings? I bought one about 2 years ago, would it have needle bearings. I also bought one about a month ago a 70 cc, the one I bought about a month ago is scarry fast. The one with out the ecorn nuts, or maybe my old one has too many miles on it and I forgot what a new one was like. 2 years with hard rideing. like every day full blast up hills and everything.