Might try to build a 125cc Lifan bike
So I currently have a single speed 79cc predator bike that can do about 40 on level ground, but I would like a bigger, higher quality engine. I was thinking the 125cc lifan would be cool to build a bike out of because of the built in 4 speed transmission. Only thing is that the engine is about 17" long, so I'm not sure how to go about finding a frame that it would fit in... anyone have experience with this engine? Tips, tricks, frames that work, etc.