Hi all I am new to this forum and could do with some help!
I just got a go kart with a motorbike engine fitted and I was wondering how I would identify which type of bike it came from from its engine number.

I know its from a yamaha (judging from the engine it looks like from a road bike) its a 100 cc

any help would be appreciated
thanks in advance

Hayes manuals are very helpful if you give them a call, they have helped me out before when I needed to id a model.

thanks for your help! I never thought of that will ring them