47cc racing moter ?

I think at least one person has fitted up a piped version of one of these to a bike... they are fairly powerful for this application though.

My bike runs a 32cc engine with a pipe and tops out at 35mph - easily cruises at 30mph - some have had bikes up to 55mph and one electric made a recorded 57mph

If your not familiar with MB's it might be worth going with something a little less powerful first and then upgrading as and when..

Jemma xx
look in introduce yourself bhaydosuperpocket ive built one the only thing is clutch slip ive moded a blata 39cc ajustable cluth and heaps better