What to do with racing cart motor

Friend of mine has taken a Comer W60 engine(assuming 60cc) from his sons go cart as they have to change to 4stroke for the off road racing he wants to do.. Really dont want to lose this little screaming beauty. Anyone interested or have any out of the box thinkers (build it into bicycle frame) of what to do with it. Want to buy a good helmet for the little peanut.

Will stick it up in for sale as well