Rat Fink very fast lawn mower engine 400cc Yamaha motor that will be mounted on to my craftsman

Rat Fink very fast lawn mower engine 400cc Yamaha motor that will be mounted on to my craftsman Video Clips. Duration : 5.35 Mins.

What do you think? It is a 1979 engine with kick start and I think electric start? Any more information on what I should do and these engines please feel fre...