some of the things that keep people from using motors like these is they need lots of things before they are minibike friendly like a mount that will adapt to the standard 4cycle mount plate - a throttle hookup - the crank set up to put the clutch sprocket in the correct relation to the rear sprocket - a clutch - a pipe that looks & sounds good some type of air cleaner and some type of detail job that makes the engine look better ... using one of these engines is a project all in its self