I'm going to try to jump right in because I have an extra engine and figured it would at least be worth the experience when the time come to move up. But for now, could this work? It's a 25 cc weed trimmer motor.
That will work great. Good engine, easy mounting. Put a peg on the flywheel and mount it by the metal that the plastic screws into and you've only gotta put it on ur bike.