I've made several powered bikes over the years. Electric, 2 stroke, 4 stroke, belt, chain, friction drive, but this was my favorite. It has a larger scooter wheel now and a jack shaft. I left the governor in place which works like a cruise control. Set the throttle at 25 and it'll stay there uphill and down. The engine is too big to be legal where I live so it now functions as a battery charger for my solar powered house.