Hey guys, here is my first motorised bike build, made from plywood, threaded rod, nuts and washers, and a 40cc chainsaw engine. Pretty good, had 60kmh/37mph top speed with it. The whole part on which the chainsaw is mounted is able to move up and down, there is a pedal that pushes it up (like a clutch) and large rubber bands pulling down. The engine shaft has a 30mm diameter friction drive. Kinda loud, good gas mileage, around 2L/100km (#metric #France #Europe)