Flying Horse 48cc/66cc/80cc 2-Stroke Motorized Bicycle Engine Motor Mount Bracket &ndash; Gas Bike Motor Installation Bracket The Motor Mount Bracket helps secure the motor mounts for any 48cc or 66/80cc motorized bike engine to your bike frame Installation is simple: mount your engine within your frame. Once fitted, place the motor mount bracket behind the frame and through the motor mount studs. Fasten your motor mount studs and you're ready to ride Note: These brackets will only fit 1-1/2" frames