Flying Horse 2-Stroke Motorized Bicycle Heavy Duty Universal Mounting Bracket &ndash; Gas Bike HD U Mount Upgrade The Heavy Duty Universal Mounting Bracket will secure your 48cc or 66/80cc 2-stroke bicycle engine kit to your bicycle frame without the need for drilling in to your frame The upgraded Heavy Duty mount has a thicker mounting plate and an additional u-bolt for better hold on your frame Installation is simple: remove your front motor mount, install the plate in its place and set the plate on to the frame. Put the bolts underneath the frame up through the plate so the u-bolts wrap around the frame, then clamp fasten the nuts for the bolts and you're ready to ride Universal mount fits frame tubes around 1-3/4" in diameter