Flying Horse 66/80cc 2-Stroke Motorized Bicycle Engine Cylinder Body &ndash; Gas Bike Cylinder Body (30mm) The 66/80cc Cylinder Body will replace the cylinder body of most 2-stroke 66/80cc motorized bike engine kits, including Flying Horse, Mega Motors, Grubee, Stinger, RAW, and Power King motors Installation is simple: unbolt and remove your cylinder head cap and remove them. Once removed, gently lift the cylinder over the piston. Replace your bottom head gasket (if needed), lightly lubricate the cylinder with a touch of 2-stroke oil, and install the new cylinder over the piston. Reinstall the cylinder head back on to the cylinder and you're ready to ride Note: Gaskets are not included with the cylinder 30mm Intake Manifold Stud Spacing