Flying Horse 66cc/80cc 2-Stroke Motorized Bicycle Complete Top End Gasket Set &ndash; Gas Bike Cylinder Gasket Set The 66/80cc Top End Gasket Set works great for 66/80cc bicycle engine kits brands: Grubee, Flying Horse, Mega Motors, Stingers, RAW motors, and more Set includes top and bottom head gaskets (6mm head stud ports), along with an intake gasket and an exhaust gasket (30mm spacing)