Flying Horse 66cc/80cc Motorized Bicycle Engine Crank Case Body &ndash; Gas Bike Lower End Crank Case Replacement The 66cc/80cc Bottom Crank Case Body replaces the crankcase for your Flying Horse, Grubee GT5, or RAW bicycle engine kit Installation includes removing various parts from the motor, which will take advanced experience to remove Note: this is a bare crank case body. There are no seals, gaskets, or parts included with this motor