Official Harley Davidson Twin Cam 88 engine 1; 2 scale model with electric drive motor, suitable for Ages 12 & Older. With more than 150 injection molded parts. Clear external parts allow a clear view of all key internal parts The mechanical operation of the real engine is demonstrated with working crankshaft, pistons, valves, rods, rocker arms, and camshafts An electric drive motor is concealed under the display base, and has a sound card recording of the real H-D Twin Cam 88 Complementing chrome plated parts also included. Metal coil springs and vinyl belts. Detailed assembly guide with illustrations. New in the original box