This model shows the internal structure and operating principles of a water cooled four-stroke engine. The valves are clearly evident, cams being driven by a gear train from the rear of the main crank. This is the chain driven overhead camshaft type and all functional components (camshaft, rock-arms, tappets, etc.) are clearly demonstrated. The functioning of the fuel injection system is also represented. Cross sections of the carburetor and fuel supply are shown.
Hand powered motion supplied through a crank demonstrates the moving parts of the engine. Crank shaft, piston, valves and cams cycle through all stages of the four-stroke process as the handcrank is rotated. A simulated spark plug uses a small lamp to indicate the firing point. Solidly constructed out of aluminum and plastic. This large model measures approx. 300 x 225 x 125 mm and is mounted on a base approx. 200 x 200 x 60 mm. A placard on the base labels all key components. Lamp requires a 6-12 V power source (not included).