The power plant includes the engine and its fuel, the carburetor, ignition, lubrication, and cooling systems, and the starter motor.
Inlet of the fuel-air mixture into the cylinder and outlet of the burned gases are controlled by valves. The valves are actuated by the camshaft generally supported in the crankcase. Valves, camshaft and camshaft drive are forming the control mechanism of the engine.
The crankcase bottom is closed by the oil pan holding the oil required for lubrication. The oil pan is connected to the crankcase. The liquid fuel is mixed with air and vaporized in the carburetor. This fuel-air mixture enters cylinder and combustion chamber. Inside the combustion chamber, the fuel-air mixture is ignited and burned by a spark jumping at the electrodes of a spark plug.
The generator is driven by the engine. When the engine is running at sufficient speed, the generator supplies the ignition current and charges the storage battery.
The starting motor is a small electric motor. When it is actuated, a driving pinion is shifted and meshes with the toothed rim of the flywheel. Thus the crank-drive assembly begins cranking (working).
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