The clutch is one of the important parts of the engine. It is a mechanical component of any engine that allows the transfer of the rotational energy from the engine (drive shaft) to the transmission and restrict power to the transmission from the engine.The job of maintaining or controlling the transmission of power from the engine to the wheels is done by the clutch and uses a fairly simple physical phenomenon called friction to operate. Motorcycles generally use a 'wet clutch' in the engines and is operated with the help of a lever and cables. However, there are clutches which can be actuated using hydraulic cylinders and fluids. Ex: Wet Clutch. Dry Clutch. Slipper Clutch.