A four stroke cycle engine is an internal combustion engine that utilizes four distinct piston strokes (intake, compression, power and exhaust) to complete. The piston makes two complete passes in the cylinder to complete one operating cycle. An operating cycle requires two revolutions (720 °) of the crankshaft. The four stroke cycle engine is the most common type of small engine. A four stroke cycle engine in one operating cycle consists of, including intake, compression, ignition, power, and exhaust strokes.