Internal-combustion unit in which the four operating cycles - induction, compression, expansion and exhaust - occur during each crankshaft revolution.
A once-common type of engine now found almost exclusively in off-road motorcycles. A two-stroke motor fires once with every two strokes of the piston. 1) Once fired, the downward stroke of the piston delivers power and then draws in a mixture of fuel, air and oil which displaces the exhaust gases in the combustion chamber; 2) the upward stroke compresses the mixture for ignition.
an internal combustion engine which works on two-stroke cycle, ie power is developed for alternate strokes; for the same size and number of cylinders, a two-stroke engine develops almost twice as much power as a four-stroke engine compare four-stroke engine