A motorcycle engine is an engine that powers a motorcycle. <br /> <br />Motorcycle engines may be two-stroke or four-stroke internal combustion engines, but other types have been used in small numbers. The engine typically drives the rear wheel. Most engines have a gearbox with two to six ratios, reverse gear is rare but does exist for sidecar use. Power is sent to the driven wheel by belt, chain or shaft. In Europe, before the 1969 Honda CB750, engine capacities typically ranged from about 50 cc to 750 cc; but since then machines with capacities up to 2,300 cubic centimetres (140 cu in) Triumph Rocket 3 have become common. In the USA, motorcycles with large capacities have been common for much longer.
