Transmission The transmission on this 1921 ABC motorcycle is located behind the engine and shifts by a long hand-operated lever on its right side. Main article: Motorcycle transmission Most modern motorcycles have a sequential manual transmission shifted by a foot lever. Some motorcycles, and many scooters, use a continuously variable transmission. Other types of automatic transmission and semi-automatic transmission are also in use. Engine power can be engaged or interrupted through the clutch, typically an arrangement .
Engine Almost all commercially available motorcycles are driven by conventional gasoline internal combustion engines, but some small scooter-type models use an electric motor, and a very small number of diesel models exist (e.g., the USMC M1030 M1 version of the Kawasaki KLR650 and the Dutch-produced Track T-800CDI). The displacement is defined as the total volume of air/fuel mixture an engine can draw in during one complete engine cycle. In a piston engine, this is the volume that is swept .
Frame The frame is typically made from welded aluminium or steel (or alloy) struts, with the rear suspension being an integral component in the design. Carbon fibre, titaniumand magnesium are used in a few very expensive custom frames. The frame includes the head tube that holds the front fork and allows it to pivot. Some motorcycles include the engine as a load-bearing stressed member; this has been used all through motorcycle history but is now becoming more common. Oil-in-Frame (OIF) chassis, where the .
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