Motorcycle engines

                            MOTORCYCLE ENGINES must be light weight and compact, and have a good power output. they have between one and six cylinders, can be cooled by air or water, and the capacity of the combustion chamber varies from 49 cc (cubic centimeter) to 1500 cc. two types of internal combustion engine are common; the four stroke, which is used in cars, the two stroke.

                          A basic two stroke engine has only three moving parts the crankshaft, the connecting rod, and the piston but the power output is high.the engine fires every two strokes (rather than every four), giving a ''power stroke'' every revolution. power is conveyed from the engine to the rear wheel by the transmission system. 

TRANSMISSION SYSTEM AND MULTI PLATE CLUTCH 

this usually consists of a clutch, a gearbox, and a final drive system. clutches are multi plate device, which run in oil. gearboxes have five or six speeds and are operated by foot pedal. shaft and belt drive systems are used in some cases, but chain drive to the rear wheel is most common.

MODERN ''O RING'' DRIVE CHAIN 

VELOCETTE OVERHEAD VALVE (OHV) ENGINE 

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