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[[Image:Blumfield V-twin motorcycle engine.jpg|thumb|200px|right|An early Vee engine - this is a two-cylinder V-twin used in an early British motorcycle]] ...pes of engine: a — straight engine, b — Vee engine, c — VR6 engine]]

...and MotoGP (up to 990 cc). In 2007, the MotoGP class will have its maximum engine displacement capacity reduced to 800 cc, ostensibly for safety reasons. ...n several races at each event for various classes of motorcycles, based on engine size, and one class for [[sidecar]]s. Classes for 50cc, 125cc, 250cc, 350c

...n several races at each event for various classes of motorcycles, based on engine size, and one class for [[sidecar]]s. Classes for [[50 cc]], 80 cc, 12 ...lusively of two-stroke machines. In 2007, the MotoGP class had its maximum engine displacement capacity reduced to 800 cc for a minimum of 5 years.

! Engine ...the period, weighing just over 1,500 lb (680 kg) despite using a cast iron engine block.