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Yamaha YZR500

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upload.wikimedia.org/wikipedia/commons/a/a6/1975_Y...
The Yamaha YZR500 was a 500 cc Grand Prix racing motorcycle made by Yamaha from 1973 through 2002. Wikipedia
Bore / stroke: 54 mm × 54 mm (2.1 in × 2.1 in); 56 mm × 50.6 mm (2.20 in × 1.99 in)
Power: OW23: 66.2 kW (88.8 hp) @ 10,500 rpm
Predecessor: Yamaha YZ634A