1978 YZR500 (0W35K)
(1978 / Racing Machine)
This was the first GP500 factory machine to feature the Yamaha Power Valve System (YPVS). The variable exhaust valve controlled exhaust timing and eliminated torque valleys in the powerband, which translated into dramatic drops in lap times. Debuting late in the 1977 season, Johnny Cecotto rode this YZR500 to consecutive wins in Finland and Czechoslovakia. In 1978, Kenny Roberts rode it to four victories to win his first of three GP500 championship titles.
- Engine type: Liquid-cooled, 2-stroke, in-line 4-cylinder, 499cm³
- Piston intake valve
- Transmission: 6-speed
- Maximum power output: Over 77.2kW (105PS) / 10,500r/min
*All figures, etc. in a model's description or specifications are from when the model was originally released.
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