(1968 / Racing Machine)
This GP125 factory machine mounted a liquid-cooled 60° V4 engine. It was a further development of the 1967 RA31 model, which was a scaled-down version of the 250cc RD05A. While it inherited traditional Yamaha road racer features like rotary disc valves, a forced lubrication system with an oil pump and a featherbed type double cradle frame, it underwent a full redesign in a pursuit of greater machine maturity and reduced weight. Ridden by Phil Read, it won both the Rider and Constructor titles.
- Engine type: Liquid-cooled, 2-stroke, V4, 124cm³
- Rotary disc intake valve
- Transmission: 9-speed
- Maximum power output: Over 32.4kW (44PS) / 16,800r/min
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