(1972 / Racing Machine)
This was a GP125 factory machine that took the engine of the AX125 (AS3) production sport bike as its base. When Yamaha ceased official factory participation in GP racing in 1969, it developed a 125cc road racer that met the racing regulations put in place from 1970 for 2-cylinder machines with six gears or less, and supplied it to Yamaha importer-run teams and the like. The YZ623C had a new short-stroke, liquid-cooled engine with a dry clutch, and Kent Andersson and Chas Mortimer rode it to finish 2nd and 3rd in the ranking in 1972.
- Engine type: Liquid-cooled, 2-stroke, in-line 2-cylinder, 124cm³
- Piston intake valve
- Transmission: 6-speed
- Maximum power output: Over 23.5kW (32PS) / 14,200r/min
*All figures, etc. in a model's description or specifications are from when the model was originally released.
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