(1984 / Production Model)
This model was developed as a replica of the YZR500 factory works machine that fan favorite "King" Kenny Roberts rode in the 1983 World Championship. It was the world's first production model to mount a 2-stroke V4 engine and it adopted different induction systems for the forward and rear banks of cylinders: crankcase reed valves in front and piston reed valves in the rear. Among the other innovative technologies employed throughout showcasing Yamaha's spirit of challenge was a horizontally positioned rear suspension mounted under the engine.
- Overall length × width × height: 2,085mm × 685mm × 1,145mm
- Weight: 173kg
- Engine type: Liquid-cooled, 2-stroke, V4, 499cm³
- Maximum power output: 47.1kW (64.0PS) / 8,500r/min
- Maximum torque: 55.9N･m (5.7kgf･m) / 7,500r/min
- Price: ¥825,000
*All figures, etc. in a model's description or specifications are from when the model was originally released.