(1991 / Racing Machine)
This factory machine took the YZ250 production motocrosser as its base and modified it for competition. It featured a new lightweight, highly rigid swingarm, an aluminum sub-frame and an exhaust pipe with a new shape. In the 250cc class of the World Motocross Championship, Pekka Vehkonen rode this machine to 6th-place in the season ranking.
- Engine type: Liquid-cooled, 2-stroke, single-cylinder, 249cm³
- Piston reed intake valve
- Transmission: 5-speed
- Maximum power output: Over 36.8kW (50PS)
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