View machine data for past races Yamaha has competed in.
Balancer-fitted single crankshaft, 90-degree V-twin
This model featured further development of the single crankshaft, 90-degree V-twin engine that had been under development from 1987. The frequent crank assembly problems that plagued the 1988 0W90 and 1989 model 0WA7 were solved by a full-scale re-engineering of the crank. Engine vibration was also reduced with the adoption of a coupled-force balancer. Furthermore, rigid engine mounts were used to make the engine a stressed member of the frame, which helped boost handling performance. The 1990 model 0WB9 powered J. Kocinsky to the GP250 World title and its single-crankshaft V-twin engine technology was fed back into the 1991 model TZ250 and the production sport model TZR250.
- Capacity - 249cc
- Max Power - 80PS
1st: 3 Luca Cadalora Team Marlboro Yamaha Agostini Japan, Austria, UK 1st: 7 John Kocinski Team Marlboro Yamaha Roberts USA, Spain, Italy(Nations), The Netherlands, Belgium, Hungary, Australia