Description
If you’re pushing your Yamaha WR500Z or YZ490 to its limits, stock pistons won’t cut it. The Wiseco +1.50mm oversize piston delivers the durability and power you need for serious trail and racing applications, with forged construction that handles sustained high RPMs and aggressive tuning. This complete kit gives you everything required for a professional-level top-end refresh.
- 88.5mm oversize bore
- Forged high-silicon aluminum
- E-coated wear protection
- Includes rings, wrist pin, circlips
- Optimized compression ratio
- Enhanced horsepower and torque
- Fits 1992-1993 models
- Expert-grade racing design
- Improved service intervals
- Micro-welding resistant coating
