Description
A piston kit is the heart of your engine’s combustion cycle—wear or damage here directly impacts power output, reliability, and longevity. WSM’s piston kits for the Yamaha 660 are engineered to meet or exceed OEM specifications with advanced materials and design refinements that reduce friction and heat while strengthening critical wear surfaces. Whether you’re rebuilding after high-mileage wear or upgrading for enhanced durability, this kit delivers the precision fit and performance characteristics your engine demands.
- Complete kit includes piston, rings, pin, clips
- MOS2-coated skirts reduce friction and heat
- MOS2 coating dissipates heat through piston walls
- Specially hardened ring groove tops
- Improved E-clip design for secure retention
- OEM-equivalent or better quality standards
- Order one kit per cylinder
- Additional rings sold separately
- Fits Yamaha 660 applications
- MPN: 50-544K
