Description
If you’re running a Honda 400 and pushing for every last horsepower while maintaining reliability, worn pistons are leaving power on the table. WSM’s +1mm piston kit delivers the thermal management and structural integrity you need for sustained high-RPM performance without sacrificing longevity. Built to OEM standards with precision engineering that actually exceeds stock specifications, this is the foundation upgrade serious builders choose.
Technical Specifications:
- Fits Honda 400 engines
- +1mm oversized bore
- MOS2-coated skirts
- Heat-dissipating design
- Hardened ring grooves
- Improved E-clip design
- Includes piston, rings, pin, clips
- Bolt-on installation
- Order one per cylinder
- Additional rings available separately
- Meets/exceeds OEM quality
- MPN: 5022807K
