Description
If you’re rebuilding a Honda 400 engine, piston quality directly impacts compression, heat dissipation, and overall reliability under load. WSM’s piston kit delivers OEM-equivalent construction with a proprietary MOS2 coating that reduces friction and extends component life—critical when you’re pushing power limits. This is a bolt-in solution that handles both stock and modified applications without compromise.
- MOS2-coated skirts reduce friction
- Draws heat through piston walls
- Hardened ring groove tops
- Improved E-clip design
- Includes piston, rings, pin, clips
- Meets/exceeds OEM specifications
- One kit per cylinder required
- Additional rings sold separately
- Direct bolt-in fitment
- MPN: 50228K





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