Description
A quality piston kit is essential for any top-end rebuild on your TRX400EX—it directly impacts engine reliability, throttle response, and longevity under sustained load. Wiseco’s forged-aluminum construction handles the thermal stress of high-performance riding while maintaining tight tolerances that keep your engine efficient and responsive. This complete kit eliminates the guesswork of sourcing individual components, giving you everything needed for a professional-grade rebuild.
The high-silicone aluminum alloy resists thermal expansion better than cast alternatives, which means less piston rock and tighter ring sealing across the rpm range. Whether you’re pushing your quad on the track or rebuilding after years of hard use, this kit delivers the durability and precision you need to get back to riding with confidence.
- High-silicone forged aluminum
- Reduced thermal expansion
- Complete rebuild kit included
- Rings, wrist pins, circlips
- Top-end gasket set included
- Optimized for XR/TRX400 models
- Engineered for high heat/pressure
- Use only Wiseco rings
- Fitment: 1999-2008 TRX400EX
- MPN: PK1036
