Wiseco Piston Kit Honda XR400R 1996-2004 85.50mm 10:1 Compression 4606M08550

If you're running a Honda XR400R and want measurable gains in power delivery and reliability, a fresh piston kit is one of the most direct upgrades you can make. The Wiseco 4606M08550 delivers the compression ratio and durability you need to push your engine harder without compromise. This is precision engineering that pays dividends on the trail or track.

Wiseco pistons are engineered to tighter tolerances than OEM units, which means better ring seal, improved combustion efficiency, and less blowby—all translating to more usable power. The 10:1 compression ratio is optimized for the XR400R platform, giving you a meaningful bump in performance without requiring fuel or ignition system modifications. Built from high-strength aluminum, this kit handles sustained load and thermal cycling that would degrade lesser components.

Installation is straightforward with standard hand tools if you have basic engine work experience, though professional assembly is always recommended for optimal ring gap setting and piston-to-wall clearance. Keep in mind this kit does not include a gasket set—budget for a complete gasket kit separately to ensure a leak-free assembly.

• Bore: 85.50mm
• Compression: 10:1
• Material: High-strength aluminum
• Application: Honda XR400R 1996-2004
• MPN: 4606M08550
• Fitment: Engine-specific
• Installation: Bolt-on assembly
• Gasket set: Not included