Wiseco 85.50mm Piston Kit for Honda XR400R 1996-2004 PK1037

When your Honda XR400R's top end is worn, a quality piston kit is the foundation of a reliable rebuild. Wiseco's PK1037 gives you precision-engineered pistons that restore lost compression and power while including all the complementary components you need—rings, pins, circlips, and gaskets—so you're not hunting down parts separately. This is the kind of complete solution that keeps you riding hard without surprise failures down the road.

The 85.50mm bore sizing ensures a direct fit to your 1996-2004 XR400R, and Wiseco's proven ring technology pairs seamlessly with these pistons for a tight, efficient combustion chamber. Whether you're rebuilding after high-mileage wear or preparing for aggressive trail or enduro use, this kit delivers the durability and performance you need in a demanding four-stroke engine.

• Fits Honda XR400R 1996-2004
• 85.50mm bore diameter
• Includes pistons, rings, wrist pins
• Circlips and gasket kit included
• Wiseco-matched ring compatibility only
• Complete top-end rebuild solution
• Precision-engineered construction
• Cylinder sleeve sold separately
• Bolt-on installation (rings and pins)
• Professional fabrication recommended