Wiseco PK1584 Top End Piston Kit 89.5mm for 1982-1984 Honda CR480/CR500

The Wiseco PK1584 is a complete top end piston kit designed for 1982–1983 and select 1984 Honda CR480 and CR500 motocross engines. Engineered to support oversize rebuilds, this kit is built around an 89.5mm (871M) forged piston — delivering the strength and precision fitment that serious two-stroke riders demand.

Wiseco forged pistons are manufactured from high-strength aluminum alloy using a forging process that produces a denser, stronger part than cast alternatives. This results in better heat dissipation, improved durability under high-compression, high-RPM conditions, and a longer service life — critical for competitive motocross and off-road applications.

Kit Includes:

• Forged piston – 89.5mm bore diameter (871M)
• Piston rings – correctly sized for the overbore
• Wrist pin – precision-ground for accurate fitment
• Circlips – retaining clips for wrist pin installation
• Top end gasket set – all necessary gaskets for a complete top end rebuild

Everything needed for an oversize top end rebuild is included in one convenient kit, eliminating the need to source individual components separately. Wiseco's motorsports heritage and OEM-level quality standards make the PK1584 a trusted choice for two-stroke engine rebuilds.