Wiseco PK1477 Top End Piston Kit 89.5mm Bore for 1985-1988 Honda CR500

The Wiseco PK1477 is a complete ProLite top end piston kit designed for the 1985–1988 Honda CR500. Featuring an 89.5mm (871M) bore diameter, this kit provides everything needed for a full top end overhaul or overbore rebuild, delivering the precision and durability Wiseco is renowned for in two-stroke motocross applications.

Wiseco's ProLite forged pistons are manufactured using aerospace-grade aluminum forgings, offering a superior strength-to-weight ratio compared to cast pistons. The result is improved throttle response, enhanced heat dissipation, and extended service life under the demanding conditions of high-performance two-stroke engines.

Kit Includes:

• Forged ProLite piston (89.5mm / 871M bore)
• Piston rings
• Wrist pin (piston pin)
• Circlips (wrist pin retaining clips)
• Top end gasket set

Key Features:

• Forged aluminum construction for superior strength and reduced weight
• ProLite design engineered specifically for high-revving two-stroke motocross engines
• Complete kit — no need to source individual components separately
• OEM-quality tolerances for reliable fitment and long service life
• Designed for overbore or standard rebuild applications

The Wiseco PK1477 is the trusted choice for riders and mechanics rebuilding the legendary Honda CR500, ensuring your engine returns to peak performance with a single, convenient kit. Compatible with 1985, 1986, 1987, and 1988 model years.