Wiseco PK1243 Pro-Lite Top End Piston Kit Standard Bore - 2-Stroke 66.4mm

The Wiseco PK1243 Pro-Lite Top End Kit is a complete forged piston kit engineered for 1986–1989 Honda CR250R two-stroke motocross engines. Built at a standard bore of 66.40mm, this kit delivers everything needed for a full top-end rebuild in a single package—no sourcing components separately.

What's Included:

• Pro-Lite forged piston — dedicated forging utilizing aerospace-grade aluminum alloy for a superior strength-to-weight ratio
• High-performance piston ring set — engineered for extended service life and sustained power output; Wiseco rings are designed exclusively for use with Wiseco pistons
• Alloy wrist pin — precision machined for consistent fit, reduced friction, and long-term durability
• Circlips (wire locks) — securing the wrist pin for reliable retention
• Top-end needle bearing — premium quality for smooth connecting rod operation
• Complete top-end gasket kit — premium materials exceeding OEM sealing standards for a leak-free rebuild

Key Features:

• Forged from aerospace-grade alloy for maximum strength with minimal weight
• CNC machined to tight tolerances for optimal cam shape and piston profile
• Race-proven design trusted by professional race teams across Supercross, Motocross, and GNCC competition
• Standard bore sizing (66.40mm) for stock cylinder applications
• 2-stroke specific Pro-Lite design optimized for peak horsepower and service life

The Wiseco PK1243 is the trusted choice for rebuilding the top end of a 1986–1989 Honda CR250R, providing OEM-surpassing quality in one complete kit. Whether restoring a vintage CR250 or maintaining a race bike, this kit offers the components and confidence needed to get back on the track.