Wiseco PK1570 Pro-Lite Top End Piston Kit Bore - 2-Stroke 70mm

The Wiseco PK1570 Pro-Lite Top End Kit is a complete 2-stroke rebuild solution featuring a 70.00mm (677M) bore forged piston engineered specifically for the 1995–1998 Yamaha YZ250 and WR250. Wiseco's Pro-Lite line is the forged 2-stroke piston that set the standard for performance and reliability in powersports engine rebuilding.

Each Pro-Lite piston is engineered, forged, and machined in the USA at Wiseco's facility in Mentor, OH, utilizing aerospace-grade alloy for an optimized strength-to-weight ratio. The dedicated forging design and additional lightening operations deliver sharp throttle response and peak power output across all riding conditions—from the trail to the track.

Key Features:

• Forged Pro-Lite piston with dedicated 70.00mm bore forging for superior strength-to-weight optimization
• Computer-engineered piston skirt profile minimizes cylinder wall friction for extended engine life
• Anti-detonation grooves and precision ring land diameter eliminate ring blow-by and maximize performance
• Extra lightweight piston design delivers instant, responsive throttle feel
• CNC machined to exacting tolerances for optimal fit and reliable sealing
• Race-proven design trusted by top Supercross, Motocross, and GNCC race teams
• Engineered, forged, and machined in the USA in Mentor, OH

Kit Includes:

• 1 Forged Pro-Lite Piston (70.00mm / 677M bore)
• Piston Ring Set
• Wrist Pin
• Circlips
• Top End Wrist Pin Bearing
• Complete Top End Gasket Kit

The Wiseco PK1570 is a true one-stop top end rebuild kit, providing every component needed to restore your 2-stroke engine to peak performance. Whether overboring a worn cylinder or performing a routine top end refresh, this kit delivers OEM-exceeding quality in a single package.