Wiseco PK1701 Pro-Lite Top End Piston Kit - 54.5mm for 1994-1996 YZ125

The Wiseco PK1701 Pro-Lite Top End Piston Kit is a complete rebuild solution for the 1994–1996 Yamaha YZ125, featuring an oversize 54.5mm bore diameter (647M). Designed for motocross and off-road riders who demand reliability and performance, this kit includes everything needed for a proper top end overhaul or overbore rebuild.

Wiseco's Pro-Lite pistons are forged from high-strength aluminum alloy, making them significantly stronger and lighter than cast alternatives. The forging process creates a denser grain structure that withstands the high heat and mechanical stress of two-stroke competition engines, delivering longer service life and consistent power output.

Kit Includes:

• Forged Pro-Lite piston — 54.5mm diameter (0.5mm oversize)
• Piston rings — pre-gapped and ready to install
• Wrist pin — precision-ground for smooth operation
• Circlips — retaining clips for wrist pin installation
• Top end gasket set — complete sealing gaskets for the top end assembly

Key Features:

• Forged aluminum construction for superior strength-to-weight ratio
• Pro-Lite design reduces reciprocating mass for improved throttle response
• 54.5mm bore fits standard overbore cylinder specifications
• All components included for a complete top end rebuild
• Manufactured to OEM tolerances for proper fit and reliable sealing

The Wiseco PK1701 is the trusted choice for rebuilding or overboring the cylinder on 1994–1996 Yamaha YZ125 two-stroke motocross bikes. With Wiseco's decades of motorsport engineering experience, this kit delivers the quality and consistency needed to get back on the track with confidence.