Wiseco Pistons PK1809 Top End Piston Kit for Yamaha YZ125 56mm

The Wiseco PK1809 Pro-Lite Top End Piston Kit is designed for 1986-1988 Yamaha YZ125 motorcycles with a 56mm bore size. This complete kit provides everything needed for a top-end rebuild or overbore application, delivering the performance and reliability Wiseco is known for in two-stroke racing applications.

Kit Includes:

• Forged aluminum piston (559M series) engineered for high-performance two-stroke applications
• Piston rings designed for optimal seal and minimal blow-by
• Wrist pin and circlips for secure piston pin retention
• Complete top end gasket set for proper sealing

Key Features:

• 56mm bore diameter for precise fitment
• Pro-Lite forged piston construction for strength and reduced reciprocating weight
• Race-proven design for motocross and off-road competition
• All components precision-matched for optimal performance

Wiseco pistons are manufactured in the USA using advanced forging techniques that create a stronger, more durable piston compared to cast alternatives. The Pro-Lite series is specifically engineered to reduce weight while maintaining structural integrity, resulting in improved throttle response and engine acceleration.