This Wossner forged piston kit is a +1.50mm oversize replacement for Yamaha PW50 models from 1981 to 1995. Precision-built in Germany, it is ideal for engines requiring a significant overbore while maintaining durability and performance in small-displacement two-stroke applications.

Features

• Forged piston construction for enhanced strength and longevity

• Elliptical design ensures a consistent bearing surface during heat expansion

• Optimised for efficient heat dissipation from the combustion chamber to cylinder walls

• Evenly distributes thrust loads to reduce the risk of piston collapse

• Manufactured in Germany

Specifications

• Bore Size: 41.50mm

• Actual Piston Size: 41.45mm

• Stroke: 39.20mm

• Piston Clearance: 0.05mm

• Wossner Compression Ratio: 2-stroke

• OEM Compression Ratio: 2-stroke

• Compression Height: 24.90mm

• Lock Part Number: CW10

• Pin Part Number: WP105

• Ring Set Part Number: RSB4150

Cross-Reference OEM Part Numbers

• Part No: 8267D150

Vehicle Fitments

• Yamaha PW50 (1981–1995)