Wossner piston PW50 40.5mm

Yamaha PW50 models from 1981 to 1997. Designed for two-stroke engine rebuilds requiring an increased bore size, it provides exceptional durability and precise thermal expansion characteristics.

Features

• Forged construction ensures superior strength and wear resistance

• Elliptical design delivers a uniform bearing surface under heat expansion

• Efficient heat transfer from combustion chamber to cylinder walls

• Prevents piston collapse by evenly distributing thrust loads

• Manufactured in Germany

Specifications

• Bore Size: 40.50mm

• Actual Piston Size: 40.45mm

• 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: RSB4100

Cross-Reference OEM Part Numbers

• Part No: 8267D100

Vehicle Fitments

• Yamaha PW50 (1981–1997)