WOSSNER 57mm PISTON KIT YAMAHA YZ125 1983 & 1985

This Wossner forged piston kit features a 57mm bore (56.94mm) and is designed for use in the Yamaha YZ125 models from 1983 and 1985. Manufactured in Germany, this piston is engineered for improved heat transfer, uniform bearing surface, and even thrust load distribution, reducing the risk of piston collapse under high-performance conditions.

Features

• Forged piston construction for superior strength

• Engineered for optimal combustion chamber heat transfer

• Elliptical design ensures uniform bearing surface under heat expansion

• Made in Germany

Specifications

• Bore size: 57mm (56.94mm)

• Display volume: 83 cm³

• Stroke: 84.00 mm

• Clearance: 0.06 mm

• Compression height: 30.80 mm

• Theoretical weight: Not specified

• Compression ratio: 2-stroke (Wossner and OEM)

Cross-Reference OEM Part Numbers

• Piston: 8119D100

• Lock: CW16

• Pin: WP036

• Ring Set: RSB5700

Vehicle Fitments

• Yamaha YZ125 1983

• Yamaha YZ125 1985