PISTON KIT 86-88 YZ125 56.75 WOSSNER 8118D075 YAMAHA MX

This Wossner 56.75mm (+0.75 oversize) forged piston kit is designed for Yamaha YZ125 models from 1986 to 1988. Featuring a forged build and elliptical design, the piston is engineered for thermal expansion control, even thrust load distribution, and reliable performance in two-stroke engines. Manufactured in Germany, it ensures efficient heat transfer from the combustion chamber to the cylinder walls under demanding conditions.

Features

• Forged piston construction for enhanced strength and durability

• Elliptical design provides consistent bearing surface under thermal expansion

• Even distribution of thrust loads minimises localised stress and prevents piston collapse

• Optimised for efficient heat transfer from combustion chamber to cylinder walls

• Manufactured in Germany

Specifications

• Bore: 56.75mm

• Actual diameter: 56.69mm

• Displacement: 123 cm³

• Stroke: 50.00mm

• Clearance: 0.06mm

• Compression height: 30.00mm

• Compression ratio: 2-stroke

Cross-Reference OEM Part Numbers

• Piston Kit Part No.: 56-W559+075.WO

• Wossner Piston Kit No.: 8118D075

• Lock: CW16

• Pin: WP036

• Ring Set: RSB5675

Vehicle Fitments

• Yamaha YZ125 1986

• Yamaha YZ125 1987

• Yamaha YZ125 1988

Majority of our listings are for a direct replacement for your original part.

Our parts are made of quality and are designed to meet or exceed the original OEM Standards.

Our products are often a cost effective alternative to genuine OEM Parts.

Please note: the models of bike we state in our listings are for general guidance only. Please make sure this item will fit your bike before purchasing. Also, we cannot guarantee fitment to any non-UK models.