PISTON KIT 86-88 YZ125 57.00 WOSSNER 8118D100 YAMAHA MX

This Wossner 57.00mm (+1.00 oversize) forged piston kit is specifically engineered for Yamaha YZ125 two-stroke models from 1986 to 1988. Made in Germany, it features a high-strength forged construction with an elliptical design that enhances structural integrity, promotes even distribution of combustion forces, and improves thermal management. Its design ensures consistent and reliable performance under demanding riding conditions.

Features

• Forged piston for high strength and durability

• Elliptical design provides uniform bearing surface during heat expansion

• Even thrust load distribution helps prevent localised stress and piston collapse

• Designed for effective combustion heat transfer to the cylinder walls

• Manufactured in Germany

Specifications

• Bore: 57.00mm

• Actual diameter: 56.94mm

• 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+100.WO

• Wossner Piston Kit No.: 8118D100

• Lock: CW16

• Pin: WP036

• Ring Set: RSB5700

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.