PISTON KIT 86-88 YZ125 56.50, WOSSNER 8118D050 YAMAHA MX

This Wossner 56.50mm (+0.50 oversize) forged piston kit is designed for Yamaha YZ125 models from 1986 to 1988. Featuring a forged construction and elliptical design, this piston is built to withstand thermal and mechanical stress while ensuring efficient combustion heat transfer and even thrust load distribution. Manufactured in Germany, it is suited for two-stroke engine performance and reliability.

Features

• Forged piston for increased strength and durability

• Elliptical design provides uniform bearing surface under heat expansion

• Even thrust load distribution reduces localised pressure and risk of piston collapse

• Optimised for efficient combustion heat transfer to cylinder walls

• Manufactured in Germany

Specifications

• Bore: 56.50mm

• Actual diameter: 56.44mm

• 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+050.WO

• Wossner Piston Kit No.: 8118D050

• Lock: CW16

• Pin: WP036

• Ring Set: RSB5650

Vehicle Fitments

• Yamaha YZ125 1986

• Yamaha YZ125 1987

• Yamaha YZ125 1988