PISTON KIT 86-88 YZ125 58.00, WOSSNER 8118D200 YAMAHA MX

This Wossner 58.00mm (+2.00 oversize) forged piston kit is designed for Yamaha YZ125 models from 1986 to 1988. Manufactured in Germany, the piston features a forged construction for maximum strength and durability. Its elliptical design ensures an even bearing surface during thermal expansion, helping to distribute thrust loads uniformly and prevent piston collapse. The design also facilitates efficient heat dissipation from the combustion chamber to the cylinder walls, making it suitable for high-performance two-stroke engine applications.

Features

• Forged piston for superior strength and durability

• Elliptical shape provides consistent bearing surface during heat expansion

• Reduces localised stress and distributes thrust loads evenly

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

• Manufactured in Germany

Specifications

• Bore: 58.00mm

• Actual diameter: 57.94mm

• 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+200.WO

• Wossner Piston Kit No.: 8118D200

• Lock: CW16

• Pin: WP036

• Ring Set: RSB5800

Vehicle Fitments

• Yamaha YZ125 1986

• Yamaha YZ125 1987

• Yamaha YZ125 1988