PISTON KIT 83-87 YZ250 68.00, WOSSNER 8133DA YAMAHA MX 39X-11630-00-00

This Wossner 68.00mm standard size forged piston kit is designed for Yamaha YZ250 models from 1983 to 1987. Manufactured in Germany, it features a high-strength forged construction and an elliptical piston design to ensure uniform load distribution during heat expansion, reduce localised stress, and promote consistent engine performance. The piston supports efficient thermal transfer from the combustion chamber to the cylinder walls, making it suitable for demanding two-stroke applications.

Features

• Forged piston for high durability and structural strength

• Elliptical design maintains a uniform bearing surface under thermal expansion

• Distributes thrust loads evenly to minimise stress and prevent piston collapse

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

• Manufactured in Germany

Specifications

• Bore: 68.00mm

• Actual diameter: 67.94mm

• Displacement: 246 cm³

• Stroke: 68.00mm

• Clearance: 0.06mm

• Compression height: 36.00mm

• Compression ratio: 2-stroke

Cross-Reference OEM Part Numbers

• Piston Kit Part No.: 56-W560+000.WO

• Wossner Piston Kit No.: 8133DA

• Lock: CW18

• Pin: WP033

• Ring Set: RSB6800 x2

• Rod: P2048 (for 1983–1989 models)

• Cross-reference numbers: 39X-11630-00-00, 560M06800

Vehicle Fitments

• Yamaha YZ250 1983

• Yamaha YZ250 1984

• Yamaha YZ250 1985

• Yamaha YZ250 1986

• Yamaha YZ250 1987