PISTON KIT 83-87 YZ250 69.50, WOSSNER 8133D150 YAMAHA MX

Wossner forged piston kit designed for Yamaha YZ250 models from 1983 to 1987. This kit features a 69.50 mm bore, offering increased displacement for performance tuning. It is engineered to deliver enhanced strength, efficient heat transfer, and uniform load distribution. Its elliptical profile accommodates thermal expansion, reducing stress and extending piston lifespan. Manufactured in Germany with high-precision standards.

Features

• Forged piston for increased durability and performance

• Designed for optimal combustion heat transfer

• Elliptical shape minimises localised pressure and distributes thrust loads

• Engineered for 2-stroke engine use

• Manufactured in Germany

Specifications

• Bore: 69.50 mm

• Actual Bore Diameter: 69.44 mm

• Compression Height: 36.00 mm

• Display Volume: 246 cm³

• Stroke: 68.00 mm

• Clearance: 0.06 mm

• Compression Ratio: 2-stroke (Wossner and OEM)

Cross-Reference OEM Part Numbers

• Piston Kit Part No.: 8133D150

• Lock P/N: CW18

• Pin P/N: WP033

• Ring Set P/N: RSB6950 (x2)

• Rod P/N: P2048 (for 1983–1989 models)

• Alternate Part No.: 56-W560+150.WO

Vehicle Fitments

• Yamaha YZ250 (1983–1987)