WOSSNER 69.5mm PISTON KIT YAMAHA YZ250 83-87

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)

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.