WOSSNER 69.25mm PISTON KIT YAMAHA YZ250 83-87

Wossner forged piston kit designed for Yamaha YZ250 models from 1983 to 1987. This kit features a 69.25 mm bore and is precision-engineered for durability and efficient heat transfer. Its elliptical shape ensures consistent bearing surface contact under thermal expansion, reducing the risk of piston collapse and improving engine performance. Manufactured in Germany, this kit includes all essential components for a reliable rebuild.

Features

• Forged piston construction for increased strength

• Superior heat transfer design for improved thermal performance

• Elliptical piston profile to reduce localised pressure and distribute thrust loads

• Engineered for 2-stroke engine applications

• Made in Germany

Specifications

• Bore: 69.25 mm

• Actual Bore Diameter: 69.19 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.: 8133D125

• Lock P/N: CW18

• Pin P/N: WP033

• Ring Set P/N: RSB6925 (x2)

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

• Alternate Part No.: 56-W560+100.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.