PISTON KIT 92-98 YZ250 69.00, WOSSNER 8023D100 YAMAHA MX

This Wossner forged piston kit is designed for Yamaha YZ250 (1992–1998) and WR250 (1992–1999) two-stroke models, offering a +1.00mm oversize fitment. Manufactured in Germany, it combines high-strength materials with an elliptical profile for uniform expansion under operating heat. This design minimises stress concentrations, prevents piston collapse, and ensures effective heat transfer from the combustion chamber to the cylinder wall, supporting consistent engine performance.

Features

• Forged piston provides enhanced strength and longevity

• Elliptical design promotes even pressure distribution during thermal expansion

• Helps prevent piston collapse by reducing localised stress

• Optimised for effective combustion heat dissipation

• Precision-manufactured in Germany

Specifications

• Bore Size: 69.00mm (+1.00mm oversize)

• Actual Diameter: 68.94mm

• Compression Height: 36.00mm

• Stroke: 68.00mm

• Displacement: 246 cm³

• Piston Clearance: 0.06mm

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

Cross-Reference OEM Part Numbers

• Piston Kit Part No: 8023D100

• Lock: CW18

• Pin: WP033

• Ring Set: RSB6850 x2

• Rod: P2029

Vehicle Fitments

• 1992 Yamaha WR250

• 1992 Yamaha YZ250

• 1993 Yamaha WR250

• 1993 Yamaha YZ250

• 1994 Yamaha WR250

• 1994 Yamaha YZ250

• 1995 Yamaha WR250

• 1995 Yamaha YZ250

• 1996 Yamaha WR250

• 1996 Yamaha YZ250

• 1997 Yamaha WR250

• 1997 Yamaha YZ250

• 1998 Yamaha WR250

• 1998 Yamaha YZ250

• 1999 Yamaha WR250