PISTON KIT 92-98 YZ250 70.00, WOSSNER 8023D200 YAMAHA MX

This Wossner forged piston kit is designed for Yamaha YZ250 (1992–1998) and WR250 (1992–1999) two-stroke models with a +2.00mm oversize bore. Manufactured in Germany, the piston offers superior strength and precise thermal expansion control through its elliptical design. This design ensures even load distribution, reduces pressure points, and enhances durability under high-performance conditions. The kit promotes effective heat transfer from the combustion chamber to the cylinder wall for consistent engine performance.

Features

• Forged piston construction for high durability and strength

• Elliptical profile maintains uniform bearing surface under heat

• Reduces localised pressure and prevents piston collapse

• Efficient combustion heat transfer to cylinder walls

• German precision engineering

Specifications

• Bore Size: 70.00mm (+2.00mm oversize)

• Actual Diameter: 69.94mm

• 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: 8023D200

• Lock: CW18

• Pin: WP033

• Ring Set: RSB7000 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