This Wossner piston kit is designed for Honda CR250R and ATAC250 models from 1984 to 1985, featuring a 67.25 mm bore and an actual piston diameter of 66.19 mm. Forged in Germany, the piston is built for strength and effective thermal performance, facilitating efficient heat transfer from the combustion chamber to the cylinder walls. The elliptical design ensures uniform bearing surface during heat expansion, reducing localised pressure and helping to prevent piston collapse.

Features

• Forged piston for enhanced strength and longevity

• Engineered for efficient combustion heat dissipation

• Elliptical design distributes thrust loads evenly

• Manufactured in Germany

Specifications

• Bore size: 67.25 mm

• Actual piston diameter: 66.19 mm

• Display (cm³): 246

• Stroke: 72.00 mm

• Clearance: 0.06 mm

• Compression height: 38.00 mm

• Wossner compression ratio: 2-stroke

• OEM compression ratio: 2-stroke

Cross-Reference OEM Part Numbers

• Wossner Piston Part Number: 8156D125

• Lock Part Number: CW18

• Pin Part Number: WP033

• Ring Set Part Number: RSB6725 x2

• Alternate Part Number: 56-W526.P5.WO

Vehicle Fitments

• Honda CR250R 1984

• Honda CR250R 1985

• Honda ATAC250 1984

• Honda ATAC250 1985

• Honda ATC250R 1985

• Honda ATC250R 1986

• Honda TRX250R 1985

• Honda TRX250R 1986