PISTON KIT 87-90 TRX250 67.50, WOSSNER 8189D150 HONDA ATV

Wossner forged piston kit for Honda ATC250R and TRX250R models from 1987 to 1990, featuring a 67.50 mm bore (+1.50 mm oversize). This high-performance 2-stroke piston is designed to withstand extreme conditions with forged construction and an elliptical shape for controlled thermal expansion. The design ensures consistent load distribution and prevents piston collapse. Made in Germany to meet rigorous performance standards.

Features

• Forged construction for durability and strength under high stress

• Optimised for heat transfer from combustion chamber to cylinder walls

• Elliptical profile minimises localised stress under heat expansion

• Developed for high-performance 2-stroke engines

• Manufactured in Germany

Specifications

• Bore: 67.50 mm

• Actual Bore Diameter: 67.44 mm

• Compression Height: 33.00 mm

• Display Volume: 246 cm³

• Stroke: 72.00 mm

• Clearance: 0.06 mm

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

Cross-Reference OEM Part Numbers

• Piston Kit Part No.: 8189D150

• Lock P/N: CW18

• Pin P/N: WP033

• Ring Set P/N: RSB6750 (x2)

• Alternate Part No.: 56-W562.P6.WO

Vehicle Fitments

• Honda ATC250R (1987–1990)

• Honda TRX250R (1987–1990)