WOSSNER 67mm PISTON KIT HONDA TRX250R 1987-1990

Wossner forged piston kit for Honda ATC250R and TRX250R models from 1987 to 1990, featuring an oversize bore of 67.00 mm (+1.00 mm). Engineered for demanding 2-stroke performance, this piston utilises a forged construction and an elliptical profile to manage heat expansion effectively. This design helps distribute thrust loads evenly and minimise stress concentrations, ensuring long-lasting engine reliability. Manufactured in Germany to exacting standards.

Features

• Forged piston for high strength and thermal resistance

• Optimised for effective heat transfer from combustion chamber to cylinder wall

• Elliptical design provides uniform expansion and prevents localised pressure

• Intended for high-performance 2-stroke engine use

• Made in Germany

Specifications

• Bore: 67.00 mm

• Actual Bore Diameter: 66.94 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.: 8189D100

• Lock P/N: CW18

• Pin P/N: WP033

• Ring Set P/N: RSB6700 (x2)

• Alternate Part No.: 56-W562.P4.WO

Vehicle Fitments

• Honda ATC250R (1987–1990)

• Honda TRX250R (1987–1990)