WOSSNER 66.5mm 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 66.50 mm (+0.50 mm). This piston is crafted for high-performance 2-stroke engines and provides superior heat management and structural integrity. The elliptical piston shape helps ensure uniform expansion and reduces localised stress, improving durability during demanding operation. Manufactured in Germany to precise specifications.

Features

• High-strength forged piston design

• Enhanced combustion chamber heat transfer to cylinder walls

• Elliptical shape for consistent bearing surface under heat expansion

• Developed specifically for 2-stroke engines

• Manufactured in Germany

Specifications

• Bore: 66.50 mm

• Actual Bore Diameter: 66.44 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.: 8189D050

• Lock P/N: CW18

• Pin P/N: WP033

• Ring Set P/N: RSB6650 (x2)

• Rod P/N: P2042

• Alternate Part No.: 56-W562.P2.WO

Vehicle Fitments

• Honda ATC250R (1987–1990)

• Honda TRX250R (1987–1990)

Majority of our listings are for a direct replacement for your original part.

Our parts are made of quality and are designed to meet or exceed the original OEM Standards.

Our products are often a cost effective alternative to genuine OEM Parts.

Please note: the models of bike we state in our listings are for general guidance only. Please make sure this item will fit your bike before purchasing. Also, we cannot guarantee fitment to any non-UK models.