PISTON KIT 87-90 TRX250 66.50, WOSSNER 8189D050 HONDA ATV

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)