Wossner 66.40mm (66.34mm) forged piston kit is designed for Honda CR 250R models from 2005 to 2007. This single-ring piston is engineered for strength and precision, ensuring efficient heat transfer to the cylinder walls, providing uniform expansion, and reducing localized pressure. The elliptical design distributes thrust loads evenly, preventing piston collapse. Manufactured in Germany, it meets high-quality standards for reliable performance.

Features

• Wossner forged piston for superior strength and durability


• Single-ring design for optimized performance


• Optimized heat transfer for improved combustion efficiency


• Elliptical design for uniform bearing surface and reduced localized pressure


• Precision-engineered to prevent piston collapse


• Made in Germany

Specifications

• Bore Size: 66.40mm (66.34mm)


• Standard Size (STD)


• Displacement: 249cc


• Stroke: 72.00mm


• Clearance: 0.06mm


• Compression Ratio: 2-stroke


• Compression Height: 38.00mm


• Lock Part Number: CW18


• Pin Part Number: WP033


• Ring Set Part Number: RSB6640


• Gasket Part Number: D2009


• Rod Part Number: P2020


• Theoretical Weight: Not specified

Cross-Reference OEM Part Numbers

• 13110-KSK-730


• 860M06640

Vehicle Fitments

• Honda CR 250R (2005-2007)