Wossner 78.02mm high-compression forged piston kit is designed for enhanced engine performance. Engineered for optimal heat transfer, it ensures efficient cooling of the combustion chamber. The elliptical design provides a uniform bearing surface, reducing localized pressure and distributing thrust loads evenly to prevent piston collapse. Manufactured in Germany for precision and reliability.

Features

• High-compression design for increased engine performance


• Forged construction for enhanced strength and longevity


• Optimized heat transfer for efficient cooling


• Elliptical design prevents piston collapse and ensures even load distribution


• Manufactured in Germany for high-quality standards

Specifications

• Bore Size: 78.02mm


• Actual Bore Diameter: 77.98mm


• Displacement: 249 cm³


• Stroke: 52.20mm


• Clearance: 0.04mm


• Wossner Compression Ratio: 13.90:1


• OEM Compression Ratio: 12.90:1


• Dome Volume: +0.00 cm³


• Compression Height: 19.00mm


• Lock Part Number: CW16


• Pin Part Number: WP059


• Ring Set Part Number: 780XAS


• Rod Part Number: P4001 (2010 - Current)

Cross-Reference OEM Part Numbers

• Part No: 56-W4852.C.WO


• Wossner Part No: 8590DC

Vehicle Fitments

• Honda CRF250R (2004 - 2009)


• Honda CRF250X (2004 - 2009)