PISTON KIT 08-09 WR250X 77 HC, FORGED WOSSNER 8772DA

Wossner forged piston kit with a 77.00mm bore and 76.96mm diameter, designed for Yamaha WR250X models. This Pro Series piston is engineered for high performance, featuring superior strength and design. Manufactured in Germany, it ensures optimal heat transfer to cylinder walls. Its elliptical design provides a uniform bearing surface under heat expansion, reducing localized pressure and evenly distributing thrust loads to prevent piston collapse.

Features

• Forged construction for superior strength
• Optimized heat transfer for efficient combustion
• Elliptical design for uniform load distribution
• High compression ratio for increased performance
• Manufactured in Germany

Specifications

• Bore: 77.00mm
• Diameter: 76.96mm
• Display (cm³): 249
• Stroke (mm): 53.60
• Clearance (mm): 0.04
• Wossner Compression Ratio: 13.50:1
• OEM Compression Ratio: 11.80:1
• Dome Volume (cm³): -4.50
• Compression Height (mm): 22.20

Cross-Reference OEM Part Numbers

• Wossner Piston Yamaha WR250X (PN# 8772DA)
• Lock P/N: CW17
• Pin P/N: WP083
• Ring Set P/N: 770XAS-2

Vehicle Fitments

• Yamaha WR250X (2008-2009)