WOSSNER 77mm PISTON KIT YAMAHA WR250X 08-12, WR250R 08-20, COMP 13.5:1

Wossner forged piston kit with a 77.02mm bore and 76.98mm diameter, designed for Yamaha WR250X models. Manufactured in Germany, this piston offers superior strength and design, ensuring 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
• Manufactured in Germany

Specifications

• Bore: 77.02mm
• Diameter: 76.98mm
• Display (cm³): 249
• Stroke (mm): 53.60
• Clearance (mm): 0.04
• Wossner Compression Ratio: OEM
• OEM Compression Ratio: 11.80:1
• Dome Volume (cm³): -5.90
• Compression Height (mm): 22.90

Cross-Reference OEM Part Numbers

• Wossner Piston Yamaha WR250X (PN# 8729DC)
• Lock P/N: CW17
• Pin P/N: WP083
• Ring Set P/N: 770XAS-2

Vehicle Fitments

• Yamaha WR250X (2008-2009)