PISTON KIT 01-04 YZF250 79.00 FORGED WOSSER 8559D200 3-RING

Wossner 79mm Bore Piston Kit (PN# 8559D200) is designed for Yamaha YZ250F and WF250F models from 2001 to 2004. This forged piston offers superior strength and heat transfer efficiency, ensuring optimal performance and durability. Its elliptical design provides a uniform bearing surface under heat expansion, reducing localized pressure and distributing thrust loads evenly to prevent piston collapse. Manufactured in Germany, this piston meets OEM compression standards.

Features

• High-strength forged piston for durability and performance
• Optimized heat transfer to cylinder walls
• Elliptical design prevents piston collapse and ensures even load distribution
• Manufactured in Germany

Specifications

• Bore: 79mm
• Actual diameter: 78.96mm
• Display (cm³): 249
• Stroke (mm): 53.6
• Clearance (mm): 0.04
• Compression Ratio: OEM
• OEM Compression Ratio: 12.50:1
• Dome Volume (cm³): -4.70
• Compression Height (mm): 22.20
• Includes 3 piston rings

Cross-Reference OEM Part Numbers

• Lock: CW16
• Pin: WP059
• Ring Set: 790XAS-2

Vehicle Fitments

• Yamaha YZ250F (2001-2004)
• Yamaha WF250F (2001-2004)