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)

Majority of our listings are for a direct replacement for your original part.

Our parts are made of quality and are designed to meet or exceed the original OEM Standards.

Our products are often a cost effective alternative to genuine OEM Parts.

Please note: the models of bike we state in our listings are for general guidance only. Please make sure this item will fit your bike before purchasing. Also, we cannot guarantee fitment to any non-UK models.