PISTON 98-00 YZF/WR400F 92 HC WOSSNER PISTON KIT 8639DC

Wossner forged piston kit designed for high compression and performance. Engineered for optimal heat transfer to cylinder walls, ensuring efficient combustion. The elliptical design provides a uniform bearing surface under heat expansion, reducing localized pressure and evenly distributing thrust loads to prevent piston collapse. Manufactured in Germany to high-quality standards.

Features

• High-compression forged piston for enhanced performance
• Optimized heat transfer for efficient combustion
• Elliptical design to prevent piston collapse
• Manufactured in Germany

Specifications

• Bore Size: 92.02mm
• Actual Bore Diameter: 91.97mm
• Displacement: 399 cm³
• Stroke: 60.10mm
• Clearance: 0.05mm
• Wossner Compression Ratio: 13.50:1
• OEM Compression Ratio: 12.50:1
• Dome Volume: -4.60 cm³
• Compression Height: 24.10mm
• Theoretical Weight: Not specified

Included Components

• Lock Part Number: CW18
• Pin Part Number: WP053
• Ring Set Part Number: 920XSY

Vehicle Fitments

• Yamaha WR400F (1998-1999)
• Yamaha YZ400F (1998-1999)

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.