The Wossner 86.50mm Bore Piston Kit (Part No. 8599D050) is a high-performance forged piston designed for Honda TRX400 4x4 models from 1995 to 2003. Engineered for strength and durability, it optimizes heat transfer within the combustion chamber and features an elliptical design to ensure even load distribution, reducing localized pressure and preventing piston collapse. Manufactured in Germany, this piston maintains the OEM compression ratio for reliable engine performance.

Features

• High-strength forged piston construction


• Optimized heat transfer for improved combustion efficiency


• Elliptical design for even thrust load distribution


• Manufactured in Germany

Specifications

• Bore Size: 86.50mm


• Actual Bore Diameter: 86.43mm


• Compression Ratio: OEM


• Displacement: 394cc


• Stroke: 68.00mm


• Clearance: 0.07mm


• Dome Volume: +0.00cm³


• Compression Height: 25.00mm

Cross-Reference OEM Part Numbers

• Lock P/N: CW19


• Pin P/N: WP050


• Ring Set P/N: 865XSY

Vehicle Fitments

• Honda TRX400 4x4 (1995-2003)