The Wossner 78mm Bore Piston Kit (Part No. 8644DA) is a high-performance forged piston designed for the Kawasaki KLX300R. Engineered for strength and durability, it optimizes heat transfer and features an elliptical design to ensure uniform load distribution, reducing localized pressure and preventing piston collapse. Manufactured in Germany, this piston maintains the OEM compression ratio for reliable 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: 78mm


• Actual Bore Diameter: 77.94mm


• Compression Ratio: OEM


• OEM Compression Ratio: 11.0:1


• Displacement: 290cc


• Stroke: 61.20mm


• Clearance: 0.06mm


• Dome Volume: -4.80cm³


• Compression Height: 23.00mm

Cross-Reference OEM Part Numbers

• Lock P/N: CW17


• Pin P/N: WP090


• Ring Set P/N: 780XDS


• OEM Part Numbers: 13001-1463, 4630M07800

Vehicle Fitments

• Kawasaki KLX300R (1997-2006)