Wossner forged piston kit designed for Kawasaki KLX400 (2003-2006) and Kawasaki KFX400 ATV (2003-2006) models. Engineered for superior strength and optimal heat transfer, these pistons feature an elliptical design to ensure uniform bearing surface under heat expansion, reducing localized pressure and preventing piston collapse. Manufactured in Germany.

Features

• Forged piston for increased strength and durability


• Optimized heat transfer for efficient combustion chamber performance


• Elliptical design for even thrust load distribution and reduced piston collapse


• Manufactured in Germany

Specifications

• Bore Size: 90.00mm


• Actual Bore Diameter: 89.94mm


• Displacement: 398 cm³


• Stroke: 62.60mm


• Clearance: 0.06mm


• Wossner Compression Ratio: OEM


• OEM Compression Ratio: 12.20:1


• Dome Volume: -2.00 cm³


• Compression Height: 25.30mm


• Theoretical Weight: 250.00g


• Lock Part Number: CW20


• Pin Part Number: WP029


• Ring Set Part Number: 900XSY


• Rod Part Number: P4009

Vehicle Fitments

• Kawasaki KLX400 (2003-2006)


• Kawasaki KFX400 ATV (2003-2006)