Wossner forged piston kit designed for superior strength and performance. Engineered for optimal heat transfer from the combustion chamber to cylinder walls. The elliptical design ensures uniform bearing surface under heat expansion, reducing localized pressure and distributing thrust loads evenly to prevent piston collapse. Manufactured in Germany.

Features

• Forged construction for enhanced durability


• Optimized heat transfer for improved performance


• Elliptical design prevents localized pressure and piston collapse


• OEM compression ratio for direct replacement

Specifications

• Bore: 94.96 mm


• Piston Size: 95.02 mm


• Displacement: 400 cm³


• Stroke: 56.50 mm


• Clearance: 0.06 mm


• Wossner Compression Ratio: OEM


• OEM Compression Ratio: 10.80:1


• Dome Volume: +6.40 cm³


• Compression Height: 26.50 mm

Cross-Reference OEM Part Numbers

• Lock: CW22


• Pin: WP009


• Ring Set: 950XSY

Vehicle Fitments

• KTM 600 LC4 (1988-1992)


• KTM 400 LC4 (1993-1996)