Wossner forged piston kit designed for KTM 400 LC4 (1998-2001) models. This high-compression Pro Series piston is engineered for superior strength and optimal heat transfer. Featuring an elliptical design, it ensures a uniform bearing surface under heat expansion, reducing localized pressure and preventing piston collapse. Manufactured in Germany.

Features

• High-compression Pro Series piston


• Forged 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: 89.00mm


• Actual Bore Diameter: 88.94mm


• Displacement: 398 cm³


• Stroke: 64.00mm


• Clearance: 0.06mm


• Wossner Compression Ratio: 12.50:1


• OEM Compression Ratio: 11.00:1


• Dome Volume: +12.20 cm³


• Compression Height: 27.50mm


• Lock Part Number: CW20


• Pin Part Number: WP038


• Ring Set Part Number: 890XSY

Cross-Reference OEM Part Numbers

• 57530007000

Vehicle Fitments

• KTM 400 LC4 (1998-2001)