Wossner forged piston kit designed for high-performance applications, offering superior strength and optimized heat transfer. The elliptical design ensures a uniform bearing surface under heat expansion, reducing localized pressure and preventing piston collapse. Manufactured in Germany for precision and durability.

Features

• Forged piston for enhanced strength and durability


• Optimized heat transfer to cylinder walls for improved performance


• Elliptical design for even thrust load distribution


• Manufactured in Germany

Specifications

• Bore Size: 89mm


• Actual Bore: 88.94mm


• Display (cm³): 398


• Stroke (mm): 64.00


• Clearance (mm): 0.06


• Wossner Compression Ratio: OEM


• OEM Compression Ratio: 11.00:1


• Dome Volume (cm³): +7.00


• Compression Height (mm): 27.50


• Theoretical Weight: N/A


• Lock Part Number: CW20


• Pin Part Number: WP038


• Ring Set Part Number: 890XSY


• Part Number: 56-W4733+00A.WO

Cross-Reference OEM Part Numbers

• 57530007000

Vehicle Fitments

• KTM LC4 400 1998-2001