Wossner forged piston kit designed for superior strength and high compression 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


• High compression design for increased efficiency

Specifications

• Bore: 89.94 mm


• Piston Size: 90.00 mm


• Displacement: 398 cm³


• Stroke: 62.60 mm


• Clearance: 0.06 mm


• Wossner Compression Ratio: 13.50:1


• OEM Compression Ratio: 12.50:1


• Dome Volume: +0.50 cm³


• Compression Height: 25.30 mm


• Theoretical Weight: 247.00 g

Cross-Reference OEM Part Numbers

• Lock: CW20


• Pin: WP029


• Ring Set: 900XSY


• OEM Part Numbers: 13001-S006, 4714M09000, 12111-29F00-0F0

Vehicle Fitments

• Suzuki DR-Z 400E (2000-2014)


• Suzuki DR-Z 400S (2000-2002)


• Suzuki LT-Z 400 (2002)