PISTON KIT KTM 400 76-81 83.00, WOSSNER 8293D100 KTM 390

This Wossner 83mm bore forged piston kit (part number 8293D100, +1mm oversize) is engineered for enhanced durability and thermal efficiency, making it suitable for high-performance applications. Designed with an elliptical profile for optimal load distribution under heat expansion, it minimises piston wear and collapse. Manufactured in Germany, it includes precise components tailored for both KTM and Yamaha models.

Features

• Forged piston designed for increased strength and reliability

• Superior heat transfer for improved combustion efficiency

• Elliptical design distributes thrust loads uniformly

• Made in Germany

Specifications

• Bore: 83mm

• Bore Size: 82.90mm

• Compression Ratio: 13:1 (Yamaha YZF R6 4-Stroke)

• Compression Height: 37.70mm

• Clearance: 0.10mm

• Stroke: 74.00mm

• Displacement: 389cm³ (KTM 390), 355cm³ (KTM 400)

• Clip Part Number: CW18

• Piston Pin: WP0042

• Ring Set: RSC8300

Cross-Reference OEM Part Numbers

• 56-W9877.100.WO

Vehicle Fitments

• KTM GS / MC 390 / 400 (1976–1981)

• Yamaha YZF R6 (2006–2011, 4-Stroke)