This Wossner forged piston kit K8799D400-4 features a 65.00mm bore (+4.00mm oversize) and is designed for HONDA CB750 F/K [2 Valve] models from 1969 to 1978. It delivers a compression ratio increase from OEM, engineered for optimal heat dissipation and structural stability. Manufactured in Germany, this set includes four pistons and associated components for performance-focused rebuilds.

Features

• Forged piston construction for enhanced strength and endurance

• Designed to maximise heat transfer from combustion chamber to cylinder walls

• Elliptical profile provides uniform bearing surface under heat expansion

• Reduces localised pressure and evenly distributes thrust loads

• Prevents piston collapse and maintains structural integrity under stress

• Manufactured in Germany

Specifications

• Bore: 65.00mm (+4.00mm oversize)

• Piston code: Wossner K8799D400-4

• Clip part number: CW15

• Piston pin: WP102

• Ring set: 650XKS

• Displacement: 836 cm³

• Stroke: 63.00 mm

• Clearance: 0.06 mm

• Wossner compression ratio: 10.30:1

• OEM compression ratio: 9.20:1

• Dome volume: -5.30 cm³

• Compression height: 23.50 mm

Cross-Reference OEM Part Numbers

• Part No. 56-W9881.400.WO

Vehicle Fitments

• HONDA CB750 F [2 Valve] 1969–1978

• HONDA CB750 K [2 Valve] 1969–1978