PISTON KIT/4 YAM YZF1000 77.00, WOSSNER K8752DA-4 COMP 13:1

The Wossner K8752DA-4 piston kit is a standard-size forged piston set designed for Yamaha R1 YZF1000 models from 2004 to 2006. With a 77.00mm bore and a raised compression ratio of 13.5:1, this high-performance kit enhances power output and combustion efficiency for demanding four-stroke applications. Manufactured in Germany, it includes four pistons along with all necessary installation components.

Features

• Forged high-performance pistons with skirt coating

• Elliptical design promotes uniform thermal expansion and balanced load distribution

• Engineered for optimised heat transfer from combustion chamber to cylinder walls

• Designed for high-compression four-stroke engines

• Includes piston pins, clips, and rings

Specifications

• Bore size: 77.00mm (Standard)

• Measured bore: 76.96mm

• Display displacement: 998 / 1023 cm³

• Stroke: 53.60mm

• Clearance: 0.04mm

• Compression ratio: 13.5:1

• OEM compression ratio: 12.5:1

• Dome volume: –4.70 cm³

• Compression height: 22.80mm

• Quantity: 4 pistons per kit

• Made in Germany

Cross-Reference OEM Part Numbers

• Part No. 56-W9876.000.WO

• Clip: CW17

• Piston Pin: WP0111

• Ring Set: 770XAS-2

Vehicle Fitments

• Yamaha R1 YZF1000 2004–2006