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

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  Yamaha R1 YZF1000 2004–2006