Forged piston kit set of four with a standard 74.50 mm bore (measured piston diameter 74.46 mm), engineered for high-performance road and race use. Designed to withstand extreme thermal and mechanical loads, with an elliptical profile for consistent bearing surfaces and balanced thrust load distribution. Must be used with the OEM ring set.

Features

• Forged construction for maximum strength and durability


• Optimised heat transfer from combustion chamber to cylinder walls


• Elliptical profile for consistent bearing surface under heat expansion


• Even thrust load distribution to help prevent piston collapse


• Manufactured in Germany


• Supplied as a set of four pistons


• Must be used with OEM ring set

Specifications

• Bore: 74.50 mm


• Measured diameter: 74.46 mm


• Engine displacement (reference): 999 / 1052 cm³


• Stroke: 57.30 mm


• Clearance: 0.04 mm


• Compression ratio (Wössner): 14.00:1


• Compression ratio (OEM reference): 12.80:1


• Dome volume: −4.40 cm³


• Compression height: 22.35 mm


• Quantity in kit: 4 pistons

Cross-Reference OEM Part Numbers

• 56-W9933.000.WO


• Wössner K8790DA-4


• Clips: CW15


• Piston pin: WP011


• Ring set: OEM (use original equipment rings)

Vehicle Fitments

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  Suzuki GSX-R1000 2009–2016