The Wossner 8666DB forged piston kit with a 77.01mm bore is designed for Suzuki RM-Z250 models from 2007 to 2009. Made in Germany, this high-performance piston ensures efficient heat dissipation and strength. Its elliptical design provides a uniform bearing surface during thermal expansion, reducing stress concentrations and preventing piston failure.

Features

• Forged piston for enhanced strength and longevity


• Optimized for efficient heat transfer to cylinder walls


• Elliptical shape distributes load evenly under thermal expansion


• Reduces localized pressure and risk of piston collapse


• Manufactured in Germany

Specifications

• Bore: 77.01 mm


• Actual Bore Diameter: 76.97 mm


• Display: 249 cm³


• Hub Stroke: 53.60 mm


• Clearance: 0.04 mm


• Compression Height: 19.60 mm


• Dome Volume: -3.30 cm³


• Wossner Compression Ratio: OEM


• OEM Compression Ratio: 13.40:1

Cross-Reference OEM Part Numbers

• Piston: 8666DB


• Lock: CW16


• Pin: WP059


• Ring Set: 770XAS


• Rod: P4004


• Main Bearing: 2 x MB830046


• Part No.: 56-W4921.B.WO

Vehicle Fitments

• Suzuki RM-Z250 2007–2009