The Wossner 8673D100 forged piston kit features a 103.00mm bore and is designed for high-compression applications in Yamaha YFM700 Raptor ATVs from 2006 to 2016. Precision-engineered in Germany, this piston enhances strength, heat dissipation, and durability, while its elliptical shape ensures even load distribution and resistance to collapse under thermal expansion.

Features

• Forged high-compression piston for increased performance and strength


• Designed for effective heat transfer from combustion chamber to cylinder walls


• Elliptical design provides uniform bearing surface under heat expansion


• Reduces localized pressure and prevents piston collapse


• Manufactured in Germany

Specifications

• Bore: 103.00 mm


• Actual Bore Diameter: 102.94 mm


• Display: 686 cm³


• Hub Stroke: 84.00 mm


• Clearance: 0.06 mm


• Compression Height: 27.50 mm


• Dome Volume: +7.10 cm³


• Wossner Compression Ratio: 11.00:1


• OEM Compression Ratio: 9.20:1


• Theoretical Weight: Not specified

Cross-Reference OEM Part Numbers

• Piston: 8673D100


• Lock: CW23


• Pin: WP024


• Ring Set: 1030XSU


• Rod: P4031


• Part No.: 56-W4903+100.WO

Vehicle Fitments

• Yamaha YFM700 Raptor 2006–2016