The Wossner 8673DA forged piston kit is a high-compression component designed for Yamaha YFM700 Raptor ATVs from 2006 to 2016. Manufactured in Germany, this piston features enhanced heat transfer and structural durability, with an elliptical design that distributes pressure evenly and prevents collapse during thermal expansion.

Features

• Forged high-compression piston for increased durability and strength


• Engineered for efficient heat transfer to cylinder walls


• Elliptical design promotes even pressure distribution during expansion


• Minimizes localized stress and reduces risk of piston collapse


• Manufactured in Germany

Specifications

• Display: 686 cm³


• Bore: Not specified


• 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: 8673DA


• Lock: NCW23


• Pin: WP024


• Ring Set: 1020XSU


• Part No.: 56-W4903+000.WO


• OEM Reference: 1S3-11631-10-00, 4903M10200

Vehicle Fitments

• Yamaha YFM700 Raptor 2006–2016