Wossner forged piston kit with a 95.00mm bore and 94.95mm diameter, designed for Yamaha ATV/UTV 4-stroke models. Manufactured in Germany, this piston offers superior strength and design, ensuring optimal heat transfer to cylinder walls. Its elliptical design provides a uniform bearing surface under heat expansion, reducing localized pressure and evenly distributing thrust loads to prevent piston collapse.

Features

• Forged construction for superior strength


• Optimized heat transfer for efficient combustion


• Elliptical design for uniform load distribution


• Manufactured in Germany

Specifications

• Bore: 95.00mm


• Diameter: 94.95mm


• Display (cm³): 449


• Stroke (mm): 63.40


• Clearance (mm): 0.05


• Wossner Compression Ratio: 13.50:1


• OEM Compression Ratio: 11.40:1


• Dome Volume (cm³): -1.60


• Compression Height (mm): 25.10

Cross-Reference OEM Part Numbers

• Wossner Piston Yamaha YFZ450 (PN# 8657DA)


• Lock P/N: CW20


• Pin P/N: WP038


• Ring Set P/N: 950ADS-2


• Rod P/N: P4030

Vehicle Fitments

• Yamaha YFZ450 (2006-2012)


• Yamaha YFZ450R (2006-Present)