Wossner forged piston kit designed for Yamaha YFM350 Warrior and Big Bear models from 1986 to 2005. Manufactured in Germany, this piston offers superior strength and heat transfer efficiency. The elliptical design ensures even load distribution, reducing localized pressure and preventing piston collapse.

Features

• Forged construction for enhanced durability and strength


• Optimized heat transfer for improved performance


• Elliptical design for uniform bearing surface and reduced wear


• Designed for 4-stroke engines

Specifications

• Bore Size: 83.01 mm (+0.01 mm oversize)


• Actual Bore: 82.95 mm


• Stroke: 64.50 mm


• Clearance: 0.06 mm


• Compression Height: 28.30 mm


• Dome Volume: +2.30 cm³


• Compression Ratio: 9.20:1 (OEM)


• Displacement: 349 cm³


• Made in Germany

Cross-Reference OEM Part Numbers

• Wossner Part No.: 8605DB


• Lock P/N: CW19


• Pin P/N: WP026


• Ring Set P/N: 830XSY


• Connecting Rod P/N: P4034

Vehicle Fitments

• Yamaha YFM350 Warrior (1986-2005)


• Yamaha Big Bear 350 (1986-2005)