Wossner forged piston kit with a 98mm bore (97.96mm actual) is designed for Yamaha YZ426F and WR426F models from 2000 to 2002. Engineered for strength and optimal heat transfer, this piston features an elliptical design that ensures even load distribution, reducing localized pressure and preventing piston collapse. Manufactured in Germany, it maintains OEM compression specifications.

Features

• Forged construction for durability and high performance


• Optimized heat transfer to cylinder walls for improved efficiency


• Elliptical design ensures uniform bearing surface and prevents piston collapse


• Manufactured in Germany for high-quality standards

Specifications

• Bore Size: 98mm (97.96mm actual)


• Display (Displacement): 426 cm³


• Stroke: 60.10mm


• Clearance: 0.04mm


• Compression Ratio: OEM specification (12.50:1)


• Dome Volume: -7.00 cm³


• Compression Height: 24.10mm

Cross-Reference OEM Part Numbers

• Piston Kit: 8525D300


• Lock: CW19


• Pin: WP037


• Ring Set: 980XDS

Vehicle Fitments

• Yamaha YZ426F (2000-2002)


• Yamaha WR426F (2000-2002)