VALVE EXHAUST YZF400 426 98-02, KIBBLEWHITE 80-8057H

This White Diamond® Stainless Steel Exhaust Valve is designed for Yamaha® WR™ and YZ™ 400/426 models from 1998 to 2002. CNC machined from a single forging of EV8 Stainless Steel, it offers excellent heat and corrosion resistance. The valve features a high-quality hard chrome finish applied via a 360-degree anode process to ensure consistent durability. Developed using Finite Element Analysis and tested for flow efficiency, this valve supports reliable exhaust performance under demanding conditions.

Features

• CNC machined from a one-piece forging of EV8 Stainless Steel

• High resistance to heat and corrosion

• Hard chrome finish applied with a 360-degree anode for uniform coating

• Designed using Finite Element Analysis (FEA)

• Flow-optimised profiles tested on a computerised flow bench

• Recommended for use with Kibblewhite valve spring kits (Part No. 65-724)

Specifications

• Head Diameter: 28.00mm / 1.102"

• Stem Diameter: 5.00mm / 0.1955"

• Tulip Angle: 25 degrees

• Overall Length (OL): 81.85mm / 3.220"

• Standard size

Cross-Reference OEM Part Numbers

• Kibblewhite Part No. 80-8057H

Vehicle Fitments

• Yamaha WR 400 1998–2000

• Yamaha WR 426 2001–2002

• Yamaha YZ 400 1998–1999

• Yamaha YZ 426 2000–2002