The Story
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
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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
Details & Craftsmanship
Every detail has been carefully considered to bring you the perfect product.
Description
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
