VALVE EXHAUST YZF400 426 98-02, KIBBLEWHITE 80-8057H
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
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CNC machined from a one-piece forging of EV8 Stainless Steel
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High resistance to heat and corrosion
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Hard chrome finish applied with a 360-degree anode for uniform coating
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Designed using Finite Element Analysis (FEA)
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Flow-optimised profiles tested on a computerised flow bench
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Recommended for use with Kibblewhite valve spring kits (Part No. 65-724)
Specifications
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Head Diameter: 28.00mm / 1.102"
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Stem Diameter: 5.00mm / 0.1955"
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Tulip Angle: 25 degrees
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Overall Length (OL): 81.85mm / 3.220"
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Standard size
Cross-Reference OEM Part Numbers
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Kibblewhite Part No. 80-8057H
Vehicle Fitments
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Yamaha WR 400 1998–2000
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Yamaha WR 426 2001–2002
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Yamaha YZ 400 1998–1999
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Yamaha YZ 426 2000–2002