Seller notes

Kibblewhite Exhaust Valve Guide #80-80230 Yamaha WR450F/YZ450F Product Details C630 nickel bronze is used as the material to make these valve guides because of its ideal characteristics for the application The 4-5 percent nickel content provides superior resistance to wear and the approximately 80 percent copper content delivers outstanding heat conductivity Guide profiles are designed to have minimal effect on the airstream while maintaining critical cross sectional thickness in high temperatur...

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