Seller notes

K & S Carburetor Air Cut-Off Valve Sets XL250S XL500S XR250 XR250R XR500 Direct OEM-style replacement air cut-off valve set. Kit includes diaphragm, spring and o-ring. Located on the side of the carburetor, the air cut-off valve prevents lean fuel mixture (backfire) when decelerating. Temporarily closes the pilot jet airway to provide a richer mix as the throttle closes. Sold in sets for one carburetor. Fits the following models: HONDA XL250S 1978-1979 HONDA XL500S 1979-1981 HONDA XR250 1980 HON...

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