Direct OEM-style replacement carburetor air cut off valve.
Located on the side of the carburetor the air cut off valve prevents lean fuel mixture (backfire) when decelerating. 
Includes:
- Diaphragm
 - Spring
 - Sold in sets for one carburetor
 
Honda XL250S 1978-1979
Honda CB400 1978
Honda CB400T 1978-1979
Honda CM400A 1979
Honda CM400T 1979
Honda CX500 1978-1979
Honda CX500C 1979
Honda CX500D 1979