Brand New 2FastMoto Yamaha Carburetor Air Cut-Off Valve Kit. The air cut-off valve helps to eliminate backfiring on hard deceleration (throttle fully closed) in constant velocity carburetors. Hard deceleration creates a high vacuum signal in the intake tract which activates the valve. Kit replaces 3 Components (diaphragm, 2 springs) in Yamaha OEM Number 3CF-1490H-00.
Replaces K&L Number: 28-1819
Note: Not for use on 1988 XV750 California Model!