Quadboss 420585 Air Cut-Off Valve Rebuild Kit Carburetor Needle and Seat

The Quadboss 420585 Air Cut-Off Valve Kit provides a complete solution for rebuilding the air cut-off valve circuit in your ATV or UTV carburetor. This essential maintenance kit addresses common carburetor issues that can significantly impact engine performance and driveability.

Key Features:

• Complete rebuild kit includes O-rings, diaphragm, spring, and screws necessary to restore proper air cut-off valve function
• Eliminates poor running conditions and backfiring caused by malfunctioning air cut-off valves
• Prevents sticking valves that can remain open or closed during operation
• For vehicles with multiple carburetors, kit includes components to repair all carburetor units
• Precision-manufactured components ensure proper fit and reliable performance

When air cut-off valves stick open or closed, they create poor running conditions and cause popping or backfiring during deceleration. This rebuild kit restores the proper operation of this critical emission control component, ensuring smooth engine performance and proper fuel mixture control throughout the RPM range.