Replace your Yamaha carburetor's air cut-off valve with the OEM-style K&S Technologies 56-1018 set for reliable performance. Located on the side of the carburetor, this valve prevents lean fuel mixtures that can cause backfire during deceleration. It temporarily closes the pilot jet airway, enriching the fuel mixture when the throttle is released, ensuring smooth operation. This set includes a diaphragm, spring, and O-ring, making installation straightforward and reliable. Crafted for durability, the components are designed to match the original specifications, ensuring perfect fit and function. Whether restoring a vintage Yamaha or maintaining a recreational vehicle, this set provides a direct replacement to keep your engine running smoothly and efficiently. The K&S Technologies air cut-off valve set is ideal for riders seeking quality OEM parts to maintain peak performance. Features: OEM-style replacement set for Yamaha carburetors Includes diaphragm, spring, and O-ring for complete installation Prevents lean fuel mixture and engine backfire during deceleration Located on the side of the carburetor for easy access Durable components designed for long-lasting performance