AIR SCREW 10-80573M

Function and technical context

The air screw is a precision component built into the air intake system of Mercury and Yamaha outboard engines. Its function is to regulate and control the flow of air entering the carburetor or combustion system, guaranteeing the correct air-fuel mixture necessary for optimal engine operation. Located in the intake line, this screw is critical to maintaining idle stability, throttle response and overall marine propulsion performance. Failure or wear in this component can cause inadequate mixtures, revolution fluctuations and loss of navigation efficiency.

When to replace this part?

The air screw requires inspection during each seasonal maintenance, especially if the engine presents symptoms such as unstable idle, difficulty starting, engine flooding or irregular variations in revolutions during navigation. Although it does not have a fixed replacement interval like other consumable components, mechanical wear, marine corrosion or the accumulation of debris in the air circuit can compromise its factory adjustment. Preventive replacement of this screw during a complete carburetor overhaul prevents costly repairs and ensures reliable cruising in any conditions.

Compatible Mercury Mariner Engines

Equivalent manufacturer part numbers