Begin by adjusting the idle mixture screws by 1/8 turn increments in or out. You may need to perform this during warm up if the idle speed is too high after reverting to “factory” spec. Be sure to adjust it so that you start with the engine’s normal running speed. If you set a baseline in step 4, chances are idle is a little high. So, be sure to let the engine run and reach normal operating temperatures before proceeding. The engine's running temperature directly correlates with proper air and fuel mixtures. You can do so by adjusting the idle mixture screws to 1.5-2 turns out, and the idle speed screw to 1-1.5 turns in. If the carburetor is new or has been rebuilt, you should set it to "factory" adjustment. If you are using a vacuum gauge for this process, you should find and connect it to a manifold vacuum port before starting the engine. Before beginning, you should familiarize yourself with the location of the idle mixture and idle speed screws. The air cleaner and filter assembly must be removed for you to access the carburetor. It is wise to wear a set of safety glasses and protective gloves to keep your skin and eyes intact as you work.
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