Be sure to adjust each in direct relation to the other as you proceed if you have more than one idle screw (most two and four-barrel carburetors do). 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. You’re working around moving parts and strong chemicals.The flame and pressure created can cause severe injury. As the engine runs, it can backfire, sending a fireball through the carb.
Some parts of the engine can get hot enough to cause second or third-degree burns. However, there’s always the risk of coming in contact with it and injuring yourself.
For the most part, you will be working away from the fan. Keep your fingers clear of the engine fan.Even a tiny backfire is enough to cause a fire with gas on the manifold-ask me how I know. If you detect one, make sure to deal with it appropriately before proceeding. Carburetors are on older vehicles, and there’s always a chance that there’s a fuel leak.
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