GENERAL AVIATION AIRCRAFT FLY AT altitudes from sea level up to many thousands of feet. In order to maintain a combustible fuel mixture, each carburetor must have a way of maintaining the proper fuel to air ratio throughout a wide range of altitudes and atmospheric pressures. A proper mixture of fuel and air at sea level, for example, would be too rich at 7,000 feet. The mixture control on the carburetor allows the pilot to control the amount of fuel that is exiting the carburetor and entering the engine intake system. Pulling the mixture control aft in the cockpit leans the mixture while pushing the control forward enriches the mixture.The mixture control cable is connected to a lever on the carburetor. The lever pivots between two stops that control the range of motion as the mixture control cable is pushed in or pulled out. If the mixture control is pulled fully aft, the lever contacts the idle cutoff stop. If the mixture control is pushed fully in, the lever contacts the full rich stop. The lever is designed to contact the full rich stop on the carburetor a tiny bit before the mixture control knob in the cockpit is pushed fully in.
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