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On a carb that has a fuel screw yes, but this is an air screw. In most carbs, if the screw is in the front of the carb and underneath, it will be a fuel screw. If it is at the back of the carb near the carb intake, it will be an air screw (i.e., it controls the amount of air allowed into the mixture, at least in a "fine-tuning" sense).
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