If you consider the idle speed too high, check whether the idle speed screw is touching the stop when you set the speed control to minimum, with the engine running. Remember, the specified idle speed for Briggs engines like yours is normally 1,750 rpm, and the maximum allowable speed is 3,500 rpm for your engine (enforced by the governor, to keep from breaking the aluminium connecting rod). If your idle speed is less than half of your maximum speed, you will arouse the ire of Briggs and Stratton, because there will not be enough cooling air passing through the cylinder head fins. After considering that, if your idle speed is too high, you adjust it by turning the idle speed screw anticlockwise with the speed control set at minimum.
