The only adjustment that can be made on this carburetor is float level setting. It is important that this be doen accurately since the proper functioning of the high-speed circuit depends to a large extent upon the maintaining of the correct fuel level.
Invert the air horn and hold it level so that only the weight of the float is on the needle. The distance from the lowest point on the seam of the float to the machined surface of the bowl cover should be one-quarter inch as measured with float level guage. Adjust level by bending lip of float. Do not bend the float.