Turning this screw in a clockwise direction creates a richer mixture while turning it counterclockwise creates a leaner mixture. Once again, the lower the number of the Needle Jet, the leaner the mixture.
Smaller numbers indicate decreasing jet opening and leaner conditions.
Float guide pins should be polished to insure smooth float action. Floats with aluminum guides should be replaced. Float arm should start out parallel to the float chamber base. Fuel pump must be in system to insure correct fuel level. How to Check the Float Level Start and warm up engine.