Moving back to the top of the carb main body, the accelerator pump discharge nozzles are removed with a Phillips. The nozzles should be the same size for the primary and secondary circuits; ours were the factory-installed 28s. Hiding underneath each nozzle is a little needle that can be shaken out by flipping the body over, but be careful. Lose one of these and you are dead in the water until you can get a new one or find the one you lost. The needle prevents fuel from being sucked out of the nozzle when air passes by the venturi.