As the throttle is opened and the idle system becomes less effective, the main discharge nozzle (15) starts to deliver fuel. This occures at approximately 900 RPM road load. Between 900 and 1200 RPM, there is a definite blending of the idle and main metering system. In the above range, all the fuel passes through the main jet (13) up through the main well (6) to angle channel (9). here the fuel is atomized by the high speed bleed (7), and an additional supply of air is introduced to this mixture by the bleeder plug (16) before being discharged through the vertical passage (14) into the venturi.

The float bowl (12), is vented to the atmosphere through a balance tube (34). This system, besides correcting float chamber air pressure for atmospheric changes, keeps dirt out of the fuel system and redcues air cleaner clogging effects to a minimum.