Idle System

The carburetor has an idle system in the primary stage to supply the correct air/fuel mixture to the engine during idle on and off operation. Fuel flows from the float bowl through the main fuel jet to the fuel well through the lean orifice and past the solenoid controlled fuel orifice. The fuel is picked up in the well by the idle tube and is metered at the lower tip of the submerged idle tube, and passes up through the tube where it joins with air in the idle down channel.

Air enters the down channel by 3 routes; through the upper fixed idle air bleed (rich authority), through the lower fixed idle air bleed, and through a cross channel, past the solenoid controller air bleed.

The air/fuel mixture moves down to the adjustable idle mixture screw discharge hole where it enters the carburetor bore and blends with the air passing the slightly open throttle valve.