Idle system
1 – channel for taking fuel from the float chamber; 2 – idle fuel jet; 3 – idle air jet; 4 – bypass channel; 5 – output channel
When the engine is idling, 70% of the fuel mixture is supplied through the idle system and 30% through the main metering system.
Fuel is drawn in through the main fuel passage, passes through the idle jet and then mixes with the air flow entering through the air duct in the main jet housing.
The working mixture then flows through the internal channels of the carburetor to the adjusting screw, which regulates the fuel supply at idle. Next, this mixture mixes with air from the idle bypass channel and, finally, through the outlet channel enters the intake manifold at an increased speed.