How Carburetor Works - Main Fuel System

CARBURETOR MAIN FUEL SYSTEM

With the throttle plate fully open, the carburetor main fuel system takes effect. The small amount of air is supplied through the air jet position on the outer face of the carburetor. This air travels through the horizontal passage that turns downwards through the inclined passage to the emulsion tube chamber where it mixes with the fuel drawn through the main fuel jet. The mixture of fuel and air enters the carburetor Venturi through the top of the emulsion tube and here it mixes with the additional, main quantity of incoming air. Because of the tapering constriction in the middle of the Venturi, air flow increased velocity causes low pressure that draws the fuel through the main jet and emulsion tube upwards.
For a small engine, the main system air fuel mixture is still rich.

[alanfreeman]

Very good maybe a note of gas left in the carb over time ==Gum I am 90 and have just found out the hard way, excellent video.

[teddlovell]

the throttle plate should rotate the other directions, away from the idle mixture port and past the progression holes

[SunilSundar]

Great video. But the throttle plate is turning in the wrong direction

[cleancarburetor]

Visit us at
www.cleancarburetor.com

It might be a surprise, but that little carburetor is rather complex device. It consist of 4 different systems:
1. Fuel delivery
2. Idle and transition system
3. Main fuel system

To understand how the carb works as a whole system, watch all CleanCarburetor movies:

[PVTKunalmuk]

Really everything went through your imagination ..

[vishvajitverma]

एनिमेटेड सिरीज़ अच्छी है किसी इंजिन की कार्यप्रणाली समझने के लिए पर ये बहुत अच्छी हो सकती है अगर हिंदी में हो

[alext]

I think you need just a touch more echo and if the music was just a little louder it would be perfectly impossible to understand the nice robotic voice. Geeze.