Carburetor Explained!
2-Stroke Carburetor | 'HOW IT WORKS' - Dirt Bike ATV/Strimmer/Hedge Trimmer/Brush Cutter
A two-stroke carburetor with a throttle barrel system in a string trimmer (or similar small engines) plays a crucial role in regulating the air-fuel mixture that the engine needs for efficient combustion and operation. Here's how it works:
Throttle Barrel: The throttle barrel is a cylindrical component located within the carburetor. It's connected to the throttle trigger or lever on the handle of the string trimmer. When you squeeze the trigger or move the lever, it adjusts the position of the throttle barrel.
Airflow Control: The throttle barrel is positioned in the carburetor's venturi, which is a narrowed section in the air intake path. When you operate the throttle trigger, it moves the throttle barrel, changing the size of the venturi. This action controls the amount of air entering the carburetor and, subsequently, the engine.
Fuel Delivery: As air flows through the venturi, it creates a low-pressure area. This vacuum effect draws fuel from the carburetor's fuel reservoir (often located within the carburetor or connected to it) through small fuel passages. The rate of fuel flow is influenced by the size of the venturi and, therefore, the position of the throttle barrel.
Air-Fuel Mixture: The carburetor is calibrated to deliver the correct air-fuel mixture for different engine operating conditions. The throttle barrel, by adjusting the airflow, controls the ratio of air to fuel. When you open the throttle, more air is allowed into the engine, leading to a leaner mixture. Conversely, closing the throttle restricts airflow, creating a richer mixture.
Idle Adjustment: The carburetor may have an idle speed screw that can be used to adjust the engine's idle speed. This screw controls the position of the throttle barrel when the engine is idling. A correctly adjusted idle ensures that the engine runs smoothly when not under load.
For some FREE Printable Download help Leaflets: www.therepairs...
This is quite different indeed to the more common type of two stroke carburettor.
I hope you find it useful
Many thanks indeed
Craig Kirkman
All images, video and audio content on this video was created and owned by Craig Kirkman (Owner and Creator of The Repair Specialist Channel).
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