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How to Adjust the Idle of a Carburettor

Model: (Various brands) Various
Part: Carburetor

Video tutorial

In this video, learn how to adjust the idle of a carburettor. To do this, increase the airflow using a tapered needle.

To prevent a lean mixture from causing engine seizure, chamfer the throttle plate slightly. A small chamfer will help maintain a sufficiently rich idle to avoid seizure.

Additionally, if the needle has a greater taper at the tip, it will allow for increased fuel flow, while you can adjust the airflow by reducing it; remember that you cannot completely close it.


Updated on 11 August 2026 by ScegliAuto


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