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How to Clean the Carburettor and Adjust the Engine Idle

Model: Fiat 500 Epoca - Years 1957-1975
Part: Carburetor

Good maintenance is essential for an efficient vehicle and to ensure its longevity. In this guide, we will see how to clean an old carburettor and make the necessary adjustments if it has just been replaced.
First, to clean the carburettor, it must be removed. Once free, clean it thoroughly with a specific product or acetone, or you can soak it in petrol or diesel and then brush it carefully.
Once cleaned and reassembled, and importantly, having replaced the gaskets, turn it upside down with the float facing up and check that it is 7 mm away from the gasket.
If you have just replaced the carburettor, you need to make the correct adjustments before starting the engine. First, loosen the mixture adjustment screw almost completely, count the total turns it takes to close fully, and then unscrew it by an amount equal to half of those turns. Greater precision can be achieved once the engine is running.
With the idle screw tightened beyond halfway, start the engine and adjust it, noting that it is advisable to make the adjustment when the engine is warm.

Updated on 1 February 2026 by ScegliAuto

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