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Tuning Your Carburetor5 Stages of an Amal Concentric Carburetor
A warped float bowl gasket surface can prevent the idle gas circuit from working properly. Any air leak at this joint can break the vacuum that draws the
pilot carburetor fuel from the bowl.
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Maintainence: The major problem that plagues any carburetor today, whether it is your motorcycle or lawn mower, is evaporation of fuel in the float bowl.
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Just because you can spray brake clean, or the like, through the pilot jet passage does not mean the bike will idle, or make a smooth transition as the bike accelerates. The
pilot jet is a fixed size orifice and the size, and the amount of fuel it passes, is critical to how the
pilot carburetor operates. One should also concern themselves with the two idle circuit transfer holes either side of the back edge of the slide. They too must be clear of hardened fuel residue and on size.’
(www.tioc.org/amalbritbike.pdf )
