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I have just done a total carb soak/cleaning and blown out all passageways with compressed air on my carburetors. Well I thought I blew them all out. Until I came across this photo that shows a tiny passageway that I didn't pay any attention to because I didn't notice it. What is this?

Carb-02.jpg
 

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on some carburetors, that tiny hole is called a 'progression hole', which adds fuel just off idle, it helps to smooth the transition between idle and partially open throttle, as the slide or butteryfly opens.
 
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