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Stopper - idle in SUs

SteveInOakland
in Carburetor Central

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The parts catalog refers to this item as "Stopper - idle." Can anyone explain what this part does? Mine have gotten totally loose. Maybe it's sometimes referred to by another name? Two visuals attached.

Thanks hugely in advance.

post-9012-14150819992402_thumb.jpg

post-9012-14150819992553_thumb.jpg

Just a way of securing your A/F knob from getting any more rich. It stops the A/F knob from dropping down any further. Most carb sets have them removed, that I have seen.

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