Quote:
Originally Posted by rudvirus
would the idea screw be the top one?
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The idle speed set screw would be the screw that is on the side and sets against the throttle lever to set the opening.
The idle mixture screw would be the uppermost screw at an angle of about 45* and controls the air to gas mixture.
I had the Zenith original carb in mind. I see 1955cj5 has given you the right answer below.