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Old 11-21-2019, 06:14 PM   #24
scicala
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Join Date: Jun 2010
Location: Detroit suburb, MI
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Default Re: Float gauge for Holly 1901 carb

"Sal,

I am assuming that the idle tubes and the well tubes (attached picture top left and right) are one size only for this carburetor, since they are not marked with a size.

Should the main jets and the power valve (attached picture - lower) all be the same size? I note that I am currently running 54 main jets yet the power valve is a 52.

I note that there were carbs for the Canadian market. The "M" carb I would guess was to show it was for the Mercury in 52'-53'."


Roy, I'm not sure if the main well tubes or idle jet tubes (with threads on them) are all the same size, but the manual calls for #54 idle tubes. Don't think that means .054". The well tubes are actually air bleeds for the main system.
Main jets are not always the same size, but your carb for sea level originally came with #56 main jets, so you may have to go smaller than #54's.
The power valve (#52) has two .037" side holes.
The "M" at the end of the carb part number isn't for Mercury. It's just the latest alphabetical rotation of revisions for the carb. (Before it, was the "L").


Sal
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