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Old 03-16-2021, 06:48 AM   #1
Dave1931Pickup
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Default Need Help Identifying This Carburetor

What model of Zenith is this? What is the thing protruding down from where the Main Jet would be installed? It has a knurled end on it which appears to be removable as a separate item from the thing hanging down which also appears to be removable. Looking down the throat the Main Jet and the Cap Jet are visible.
Thanks for the help.
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Old 03-16-2021, 08:18 AM   #2
1crosscut
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Default Re: Need Help Identifying This Carburetor

Farmer fix?
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Old 03-16-2021, 08:25 AM   #3
Jack Shaft
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Default Re: Need Help Identifying This Carburetor

No GAV...I'd guess its for a constant speed governed industrial engine. Zenith's multiple jet design became obsolete rather quickly, emulsion tube carburetors ( marvel schebler style) were cheaper to build and performed better..
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Old 03-16-2021, 11:21 AM   #4
Jim Brierley
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Default Re: Need Help Identifying This Carburetor

Simple answer, it's an old, dirty carb!
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Old 03-16-2021, 12:15 PM   #5
Kurt in NJ
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Default Re: Need Help Identifying This Carburetor

It does look to have adjustable main jet
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Old 03-16-2021, 12:28 PM   #6
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Default Re: Need Help Identifying This Carburetor

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I would rule out combine. The ones I have seen had an air balance tube on one side so oil bath filter could be used.
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Old 03-16-2021, 10:21 PM   #7
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Default Re: Need Help Identifying This Carburetor

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Originally Posted by Kurt in NJ View Post
It does look to have adjustable main jet
Yes,

Adjustable main jet.

I have seen this before but not for a very many years.

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Old 03-17-2021, 12:20 AM   #8
redmodelt
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Default Re: Need Help Identifying This Carburetor

I have seen a couple of stock Model A Zeniths that had an aftermarket adjustable jet installed.
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Old 03-17-2021, 11:53 AM   #9
DHZIEMAN
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Default Re: Need Help Identifying This Carburetor

Quote:
Originally Posted by Dave1931Pickup View Post
What model of Zenith is this? What is the thing protruding down from where the Main Jet would be installed? It has a knurled end on it which appears to be removable as a separate item from the thing hanging down which also appears to be removable. Looking down the throat the Main Jet and the Cap Jet are visible.
Thanks for the help.
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Originally Posted by redmodelt View Post
I have seen a couple of stock Model A Zeniths that had an aftermarket adjustable jet installed.
Looked around on ebay, and I may have gotten close but no model on the carb but rather what one that resembles your pictures. The one I found was off a COE GMC 248! Not sure if the helps or more confusion.
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Old 03-18-2021, 05:35 AM   #10
Wick
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Default Re: Need Help Identifying This Carburetor

Could be a racing accessory carb. Stamped zenith to comply with rules.
A tractor carburetor is more likely.
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Old 03-18-2021, 07:28 AM   #11
Benson
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Default Re: Need Help Identifying This Carburetor

Quote:
Originally Posted by Dave1931Pickup View Post
What model of Zenith is this? What is the thing protruding down from where the Main Jet would be installed? It has a knurled end on it which appears to be removable as a separate item from the thing hanging down which also appears to be removable. Looking down the throat the Main Jet and the Cap Jet are visible.
Thanks for the help.

When you look down into throat are the main and cap jet staggered or are they lined up with each other?

Last edited by Benson; 03-18-2021 at 02:50 PM.
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Old 03-18-2021, 09:19 PM   #12
Dave1931Pickup
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Default Re: Need Help Identifying This Carburetor

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When you look down into throat are the main and cap jet staggered or are they lined up with each other?
They are staggered. Thanks everyone for all your help.
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Old 03-18-2021, 11:35 PM   #13
Benson
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Default Re: Need Help Identifying This Carburetor

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Originally Posted by Dave1931Pickup View Post
They are staggered. Thanks everyone for all your help.
OK thanks.

At first I thought the carb might be a very early prototype 27 but it does not have the bosses for double venturi pin or pins and you confirmed it does have the staggered Cap and Main jets of the single venturi versions which happened after the Stromberg law suit.

Very strange that GAV is missing though.
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Old 03-19-2021, 12:36 AM   #14
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Default Re: Need Help Identifying This Carburetor

Maybe not if it ran at a set speed on a stationary engine.
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