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.

Re: Need Help Identifying This Carburetor
 

Farmer fix?

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..

Re: Need Help Identifying This Carburetor
 

Simple answer, it's an old, dirty carb!

Re: Need Help Identifying This Carburetor
 

It does look to have adjustable main jet

Re: Need Help Identifying This Carburetor
 

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.

Re: Need Help Identifying This Carburetor
 

Yes,

Adjustable main jet.

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

Chris W.

Re: Need Help Identifying This Carburetor
 

I have seen a couple of stock Model A Zeniths that had an aftermarket adjustable jet installed.

Re: Need Help Identifying This Carburetor
 

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.

Re: Need Help Identifying This Carburetor
 

Could be a racing accessory carb. Stamped zenith to comply with rules.
A tractor carburetor is more likely.

Re: Need Help Identifying This Carburetor
 

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

Re: Need Help Identifying This Carburetor
 

They are staggered. Thanks everyone for all your help.

Re: Need Help Identifying This Carburetor
 

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.

Re: Need Help Identifying This Carburetor
 

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