1948 cub carb question

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hotrodcars
Posts: 37
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Tractors Owned: 1948 F CUB
Location: Springfield,VA

1948 cub carb question

Postby hotrodcars » Fri Mar 25, 2022 7:41 pm

Hey folks I'm coming to the end of my restoration and I think this thing has the wrong carb on it, the inlet of the carb is bigger than the breather tube hence the hose does not fit plus the mounting flange is larger than the flange on the manifold, it still mates up with the gasket and the manifold but it doesn't quite look right. The carb I have is a zenith 13794e, can someone tell me what the original brand is supposed to be? I have attatched a pic of the carb as well as an updated pic of my cub. Thank you in advance for any help you could provide !!!
Attachments
IMG_3958 (1).jpg
IMG_3959 (1).jpg

staninlowerAL
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Re: 1948 cub carb question

Postby staninlowerAL » Fri Mar 25, 2022 8:34 pm

Early cubs came with an IH carb and changed to Zenith in the mid 60's I believe. Someone will probably post the exact year/SN. Zenith works OK might have to add extra gaskets for the butterfly to clear the intake manifold. If you want an IH carb, check with the forum sponsors at the bottom of this page.
Stan in LA (lower AL)
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Bob McCarty
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Re: 1948 cub carb question

Postby Bob McCarty » Fri Mar 25, 2022 9:53 pm

The Zenith takes a rubber air hose that flares larger to go over the larger inlet on the carb.
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Don McCombs
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Re: 1948 cub carb question

Postby Don McCombs » Fri Mar 25, 2022 10:00 pm

The changeover to the Zenith occurred in 1975. The carb for a 1948 should look like this...

Image
Photo courtesy of TM Tractor Parts.
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Dale Finch
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Re: 1948 cub carb question

Postby Dale Finch » Fri Mar 25, 2022 10:06 pm

As mentioned, the IH carb uses the metal tube from the air cleaner with two short hoses. The Zenith carb uses this hose, available from TM Tractors:
c5073s.jpg

http://www.tmtractor.com/new/ae/4537fp.htm
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Re: 1948 cub carb question

Postby SamsFarm » Fri Mar 25, 2022 10:14 pm

Bob McCarty wrote:The Zenith takes a rubber air hose that flares larger to go over the larger inlet on the carb.


I have saw people buy and use a rubber fernco adapter from the plumbing supply places to adapt the zenith to the preexisting metal tube!

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Glen
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Re: 1948 cub carb question

Postby Glen » Fri Mar 25, 2022 10:45 pm

Hi,
Cubs came with the IH, 3/4" updraft carburetor, until mid 1975, then IH started using the Zenith carb. The Zenith is a 1" updraft carb they have said on here.

The IH carb is shown in the 1947, and 1949 Cub owner's manuals.
IH didn't make a new manual every year, they have said on here, there wasn't a 1948 owner's manual, I guess. They have the 1947 and 1949 manuals on here, if you want to see them.

Below is a pic from TM Tractor of an IH style carb on a Cub engine. It looks like a newer, replacement carb.
TM Tractor is at bottom of the page, and has a new replacement IH style carb.
You would need a gas line that fits it, TM Tractor has the metal gas line also. :)
Attachments
Cub carb 3.jpg

hotrodcars
Posts: 37
Joined: Sun Apr 18, 2021 4:08 pm
Zip Code: 22152
Tractors Owned: 1948 F CUB
Location: Springfield,VA

Re: 1948 cub carb question

Postby hotrodcars » Wed Mar 30, 2022 9:41 am

Hey folks thanks again for the info. now to buy a new carb !!!!

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Don McCombs
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Tractors Owned: "1950 Something" Farmall Cub
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1948 Farmall Super A
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Location: MD, Deep Creek Lake

Re: 1948 cub carb question

Postby Don McCombs » Wed Mar 30, 2022 11:34 am

Let us know which IH style carb you intend to buy. There are some things you need to know about the eBay Chinese carbs.
Don McCombs
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John *.?-!.* cub owner
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Re: 1948 cub carb question

Postby John *.?-!.* cub owner » Wed Mar 30, 2022 2:37 pm

Before you buy a different carb think it over. If you are just wanting one to have the original style carb on it get whatever appears to be right, but all 3 of my cubs (47,48,49) have Zenith carbs on them, which obviously are replacements. One had an Ih, which I traded for a Zenith so all 3 would be the same. The Zeniths are physically sturdier than the IH carbs, but the IH carbs do start quicker which the extra round or two to start only matters if you are hand cranking. An IH carb being warped or the fuel line threads being stripped is not unusual due to the design. I have worked on a lot of cubs, both mine and friends, and the only warped Zenith carb I have ever seen that was warped was on a cub I bought and still own some 35 years later. It belonged to an old man with Alzheimer's, and had a bowl full of water. Whether he had done it due to mental problems or someone else did it as a prank I do not know, but even in northern ARK. it gets cold enough to freeze that small amount of water in the winter time. I spent about 3 hours sliding that bowl on a large sheet of emery cloth laying on a piece of smooth Masonite. :tractor:
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