Identification of my Engine and Carb - in order to get a new Carb

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JKaechler
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Identification of my Engine and Carb - in order to get a new Carb

Postby JKaechler » Tue Dec 07, 2021 9:25 pm

I am ressurecting a 1975 International Cub. Serial number 248587. The Tractor sat unattended for some years, and while we have now fixed up the electrical system and gotten fire to the spark plugs, we now have to move to the carburetor.

So, in trying to ID the carb, we cant find any numbers stamped into it. Its a Zenith. and it looks mostly like the pics we can find on the web of various other ones. But I suspect that the previous owner may have swapped in some other carb than the stock model.

The serial number we find on the engine right beneath the hydraulic lines is: 60ct2u3178x

The Tractor is the 'longstripe' model, it was yellow and the remains of the stripe were on the hood until i sanded and primed it last weekend.

We could use any input the group can offer on getting a compatible carb on here, hopefully for not a whole lot of $$. We are not trying to do a factory restore, rather we want to put it to work doing some mowing and dragging and such. :help:

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Re: Identification of my Engine and Carb - in order to get a new Carb

Postby Eugene » Tue Dec 07, 2021 9:50 pm

Couple close up photos of your carburetor.

Edit. Could the engine be out of a numbered Cub?
Last edited by Eugene on Tue Dec 07, 2021 10:22 pm, edited 1 time in total.
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Re: Identification of my Engine and Carb - in order to get a new Carb

Postby Dale Finch » Tue Dec 07, 2021 9:59 pm

If you post a photo of the carb, we can probably identify it. They are not very complicated, and most times can be repaired...often it only needs a thorough cleaning.

Do you know what is wrong with your carb, in other words, what is it doing or not doing?
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Re: Identification of my Engine and Carb - in order to get a new Carb

Postby Glen » Tue Dec 07, 2021 11:45 pm

Hi,
The Longstripe Cubs came with a Zenith carburetor.
There is originally a tag with ID on the carb, evidently the tag is gone on yours.

There are a few pics of the carb in the operator's manual I posted for you in October.
Page 1, and page 33 have pics, they are not real clear, but visible.

Below is a listing at TM Tractor for a new Zenith, it looks about the same as the original. You can look at the pics and see if it looks the same as yours.

http://www.tmtractor.com/new/fl/2376fp.htm

TM Tractor has some parts for them, it doesn't say they need any ID numbers.
The Zenith parts are in the 6th row.

http://www.tmtractor.com/new/fl/fl_001newparts.htm

Many times the carb just needs cleaning, and the float level set right.
They can have plugged passages inside them.
The main jet can be plugged, then the engine doesn't get gas, or if it's partly plugged, not enough gas.
If the engine doesn't run right, and you think it's the carb causing it, I would take the carb apart and clean it, and set the float level.

Clean the outside of the carb with solvent before taking it apart, to keep dirt out of the carb.
Clean inside the carb with carb cleaner, or soak it if you have equipment for that.
Blow out all the passages with compressed air. Wear your safety goggles when using the air.

Below is a page from the Cub service manual, it shows setting the Zenith float level in the lower pic on the page.

http://www.farmallcub.info/manuals/gss- ... 002-09.jpg

Below are pages from the Cub parts manual showing the Zenith carb.
It says they were used on engines serial number 312390 and above.

The main jet is under the cover, number 18 in the pic, which is at the lower rear of the carb.
The main jet is number 20 in the pic.
The jet screws out, if you need to remove it. They have said on here to use a screwdriver that fits the slot well, and don't let it slip. Grind a screwdriver to fit well in the slot if needed.

http://www.farmallcub.info/manuals/cub_ ... 012-14.jpg

http://www.farmallcub.info/manuals/cub_ ... 012-15.jpg

There is originally a screen in the 90 degree gas line fitting at the carb, I think they have said remove the fitting to clean the screen.

The gas strainer under the gas tank needs to be cleaned, and kept clean. It has a screen in the top, above the bowl gasket.
If the hood is on the Cub, move the Touch Control arms to the rear, or down position before taking the strainer apart. It is easier to get to the strainer. But you need to run the engine to do that.
If the gasket is old, it may not seal if you reuse it.
TM Tractor at the bottom of the page has a new gasket and screen.

Below is a page from the operator's manual showing the strainer. On the page before this one, it said clean it every 250 hours of use. :)

http://farmallcub.com/rudi_cub/www.clea ... age-34.jpg

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Re: Identification of my Engine and Carb - in order to get a new Carb

Postby ricky racer » Wed Dec 08, 2021 6:39 am

A carburetor doesn't wear out so I'm not sure why it would need replacement. As Dale said, with a thorough cleaning and adjusting the float level the old carb should preform as well as a new one.
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Re: Identification of my Engine and Carb - in order to get a new Carb

Postby Gary Dotson » Wed Dec 08, 2021 8:30 am

As far as I know, all the later, Zenith equipped Cubs, had the same model Carb. There were likely generational changes / upgrades, that would be reflected in the tag #. That Zenith model even became the IH replacement for early Cubs. As others have mentioned, unless there is something very serious wrong with your existing carb, it can be saved.

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Re: Identification of my Engine and Carb - in order to get a new Carb

Postby Matt Kirsch » Wed Dec 08, 2021 9:49 am

There were a few different part numbers but the carbs were for all intents and purposes the same, and use the same rebuild kit.

You should be able to even use one of those cheap original Cub carb clones that are like $30.

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Re: Identification of my Engine and Carb - in order to get a new Carb

Postby JKaechler » Wed Dec 08, 2021 10:05 am

I will try to get some pics. we have the carb soaking in a bucket of cleaner right now. A rebuild kit would be great if you can help identify which one to get. I know the gaskets on it are toast. and there is an issue that one of the little springs leapt off into the great unknown when we dismantled it! :D I am really hoping that a rebuild kit would include that teeny little spring.

the problem it was having was that it flooded the carb, and fuel came running out the air intake end of it.

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Re: Identification of my Engine and Carb - in order to get a new Carb

Postby Don McCombs » Wed Dec 08, 2021 10:33 am

Call Morgan at McDonald Carb & Ignition. If you need a kit, or just parts, he can help you figure out what you need. 706-367-4179
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Re: Identification of my Engine and Carb - in order to get a new Carb

Postby Bill Hudson » Wed Dec 08, 2021 2:52 pm

Don McCombs wrote:Call Morgan at McDonald Carb & Ignition. If you need a kit, or just parts, he can help you figure out what you need. 706-367-4179


You betcha!

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Re: Identification of my Engine and Carb - in order to get a new Carb

Postby inairam » Thu Dec 09, 2021 7:16 am

Zeniths are very hard to identify without the tag. Your late 1975 probably had a Zenith from the factory. The family of zeniths for the cubs are series 63. They change that identification for the family somewhere along the line but I have done searches for" series 63 zeniths carb" and found kits.

https://burchstoretractors.com/products ... y-tractors
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Re: Identification of my Engine and Carb - in order to get a new Carb

Postby Pap » Thu Dec 09, 2021 8:13 am

Hey I'm a little late but Welcome to the forum JK.

Good luck with your project and Enjoy Your Ride.
Are We Having Fun Yet ? :D
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Re: Identification of my Engine and Carb - in order to get a new Carb

Postby Gary Dotson » Thu Dec 09, 2021 8:23 am

Call Morgan, as Don suggested, tell him the year of your Cub and that it has a Zenith. He’ll know what you need, he’s very helpful and knowledgeable. Also, if the little spring is not included, tell him and he can fix you up.

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Re: Identification of my Engine and Carb - in order to get a new Carb

Postby JKaechler » Thu Dec 09, 2021 11:30 am

here are the numbers from the tag

8 11 01
18794E
71523093

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Don McCombs
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Re: Identification of my Engine and Carb - in order to get a new Carb

Postby Don McCombs » Thu Dec 09, 2021 11:42 am

You sure it doesn't say 13794? The 2001 date would imply that it is a replacement carburetor.
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