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Old 04-30-2021, 10:56 AM   #1
dlfrisch
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Default Carburater

Took my Tollison carb. off - could’t (adjust) it to make the engine run right. One of my A friends said, use a Zenith it’s a better carb. So, I bought a used Zenith on eBay. Wow, good deal $89.00 dollars. The It was a ##$&@* mess. Cleaned it, then proceeded to disassemble it for soaking and then the air compressor and then rebuild time. It must have been put together by a gorilla- I broke the idle needle valve off, so I had to carefully drill it out and use a come-along to get the rest of the tiny nipple out. I sent to Mikes Ford a Bull for a rebuild kit. It came with the three needle valves, but the replacement idle valve (the one I broke) is longer. It installs OK, but it is longer in length. It goes up into the venteare. Has anyone experienced this situation? I have not installed this rebuilt carburater yet. It’s ready to be installed, but I have been temporarily layer-up.
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Old 04-30-2021, 11:06 AM   #2
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Pm sent.
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Old 04-30-2021, 03:53 PM   #3
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I am running a Zenith that I recently rebuilt, and am happy with it. I also have a Tillitson, and bought a rebuild kit for it incase I need a back-up.
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Old 04-30-2021, 05:54 PM   #4
dlfrisch
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Jvee34! Did you rebuild the Zenith ? If so, did it replace the idle jet with one that is longer in length?
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Old 04-30-2021, 05:55 PM   #5
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Jvee34, Did you rebuild the Zenith ? If so, did it replace the idle jet with one that is longer in length?
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Old 04-30-2021, 08:51 PM   #6
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The longer idle Jet is only for the EARLY 1928 Double Venturi carburetors ( the ones without the brass secondary well insert in the lower casting).

If longer idle jet is used in newer carbs with the brass secondary well, the longer idle jet will be bent when you tighten up the bolt!

Last edited by Benson; 05-01-2021 at 11:12 AM.
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Old 05-01-2021, 07:29 AM   #7
dlfrisch
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Default Re: Carburater

Benson, what is the lower brass extension? The idle jet, that I ordered was 9/32 “ to fit the place where the old one was (the one, that I role off). It is longer in length and it fits up into the venturi. I may install the carb. today.....I have been out of commission- hurt my leg.
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Old 05-01-2021, 10:45 AM   #8
Benson
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Quote:
Originally Posted by dlfrisch View Post
Benson, what is the lower brass extension? The idle jet, that I ordered was 9/32 “ to fit the place where the old one was (the one, that I role off). It is longer in length and it fits up into the venturi. I may install the carb. today.....I have been out of commission- hurt my leg.

The brass extension is called the secondary well.


It sounds like there might be a misunderstanding on the name of the parts.

Also sounds like maybe some previous owner installed parts in the wrong locations.

1. The idle jet is next to the venturi (but the long end of jet) does not go into the venturi it goes into the secondary well.


2. The idle jet screws into upper casting and the longer end goes into the brass secondary well located in the lower casting.

Please scroll through all of this page and look at all of the photos and descriptions of the parts.

http://model-a.org/components_full.html

Last edited by Benson; 05-02-2021 at 10:16 AM.
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Old 05-01-2021, 08:03 PM   #9
dlfrisch
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Thanks Benson, I’ll study the carb. sheets you sent to me.
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Old 05-02-2021, 05:34 PM   #10
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Modelabasics.com great info on carb
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Old 05-02-2021, 07:42 PM   #11
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Originally Posted by dlfrisch View Post
Jvee34, Did you rebuild the Zenith ? If so, did it replace the idle jet with one that is longer in length?
I did rebuild it, and it had the same length as was in it.
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