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Zenith carb issue

IH CUB Lo-Boy Series - 154, 184, 185 Forum -- Questions and answers to all of your Lo-Boy related issues.
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Mcald62
Posts: 13
Joined: Fri Jul 09, 2021 7:48 am
Zip Code: 06468
Tractors Owned: 1955 Farmall Cub
1975 Cub Lo-boy 185
1947 Huber Maintainer
1962 Schramm 125 Pneumatractor
Circle of Safety: Y

Zenith carb issue

Postby Mcald62 » Thu Nov 23, 2023 3:34 pm

I recently bought a 1975 Lo Boy 185. It runs great with the choke completely closed and stalls when I open it fully. I’ve gone through the carb twice now and cleaned everything thoroughly. I’ve rebuilt a number of Zeniths and never had a problem. The fuel tank is like new and the sediment bowl and fuel line are spotless. The only thing I have not done is check the float level clearance. I also have not replaced either the intake or bowl gaskets as they appear to be intact. Any ideas as to why it wont run properly ? Should I buy a rebuild kit and go through it again?
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Don McCombs
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Tractors Owned: "1950 Something" Farmall Cub
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1977 International Cub w/FH
1978 International Cub
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Location: MD, Deep Creek Lake

Re: Zenith carb issue

Postby Don McCombs » Thu Nov 23, 2023 3:36 pm

Have you checked the filter screen in the carburetor fuel intake? It’s part of the brass fitting.
Don McCombs
MD, Deep Creek Lake

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The best teachers are those who show you where to look, but don't tell you what to see.
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Mcald62
Posts: 13
Joined: Fri Jul 09, 2021 7:48 am
Zip Code: 06468
Tractors Owned: 1955 Farmall Cub
1975 Cub Lo-boy 185
1947 Huber Maintainer
1962 Schramm 125 Pneumatractor
Circle of Safety: Y

Re: Zenith carb issue

Postby Mcald62 » Thu Nov 23, 2023 5:03 pm

Yes. It’s like new.
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ricky racer
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Re: Zenith carb issue

Postby ricky racer » Thu Nov 23, 2023 6:34 pm

What you're describing is a blockage in a carburetor jet or passage. You'll need to disassemble the carb again and determine where the blockage or partial blockage is.
1929 Farmall Regular
1935 John Deere B
1937 John Deere A
1941 John Deere H
1952 John Deere B
1953 Farmall Cub
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Mcald62
Posts: 13
Joined: Fri Jul 09, 2021 7:48 am
Zip Code: 06468
Tractors Owned: 1955 Farmall Cub
1975 Cub Lo-boy 185
1947 Huber Maintainer
1962 Schramm 125 Pneumatractor
Circle of Safety: Y

Re: Zenith carb issue

Postby Mcald62 » Thu Nov 23, 2023 7:20 pm

I guess if I have to take it apart for a third time I will buy a rebuild kit.
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tst
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Re: Zenith carb issue

Postby tst » Thu Nov 23, 2023 9:04 pm

did you pull the main jet out on the bottom of the bowl, make sure passages in body are clean ?
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Mcald62
Posts: 13
Joined: Fri Jul 09, 2021 7:48 am
Zip Code: 06468
Tractors Owned: 1955 Farmall Cub
1975 Cub Lo-boy 185
1947 Huber Maintainer
1962 Schramm 125 Pneumatractor
Circle of Safety: Y

Re: Zenith carb issue

Postby Mcald62 » Thu Nov 23, 2023 9:27 pm

Yes I did clean the main jet
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Dale Finch
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Re: Zenith carb issue

Postby Dale Finch » Thu Nov 23, 2023 9:54 pm

Do you have an online filter installed? If yes, is it for gravity flow (no fuel pump)? Is it installed the correct direction?
Dale Finch
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Don McCombs
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Zip Code: 21550
Tractors Owned: "1950 Something" Farmall Cub
1957 Farmall Cub w/FH
1977 International Cub w/FH
1978 International Cub
1948 Farmall Super A
Circle of Safety: Y
Location: MD, Deep Creek Lake

Re: Zenith carb issue

Postby Don McCombs » Thu Nov 23, 2023 10:51 pm

For Zenith parts and kits, contact McDonald Carb & Ignition.
Don McCombs
MD, Deep Creek Lake

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Proud Member of Maryland Chapter 39

The best teachers are those who show you where to look, but don't tell you what to see.
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staninlowerAL
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Re: Zenith carb issue

Postby staninlowerAL » Fri Nov 24, 2023 4:20 am

Visually Check the choke butterfly to see if it is in the position that you think it is. Maybe it is operating backwards i.e. you think it's open and it is actually closed. JMHO Stan
Stan in LA (lower AL)
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Mcald62
Posts: 13
Joined: Fri Jul 09, 2021 7:48 am
Zip Code: 06468
Tractors Owned: 1955 Farmall Cub
1975 Cub Lo-boy 185
1947 Huber Maintainer
1962 Schramm 125 Pneumatractor
Circle of Safety: Y

Re: Zenith carb issue

Postby Mcald62 » Fri Nov 24, 2023 8:03 am

No filter and the choke is operating properly.
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Gary Dotson
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Re: Zenith carb issue

Postby Gary Dotson » Fri Nov 24, 2023 8:25 am

It sounds like you still have a blockage somewhere in the main metering circuit. I agree with Don, contact Morgan at McDonald Carb and Ignition. Not only will he have the parts you need, he’s very knowledgeable on Zenith carbs.
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Mcald62
Posts: 13
Joined: Fri Jul 09, 2021 7:48 am
Zip Code: 06468
Tractors Owned: 1955 Farmall Cub
1975 Cub Lo-boy 185
1947 Huber Maintainer
1962 Schramm 125 Pneumatractor
Circle of Safety: Y

Re: Zenith carb issue

Postby Mcald62 » Fri Nov 24, 2023 8:48 am

Thanks, I will do that.
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SONNY
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Re: Zenith carb issue

Postby SONNY » Wed Dec 06, 2023 11:11 am

internal passages blocked and no way to clean them. had some here the same way. IF anybody knows how,---speak up!!! Only have 2 cubs left here now and the main one messed up so I put a chimineese knockoff on it 2 years ago and still runnin. was plowing with it til the ground got muddy! The other one has sat for 6 years with the grader blade under it and I lost interest in it.
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