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Zenith carb issue
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- 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
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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- Team Cub Mentor
- Posts: 17508
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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
Have you checked the filter screen in the carburetor fuel intake? It’s part of the brass fitting.
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- 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
Yes. It’s like new.
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- 10+ Years
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- Joined: Wed Sep 12, 2007 8:40 pm
- Zip Code: 49120
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- Location: Niles / Buchanan, Michigan
Re: Zenith carb issue
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
1935 John Deere B
1937 John Deere A
1941 John Deere H
1952 John Deere B
1953 Farmall Cub
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- 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
I guess if I have to take it apart for a third time I will buy a rebuild kit.
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- 10+ Years
- Posts: 5228
- Joined: Tue Jan 12, 2010 2:08 pm
- Zip Code: 12514
- Circle of Safety: Y
Re: Zenith carb issue
did you pull the main jet out on the bottom of the bowl, make sure passages in body are clean ?
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- 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
Yes I did clean the main jet
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'56 Cub #194370 "Boris" with Mott Flail mower - Circle of Safety: Y
- Location: NC, Chapel Hill
Re: Zenith carb issue
Do you have an online filter installed? If yes, is it for gravity flow (no fuel pump)? Is it installed the correct direction?
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- Team Cub Mentor
- Posts: 17508
- Joined: Mon Feb 03, 2003 6:45 am
- 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
For Zenith parts and kits, contact McDonald Carb & Ignition.
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- 10+ Years
- Posts: 5004
- Joined: Fri Oct 29, 2010 11:34 pm
- Zip Code: 36558
- Tractors Owned: Cubs: (3)'49's, (1 is for parts), (1)'57 IH Cub LoBoy w/FH, (2)154 Number Series Loboys, (1 is for parts), '76 Longstripe w/FH, Mowers: C-22, Bush Hog 412, Pennington 59, Woods RM42CF, Woods 42, assorted FCub plows, planters, discs, etc. OTHERS: '49 AC B & Ind. Sickle mower, '61 AC D12 Ser 2, '52 8N, '56 Ferguson 35 Deluxe, '47 & '49 Avery V, '53 MM BG (offset), '51 JD M (regular), '56 JD 420C, with Blade and fire plow, '85 JD 850 (Yanmar) w/72" belly mower, '76? Yanmar 2TR15 1500 & Bush Hog SQ42S-2 mower, '78? FORD Dexta, '86 FORD LGT14D & 48" Mower, (2)Cub Cadets & Mowers (MTD), (4) Sears Surburban's, other MTD mowers, Jeeps & other misc. "treasures"
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Re: Zenith carb issue
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)
USAF & Reserves, Reg ARMY, ARMY NG (AL)
USAF & Reserves, Reg ARMY, ARMY NG (AL)
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- 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
No filter and the choke is operating properly.
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Re: Zenith carb issue
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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- 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
Thanks, I will do that.
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- 10+ Years
- Posts: 4119
- Joined: Thu Nov 09, 2006 11:26 pm
- Zip Code: 61722
Re: Zenith carb issue
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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