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Allis CA carb or choke problem??

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Jeff Rose

06-16-2002 20:20:47

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HELP!!!!! I just picked up my first Allis at an auction. It is a CA (1952), with a woods belly mower. I cut grass with it a few times , then this week when I went to cut, it would only run with "choke" on about half way...even after several minutes of warming up. We rebuilt the zenith 11141 carb with a kit from NAPA. but still the same problem. Next we emptied the gas tank and added new gas and some carb cleaner.We also blew the gas lines out a few times, but still the same problem. The tractor starts quick, and has tons of compression...so I can't believe it is anything major. We even had the "air mixture needle valve" all the way out..and it still ran with choke on half way. I was thinking maybe it was sucking air around the intake manifold..but I hope I am wrong and you guys know of something "different" about these tractors. Any help you can offer will be appreciated..and thank you in advance. By the way..I noticed parts are tougher to find for these tractors than my Ford 8n. Any leads there too?? Thanks Jeff Rose

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06-17-2002 19:23:08

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 Re: Allis CA carb or choke problem?? in reply to Jeff Rose, 06-16-2002 20:20:47  
check the sediment bowl for trash.
run the needle valve all the way in and then back it out about 1-1/2- 2 turnsstart it on choke and slowly take choke off. then you might want to put a higher octane fuel in it or a gasoline additive. if yo uhave to use starting fluid you have a problem. wd-40 works well if you have any more questions call me 937-884-7280

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06-17-2002 06:41:47

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 Re: Allis CA carb or choke problem?? in reply to Jeff Rose, 06-16-2002 20:20:47  
Hey that's exactly the same tractor and mower that I bought last year too. I'd open the petcock or plug on the bottom of the carb and gas should run freely out. if it does run good, then i'd guess maybe a vacuum leak at the carb base gasket, intake gasket, maybe a hole in the intake manifold from rust. another possibility...did you blow through or run a small wire through the main jet passage? it might be partically clogged. my carb is a zenith...it has a mixture screw at the top near the bolt flange. that is the idle mixture. mine is set at about 1 turn out. mine does not have a high speed mixture screw...i wish it did. some zenith's were factory set so it's real important that the jet inside the plug at the bottom of the bowl is cleaned out because you can't compensate for it. also, seems like the float is set till it's about level when the top body is inverted. if need be, i can let you know what the float setting needs to be. just let me know. hope this helps, Kent

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06-16-2002 21:49:03

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 Re: Allis CA carb or choke problem?? in reply to Jeff Rose, 06-16-2002 20:20:47  


1. Make sure its getting enough gas from the tank. Open the drain on bottom of the carb, it should run a reasonable stream.

2. If you don't get a good flow at the carb, the sedament bowl is probably plugged. Check the glass to see if there is water in the bowl. If there is water in the bowl, the screen at the outlet won't let water through and you need to remove the bowl and dump the water. If there isn't any signs of water, remove the glass sedament bowl ( you probably will need a new gasket ). Gas should run out with a good flow. If not, then inlet to the sedament bolw is plugged ( rust or straw or whatever ). Some bowls have a screen at the inlet, some do not ( I don't remember what AC has ). probably have to remove the bowl to check inlet if it seems plugged. If the bowl has a good stream when the glass is removed, the screen for the sedament bowl outlet is plugged. This screen is above the cork gasket for the glass bowl. To check this, it is necessary to remove the screen as the screen is a very tight mesh and you really need to remove it to see if its plugged. The brass screens corrode and get gooed up to where they don't let gas flow out. If the screen is a cloth type, replace it with a brass one as the cloth ones are way to fine and cause endless grief particulary if there is any moisture in the system.

3. Another place to look is at the carb gasket. It has ( or should have ) a hole in it to allow the passage that vents the float chamber to outside air to remain open. If this passage is blocked the float chamber is at the same vaccum as the intake manifold so not enough gas comes out of the main jet. We did this once when my dad made a home made gasket. It ran exactly as you describe. Also took a while to figure it out.

My opinion only, Take care and enjoy the CA

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06-17-2002 05:53:13

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 Re: Re: Allis CA carb or choke problem?? in reply to DPOST, 06-16-2002 21:49:03  
I had the same problem with my WD45, I tapped the carberator "lightly" with a hammer, loosened the debri, plugging up the fuel flow....an easy fix that worked for me.

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