How Long do you normal need choke?
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Category: Allis Chalmers
Forum Name: Farm Equipment
Forum Description: everything about Allis-Chalmers farm equipment
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=43284
Printed Date: 17 Sep 2025 at 10:08pm
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Topic: How Long do you normal need choke?
Posted By: Turbo_760
Subject: How Long do you normal need choke?
Date Posted: 05 Jan 2012 at 6:53pm
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Workin on the 1950 CA that I picked, new igntion system and carb just got reassembled after 3 day carb cleaner bath.... Its about 20F out and I start the CA, fires right up and runs at 3/4 choke. I take it out and joyride it in the snow and have to continue to use 3/4 choke.
I have run it for about 30 mins and the coolant temp is just between the freezing mark and 120, feels about right to the touch. So I need to get a new thermostat it would seem.
So my question is how long do you normally have to run choke?
Just to start it? or until you get it up to operating temperature?
Just trying to know if I am still chasing a carb problem... ------------- 1951 CA Cub Cadet 149 |
Replies:
Posted By: Gary in da UP
Date Posted: 05 Jan 2012 at 6:56pm
| Just to start, you have a restricted fuel flow at some point. |
Posted By: Ryan Renko
Date Posted: 05 Jan 2012 at 7:21pm
| I use the choke just to start our 1950 wd. You cant push it back in fast enough once she starts though!!! Ryan |
Posted By: Stan IL&TN
Date Posted: 05 Jan 2012 at 7:30pm
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If you need choke to keep it running after 30 seconds I'd say you still have a problem. Mine is like Ryan's and you can't hardly push it in fast enough. ------------- 1957 WD45 dad's first AC 1968 one-seventy 1956 F40 Ferguson |
Posted By: Dakota Dave
Date Posted: 05 Jan 2012 at 7:46pm
| choke to start and 1/2 to 3/4 for about a minute when its cold out. no choke at all if it above 40 deg F. all four tractors are about the same. |
Posted By: Steve in NJ
Date Posted: 05 Jan 2012 at 8:15pm
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Like any other engine, the Allis engines aren't any different. In cold weather under 40 degrees, most engines need a fatter fuel mix in order to run. The choke takes care of that blocking off the cold dense air to allow a little more richer mix till the engine builds cylinder head temperature. AC engines (especially the 125's) do run cool as a cucumber even in the summer. If you have shutters on the front of the radiator, shut em'. This allows the engine to warm up a little faster in that cold chilly air. I would think after running for 5 minutes or so in say 25 degree weather, you should be able to open the choke just about all the way. Again, it greatly depends on the engine and how the engine reacts. All engines react differently than one another. You can get 40 different answers here about the same engine on how one's choke should work. My B in the winter acts differently than the IB's engine. My B, I leave the choke in the 3/4 position till I hear the engine start to just stumble a little, then I open the choke up slow and listen for the engine rpm's to climb slightly and the engine smooth out. I let the engine build cylinder head temp for about 5 minutes before I put her to work. The IB needs very little choke in the winter air. That little bugger wings right over and just runs nice. Go figure. I try not to be out much in the cold weather anyway. I'm gettin' to old for that kinda stuff and the heaters on my B & IB don't work worth a crap.... LOL! Steve@B&B |
Posted By: Dakota Dave
Date Posted: 05 Jan 2012 at 8:56pm
I don't know where you are but after I moved here to North Dakota I found that I had to put a winter front on the tractors or they wounld never warm up. when it was -20F without protection I needed choke or they would not run right. A simple tarp wrapped all the way around with holes for the lights moffler and intake works the best just bunge together at the bottom. the First one I did I forgot to cut a gas cap hole untill I ranout at the end of the road. ofcourse it was -20 that day. you can see on this picture what it looks like.
 |
Posted By: bluebanshee
Date Posted: 05 Jan 2012 at 9:01pm
| Our B has always started without choke in all weather, even single digits. Seems it can sit for weeks and start on the first revolution. |
Posted By: Ryan Renko
Date Posted: 05 Jan 2012 at 9:12pm
| Our WD also!! It starts on the first revolution also and shut the choke off as fast as you can. Just kinda wondering, will these computer controlled monster tractors of today start like that when they are 62 years old?? LOL!! Ryan |
Posted By: Dusty MI
Date Posted: 05 Jan 2012 at 9:21pm
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Turn the high speed jet screw out 1/4 to 1/2 turn. Dusty ------------- 917 H, '48 G, '65 D-10 series III "Allis Express" |
Posted By: Chalmersbob
Date Posted: 05 Jan 2012 at 9:57pm
| It doesn't have a "high speed jet" if it has a OEM carb on it. Bob |
Posted By: Dusty MI
Date Posted: 06 Jan 2012 at 6:06am
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Then it has a non-adjustable high speed jet, and it's partly plugged, or has been changed to a smaller one. Dusty ------------- 917 H, '48 G, '65 D-10 series III "Allis Express" |
Posted By: Turbo_760
Date Posted: 06 Jan 2012 at 7:18am
This is a M\S carb that has no adjustability other than idle A/F. I have been struggling with this carb since I have got this tractor.
I can firm it is not fuel supply issue as it has all new line to the carb ( someone removed the screen on the inlet to the carb). behaves the same if I run it from the fuel tank or my tempory fuel tank that I have been running.
The main jet is clear as I have visually checked it a few times. How can I confirm that I have the correct JET?
I have read that I should check the bowl vent to make sure that isn't plugged. Where is the bowl vent on this Carb
------------- 1951 CA Cub Cadet 149 |
Dusty MI wrote:Posted By: jaybmiller
Date Posted: 06 Jan 2012 at 8:12am
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until she's says 'yes, you can buy another tractor' ????
------------- 3 D-14s,A-C forklift, B-112 Kubota BX23S lil' TOOT( The Other Orange Tractor) Never burn your bridges, unless you can walk on water |
Posted By: RMD
Date Posted: 06 Jan 2012 at 8:54am
| My experience is with CAs and D12s - in the winter they usually need the choke for 5 or 10 minutes after starting to keep running. CAs in particular tend to run cool - it's hard to get them up to operating temperature unless you are working them very hard. |
Posted By: Chalmersbob
Date Posted: 06 Jan 2012 at 10:22pm
| I have 2 CA's, 1 will start without using the choke and the other one I have to use the choke for the first 2-3 minutes. Bob |
Posted By: ironac
Date Posted: 07 Jan 2012 at 2:41am
| Just spray the crap out of it with either! Just kidding don't do that |
Posted By: Dusty MI
Date Posted: 07 Jan 2012 at 7:55am
Sorry I didn't know that carb didn't have an adjustable jet. I was hoping someone that knew that carb better would answer. With that said, maybe it's the wrong jet, or maybe the wrong carb. If you have a local AGCO dealer you could go there. Most dealers are great and will work with you. Or try Sandy Lake. They are on here often, and help support this site. parts@sandylakeimp.com or 888-252-0656 Good Luck, Dusty ------------- 917 H, '48 G, '65 D-10 series III "Allis Express" |
Posted By: Gerald J.
Date Posted: 07 Jan 2012 at 9:40am
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When the carburetor doesn't have an adjustable high speed jet you can adjust the power mix by changing the gasoline level in the float bowl. Higher level means richer running. Even when the carburetor has an adjustable high speed jet, if the level in the float bowl is way off the transition from idle to run can be poor. You can also check float level by taking out the drain plug, then screw in a pipe thread (I presume 1/8") to hose and slip on a few inches of clear plastic hose bending it into a U with the top of the above the top of t he carburetor. It will show you the float level while running. If you don't have any restrictions in the fuel supply the level should hold constant while running. Check that carburetor inlet adapter screen for varnish! Gerald J. |
Posted By: ALinIL
Date Posted: 07 Jan 2012 at 1:17pm
| My 2cents - I have a CA and agree with all. They are cold blooded. In the winter you need to hold the choke on for almost 5 mins. In the summer on a cold start, you need to hold it on for a minute or so. The fixed hi speed jet is part of the problem. I have replaced the fixed jet with an adjustable after-market unit and found it to make the tractor run much better and help with the choking issue. |