Farm Equipment - B carb problem

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B carb problem

Printed From: Unofficial Allis
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=203549
Printed Date: 22 Nov 2024 at 10:11pm
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com

Topic: B carb problem

Posted By: john64
Subject: B carb problem
Date Posted: 07 Oct 2024 at 2:00pm

I planed to take my B to a show a few weeks ago. I always drain as much gas as possible and run it until the gas is burned out of the carb. When I tried to start it, it would fire for about 2 seconds and die. I pulled the carb and blew out the passages, didn't see any junk in it. Put it back on, same thing. I am running just purchased, no alcohol gas.

Do any of you have an idea of what could be the problem? TIA

Btw, I'm also JohnCo, I keep having to change my name to get on.

Replies:

Posted By: PaulB
Date Posted: 07 Oct 2024 at 5:57pm

Not actually being able to see what's happing first hand, I'll tell you that often what you think is a fuel issue turns out to be an ignition issue and what you think is an ignition problem turns out to be fuel related.

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If it was fun to pull in LOW gear, I could have a John Deere.
Real pullers don't have speed limits.
If you can't make it GO... make it SHINY

Posted By: steve(ill)
Date Posted: 07 Oct 2024 at 7:35pm

is there a drain plug on the carb ? Open it and see that you have flow.. If the BOWL is full, the engine should run close to a minute before running out of gas ... If a jet is plugged, you might have to move the CHOKE... but it still should run for a short period of time..

as Paul said, you could be looking at a bad coil / etc.

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Like them all, but love the "B"s.

Posted By: john64
Date Posted: 07 Oct 2024 at 8:47pm

I get a steady flow from the drain plug so I assume the float valve is working properly. I have never had a coil go out on a mag like this, usually they work or not. For the two seconds it runs, it sounds strong. Once I try it and it runs, it won't start for maybe 10 minutes, again running for 2 seconds. Oh yeah, it runs on either for as long as I squirt it into the intake, so I guess that rules out the coil. A mystery for sure!

Posted By: WF owner
Date Posted: 07 Oct 2024 at 9:03pm

If you remove the air filter hose and keep spraying small amounts of starting fluid in the carburetor and you can keep it running, you can decide if it's a fuel or spark problem. From what you are saying, I am betting it's a fuel delivery or carburetor problem.

Posted By: steve(ill)
Date Posted: 07 Oct 2024 at 10:21pm

yep... you ruled out the SPARK !... Bowl is full, but will not run... but you can run on ether... Sounds like your main jet is plugged ! ... Time for a carburetor CLEANING.

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Like them all, but love the "B"s.

Posted By: john64
Date Posted: 11 Oct 2024 at 12:44am

Well, it runs, don't really know what it was. I put another carb on and more non corn squeezens gas and it started. Probably enough bad gas to cause the problem. Anyway, thanks for the suggestions!