Farm Equipment - WD-45 carb issues

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WD-45 carb issues

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=31206
Printed Date: 09 Mar 2025 at 3:42pm
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Topic: WD-45 carb issues

Posted By: Andy NW Iowa
Subject: WD-45 carb issues
Date Posted: 23 May 2011 at 11:09am

My WD-45 runs lean, even after warming up. I put a new carb kit in, I put in new Champion sparkplugs. I found out it didn't have a thermostat in it, so I put one in, helped a little. I found out someone had the plug wires switched around, helped quite a bit. After all this it runs pretty good, but if you put any load on it sputters before it takes off, and If I try to adust the bottom adjusting needle it does nothing. I can have it all the way in or out and I seems to run the same. If I put a little choke on it runs great. Also the tractor was stuck when I got it, although not very. Any Ideas?

Replies:

Posted By: Matt MN
Date Posted: 23 May 2011 at 11:39am

Sounds like some of the "passages" inside of the carb are plugged.

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Unless your are the lead horse the scenery never changes!!

Posted By: JayIN
Date Posted: 23 May 2011 at 12:00pm

Yeah, I bet that the passages are plugged up with specks of rust. My 45 had exactly the same symptoms a month ago when I was plowing the garden. Cleaned it out and it was ok. Acted just like yours. Unscrew the fuel line at the carb and make sure you have good fuel flow, too.

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sometimes I walk out to my shop and look around and think "Who's the idiot that owns this place?"

Posted By: Dave Richards (WV)
Date Posted: 23 May 2011 at 1:36pm

Andy, Dont know which carb you have. Before you disassemble it again, take the bottom needle all the way out and look inside with a light to see it there is a jet you may have missed.

Posted By: KC-WD45
Date Posted: 23 May 2011 at 1:50pm

vacuum leak probably on the manifold. Sounds like you are sucking air. Check around the intake runners at the head.

Posted By: Dick L
Date Posted: 23 May 2011 at 1:59pm

Sometimes when cleaning a carburetor the area behind the main jet which leads to the feeder tube in the throat gets missed. To clean that area you must remove the main jet and the feeder tube and spin with your fingers a small drill bit to scrape the crud out. A dental pick will work also. I don't have one but I think they make a small spiral brush thing that will fit in the hole.

Another problem that sometimes happens when people are repairing carburetors using more than one to make one is to use a non adjustable main jet with a adjustment needle instead of a plug. Any time the needle gets close to the jet it restricts it. The main jet could also be a size smaller than needed. I have pictures of an MS carb where the non adjustable bottom was fitted with an adjustable top. A person not knowing the difference can do the switch very easy. I found several Zenith non adjustable main jet carburetors for the Allis B's and C's that had the needle in where it should have had a plug also. Most of those run fine if the needed is not turned in.

Posted By: Brian G. NY
Date Posted: 23 May 2011 at 4:51pm

That tube on the main jet is VERY critical. you must remove it and clean ALL the tiny little holes. I use tip cleaners and tiny drill bits but fine piano wire or wire from a wire brush should also do the trick. Use lots of carb cleaner in the process.

These old carbs are pretty simple........but when rebuilding them...."cleanliness is next to Godliness"!