wd run rough under load
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=20243
Printed Date: 08 Feb 2025 at 10:57pm
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Topic: wd run rough under load
Posted By: briangroc
Subject: wd run rough under load
Date Posted: 02 Nov 2010 at 12:08pm
searched the forum, not much help
49 wd with a mag, new plugs gapped .030, new wires, cleaned out the carb.
Starts rite up, but doesnt "purr" like it was
when the tractor is under load (brushhog) it can barely get out of its own way.
tractor is popping(not backfiring) not a crisp engine sound
almost sounds like its not running all 4 cylinders. stuck valve ?but im not sure how to tell
guys have any suggestions
tractor was running fine 2 weeks ago
Thanks Brian
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Replies:
Posted By: Bob D. (La)
Date Posted: 02 Nov 2010 at 12:28pm
When you replaced the plug wires did you use "wire core" plug wires. A mag will not run correctlyon carbon core wires.
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When you find yourself in a hole,PUT DOWN THE SHOVEL!!!
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Posted By: Brian Jasper co. Ia
Date Posted: 02 Nov 2010 at 12:32pm
I'd have to look to be sure, but I think maybe the plug gap for a mag is .025. Did you put new points and condenser in? Don't get cheap ones. Borg Warner or Standard Blue Streak are the brands you want. The stuff at TSC for tune up are not what I would use. When it comes to wires, you need to use solid wire core type. The automotive suppresion type don't work well with a mag. Does it help to pull the choke out a bit? If so, you may have a carb adjustment/clogging problem. Old fuel can loose it's potency and not run well.
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"Any man who thinks he can be happy and prosperous by letting the government take care of him better take a closer look at the American Indian." Henry Ford
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Posted By: mlpankey
Date Posted: 02 Nov 2010 at 12:35pm
gap is to wide for mag . may not have the load jet set correctly also. if i had a picture of a couple of the plugs it would be a help. spark plugs are the window to the combustion chamber.
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people if they don't already know it you can't tell them. quote yogi berra
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Posted By: briangroc
Date Posted: 02 Nov 2010 at 12:59pm
i did not use " wire core" wires, i will get them. i was a cheapo
plugs have a white/gray color to them when pulled
when i turn in the idle adjusting screw on the carb nothing happens.
at some point it should shut off fuel to the tractor rite?
I did not realize a mag has points and a condensor. I will get and replace. is it easy to replace?
guys thanks for your time Brian
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