Farm Equipment - Rough running B

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Rough running B

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=137286
Printed Date: 08 Nov 2025 at 3:37pm
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com

Topic: Rough running B

Posted By: Brighton boy
Subject: Rough running B
Date Posted: 11 Apr 2017 at 7:09pm

I have 1938 B that is a hand crank in good condition and recently I have been having troubles with it running. It starts ok but when it gets hot it doesnt want to stay running. Anybody have an idea on where I should start to look?

Replies:

Posted By: RLBPA1
Date Posted: 11 Apr 2017 at 7:15pm

Running good cold but not hot is a sign of a coil problem in your magneto. If it's not been changed from the original coil I would start looking there. A bad coil will also make it difficult to start when hot.

Posted By: Bill Long
Date Posted: 11 Apr 2017 at 9:48pm

You may get lucky and get it running right by replacing the condenser.

Take good care of my favorite

Good Luck!

Bill Long

Posted By: LeonR2013
Date Posted: 12 Apr 2017 at 7:35am

If those suggestions don't work you might check the valve adjustment.

Posted By: JimD
Date Posted: 12 Apr 2017 at 9:21am

I would start with valves. No cost fix.

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