Farm Equipment - Wc magneto - fires on all ports

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Wc magneto - fires on all ports

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=195378
Printed Date: 24 Aug 2025 at 4:29pm
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com

Topic: Wc magneto - fires on all ports

Posted By: kevin LA-CA
Subject: Wc magneto - fires on all ports
Date Posted: 25 May 2023 at 10:17pm

Last fall the wc wouldnt start. No spark. Took off the magneto cleaned up the points and got spark. Doing some testing found it was sparking on all ports no matter where the rotor was.

Tried cleaning up cap and rotor, but no change.

Conventional FBM of the 1940s - not sure the full number. Any suggestion? Or just a new cap?

Replies:

Posted By: Les Kerf
Date Posted: 26 May 2023 at 11:28am

There has to be some serious carbon tracking inside the cap to enable the current to flow to all 'ports' at once.

I would replace both cap and rotor.