Farm Equipment - B/C magneto and tuneup

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B/C magneto and tuneup

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=132822
Printed Date: 07 Jun 2025 at 4:10am
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Topic: B/C magneto and tuneup

Posted By: BrianC
Subject: B/C magneto and tuneup
Date Posted: 19 Dec 2016 at 3:16pm

I am giving the tractors some TLC. Would like confirmation of my assumptions with the spark timing. It has the magneto.

My C flywheel has a F mark on it. I can't find a C mark.
If I am running 1200 rpm, using a timing light, the F mark should light up centered
in the timing hole?
Is this F mark at 30 degrees BTDC?
The magneto has no varying advance, F is centered same at 600 rpm or 1200. Correct?
The magneto's impluse coupling retards the spark by 30 degrees when hand cranking?
That means the start spark happens at about TDC?

Thank you

Replies:

Posted By: rpropst
Date Posted: 19 Dec 2016 at 5:17pm

You are correct .

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1950 snap coupler B 1948 WD 1951Ca 1952B 1952adjustable axel B