[AJD] magneto question

[Louis]

Kyle,

Your method of testing is fine.  Just make sure to have about an 1/8" gap
for the spark to jump.

I would start by taking some 600 grit sandpaper or an emery nail file and
lightly clean up the contacts of the points.  Sometimes the contacts get
oxidation on them and will cause the mag to not fire.  I have seen that
happen to mags within a year of being rebuilt.

Lou 

-----Original Message-----
From: antique-johndeere-bounces at lists.antique-tractor.com
[mailto:antique-johndeere-bounces at lists.antique-tractor.com] On Behalf Of
Kyle Sands
Sent: Sunday, June 18, 2006 12:29 AM
To: Antique John Deere mailing list
Subject: [AJD] magneto question


Hello folks - I have what may be a pretty basic magneto question.  I've got
a '38 JD B with a Wico C mag.  It's a project tractor that I got running
several years ago, but since then, it has been sitting undisturbed but out
in the elements - though I have kept the magneto covered and protected.  I
decided to start doing some more work on the tractor recently and found that
it does not spark anymore.  

To get it running back then, I had purchased a rebuilt magneto which of
course worked just fine then.  It has less than an hour's worth of run-time
on it, so is essentially still brand new.  I pulled the cap and everything
looks clean as a whistle, no burn marks, no pitting, no corrosion, nothing
that would indicate an obvious problem.  I'm wondering what sorts of issues
can arise from non-use that would cause a brand new mag to quit working?  (I
do know the problem has to be in the mag and not in the plug wires or plugs
because I swapped out those items from my running Model AW and didn't get
any spark either.)

Also, to test the mag when it is not installed on the tractor, is it ok to
just ground a wire to the mag body and flip the impulse over by hand?  Or is
that not going to work or is it inadvisable?

Thanks!

Kyle Sands <><Alexandria, MN 

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