Re: 1940 Johnson HD-15 Magneto testing

[Buccaneer]

Joe, thanks again for your thoughts.
I seen that other thread and glad to
see I’m not the only one ever having
troubles with this type of mag!

When I was grounding out the spark plugs
(in the video) I didn’t get the reaction one
normally would, but if I remember correctly,
the reaction seemed "more normal" when
shorting out one cylinder than the other.

I’m not sure "how" or "if" the Stevens ST-75
could be used to Hi-Pot the bakelite
plate in the flywheel. I’d really be bummed out
if I fried my new found Stevens 😮
Anyone have thoughts on if it’s "doable?"

Joe, regarding the timing light, that’s an interesting idea.
Being that there’s only one set of points, I would think
theoretically, the timing between cylinders would
be automatically synced?
I guess I could use my "buzz box" on the points (if I can snake
a wire up through the bottom of the mag plate) and mark
a spot on the flywheel for the top cylinder where the
buzz box sounds off (points open), then do the same
for the bottom cylinder, as you say, using different color
markers.
If the plugs are indeed firing between "top dead center" of
the piston strokes, the timing light should be flashing
in places other than "on" the colored marks, and I might
break out in a disco dance?
Is this the general idea?
I think my old Sears timing light still works….. guess it’s
worth a try if I can get the HD-15 started again!
Thanks for the ideas!

Prepare to be boarded!