I did some more tested today as Joe suggested.
With the mag plate and flywheel on the power head,
I used a buzz box to mark where the points start to
open. I rotated the mag plate so the "Start" arrow
on the gas tank would be where the points start to open.
The "Start" arrow is also the reference I used in marking
the flywheel for when the pistons were at TDC.
I then hooked one lead of my OHM meter to the spark plug
wire for the Top cylinder, and the other lead to ground.
At about 340 degrees the Ohm meter would start reading
the coil secondary reading of 6.38, ( I presume this is
where one of the carbon brushed made contact to ground) and would maintain
that reading until about 70 degrees, and then drop to "Zero" Ohms.
As I kept rotating the flywheel, it would maintain "Zero"
ohms until about 160 degrees, and the the meter would
go "Whacky", with high readings all over the place,
and stay whacky until about 250 degrees and drop back
out to Zero ohms.
I then switched my meter to the bottom cylinder plug
wire. It pretty much duplicated the same scenario,
except that when the points opened at TDC the
secondary readings were very irratic. Instead of the
fairly steady 6.38 reading on the top cylinder, the
bottom cylinder would read .310 one second, 17.60, 7.36, etc.
The reading would drop to Zero (as the top cylinder) at
around 70 degrees.
I’m not sure what any of this testing is telling me 🙁
On both cylinders, I had the "Whacky" high readings
between 160 to 250 degrees.
WHY?
Why the whacky, readings on the bottom cylinder test
when the points opened?
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Prepare to be boarded!