If I remember correctly, this coil with the carbon brush setup was to make the alternate firing
twin run with a single, double secondary output coil, by grounding out the cylinder that’s
not suppose to fire, via one of the carbon brushes, and a ground circuit in the flywheel.
There’s a bakelite piece riveted on the inside of the flywheel with a little “contact spring” that’s
suppose to be the coil grounding path.
What I ended up with was the most irratic running motor I ever worked on.
It’s a magneto problem for sure, and in retrospect, thinking about it now,
I bet that the one cylinder is partially “sparking” the plug when it’s not suppose to.
I have a video of it running, but I’m not finding it on YouTube right now.
If there’s interest, I can try to post it there.
Perhaps this would be a good motor to re-visit, but thanks for reminding me of my defeat, lol
Prepare to be boarded!
