Paul:
Going back to the Stator with the two high voltage windings.
Following is from patents assigned to OMC (they had 954 patents):
I searched for "CD" or "Capacitor Discharge" in the patent title, which yielded a few ideas.
4391236 is perhaps the simplist, along with 4346690, 4479467, 4577609 and 5345910.
Each of these can lead back to earlier patents.

Referring to 4391235, if one jumps out the automatic retard circuit withing the dotted lines, design reduces down to:

1) High Voltage winding on Stator
2) Bridge Rectifier
3) a few microfarad, few hundred volt mylar capacitor
4) a 1000 volt SCR
5) some sort of trigger coil
6) an ignition coil

I've seen similar patents assigned to Mercury Marine.

JCP

I just got a bunch of stuff on the Mercury.
I also have the Service Training Notebook which has lots
of schematics over the years. They keep making changes.
My friend recommends buying junk engines for a couple hundread
as the parts are well over $500.

Paul Lamar