On the four HD-25’s I worked on, I always wondered what the two
"unused" holes were for in the crankcase front half.
I got to working on a HD-15 today, and I see a piece bolted
to those two holes. It appears to be for grounding the magneto.
Were they not used on the HD-25’s, or am I missing them?
I don’t currently have an HD-25 that will idle, so shutting them
off isn’t a problem, lol.