Just don't install the jumper at position one (in the drawing you linked too)

What it should say is "Use when only left mag. is......
 
Removed the jumper

Sure enough, the jumper was installed. So the plane had two impulse coupled mags, but was starting on the left mag only. Of course, that was the older mag.
Starts better already.
I wonder how many other experimental planes are wired the same way?
Thanks again.

Just don't install the jumper at position one (in the drawing you linked too)

What it should say is "Use when only left mag. is......