Why? How? What about switching to "both"?

Switching to "both" would constitute switching back to a good mag.

As for the reason, it's because without either mag operating (one shorted
out on purpose, the other dead), a bunch of unburned fuel can accumulate
very quickly. Restart the fire by switching the good mag back on, and you
could wind up with a big fireball or exhaust fire.

Good stuff -- I learned something vital here today. Gotta store that one in
the old brain bank.

Thanks, guys.
--
Jay Honeck
Iowa City, IA
Pathfinder N56993
www.AlexisParkInn.com
"Your Aviation Destination"