I'd keep both running....I don't see how shutting down mags that are
perfectly running makes for a better de-fouling. Plus, keeping them both
going will prevent anything from fouling those plugs as well.
"Roger Long" wrote in message
...
Should you clear a fouled plug on run up with the mag on "Both" or
switched
to the side that is running rough? Since it's just heat, I can't think of
any reason why one way would be better than the other.

--
Roger Long