"Jay Honeck" wrote:
Little BB's of lead fell out of a couple of them as I pulled them, and
after cleaning they all tested okay.

My Lyc's plugs used to do that until I switched to hotter plugs. Also,
for taxi the mixture must be leaned almost to the point that the rpm
drops and taxiing must be done at no less than 1,000 rpm. All three of
these precautions are according to Lycoming's plug fouling bulletin. In
addition, before shutdown the engine should be run lean for 15-20
seconds at 1,800 rpm.

That gd LL is a mortal pain. Unfortunately, my O-360 is
high-compression; there's no STC for mogas.
--
Dan
C172RG at BFM