Fouling #1 Plug

["Ken Waringa" <kwaringa@dynsys.com>]

Took the 71 TR6 for a run of over a hundred miles with some other folks on
Saturday.  Toward the end of the day it was skipping some.  Last night I
pulled the plugs and found the #1 plug very black.  The other 5 plugs were
light brown and looked great.  What would cause only one plug to foul?
Could it be valve adjustment, front carb adjustment?  Your help and wisdom
are appreciated.  I need to get it running right to make the 4 hour run to
Lake City the end of October.

Ken Waringa
71 TR6
74 Midget
74 MGB
79 MGB