Thanks to all who responded. Summary of responses recommends making
sure that the plug has 1/2" of threads instead of 3/4", which would
allow a portion of the threads down into the combusion chamber where
they can attract by products of the combustion. Permatex Anti-Seize
is also recommended. One response mentioned that pouring a few
tablespoons of water into the carbs can clean out the chamber, and the
method of loosening, tightening and applying penetrating fluid
inbetween will work OK.
Mike Barron
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