"Reading" plugs with modern fuel...is hard. A bit of discoloration is all you will see, most of the time. Some "old" rules still apply. Wet? Black? Too rich. White and dusty...has any one seen this in the last few years? Too lean. The Vacuum gauge works well. The "Ping" test and adjustment works too. These are not fussy motors. We complain, and obsess over all the stuff any way. It makes us happy.
