Any plug readers?

yellow rose said

It’s rich at a cruise. If you are running vacuum advance, you don’t have enough timing. If you don’t, the timing is pretty close. To see anything else you need to take the shell off.

You also need to tune to the leanest cylinder. I wouldn’t change a tune up based on one plug.

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Thanks for the info. Actually that was 2 plugs one from #3 one from the #2. Easy ones to get to for a quick check of an inner and an litter. But I understand what you are saying about looking at them all before anything else. With the one being cracked I'm replacing them all so I will get a better look then. Bothered me about timing with that cracked.