That's a good example of where names of parts can confuse us all....I've been unclear about that sometimes, too. Exactly what *is* the first full-fuselage-sized bulkhead/former??? To me, I always think of the firewall as the place the engine hangs.

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I want to know more about this "wet and black" plug situation. Mine is frequently that way on post-flying session inspections.... but my transition is clean, idle is solid, not rich. Top end is good.

I also don't spend hardly ANY time at full throttle, because of my flying style.

Anyone can shed light on this?
Are my plugs not "tan" because I'm not running the engine hard enough?