Quote:
Originally Posted by Quicksilver
I'd try some penetrating oil on it.
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+1. Don't apply brute force. Allow the penetrant to gradually soften the carbon so the threads will wipe the carbon off as you remove it. Relatively hard carbon and steel spark plug threads are at work against softer aluminum threads in the cylinder head. Take small steps while allowing the solution to loosen the carbon.
However, penetrant sometimes isn't as effective in softening/removing carbon compared to regular strength carb cleaner (e.g. Berryman's), that can remove carbon from pistons soaked overnight or Chevron Techcron. If you have to resort to this level of soaking, relube the cylinder and change the oil.
Another method of decarbonizing the combustion chamber is to inject a fine stream of water into the intake (raise idle). This will scour the chamber of deposits as well as create a smoke screen in your neighborhood.
Sherwood