I might also suggest using Anti-Seize on future plug installs. The cast plug won't stick or gall in the aluminum head. Use caution and put it only on the threads and seat area-not the insulator.
I've actually seen a new Harley come in for a 500 mile service-back then you changed the plugs at the first service-when the tech took the plug out-out came the threads as well.
I was told by a reputable mechanic that you can also use a drop of synthetic motor oil. HE says this will even work better. Personally I have done this for two years now.
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