It came with a Champion?!? That's something new. I had heard the other Champion plug mentioned was a bit short, so maybe that's the right one. BTW- for break-in you want to run it at various throttle and rpm settings, don't baby it too much and don't be afraid to rev it up a bit either. Short blasts of full throttle are actually better than running it too easy. It helps to seat the rings.

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If it ain't broke, and you mess with it long enough, it will be.