just watch the gap, ive had a spark plug in an older engine a few years ago and the plugs gap kept getting smaller, i would re gap it once a week, turns out the metal was fatiguing from being regaped so much, the electrode broke of and fell into the engine, that was the end of that 2 stroke! so as a general rule, re gap when it needs it, and if you find yourself re gaping it often(more than 3 times) i would get a new plug,