ANSWERS: 2
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I imagine you'd do it the same way you'd do any other engine. With a spark plug wrench. Or rather, a spark plug socket on a 3" extension and a 3/8" ratchet. Are we talking about clearance on a particular cylinder, or just generally?
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Hmm! Try unscrewing the bad one (anti clockwise), replace it with a good one, by screwing in clockwise!
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