2004 John Deer Buck Utility ATV 500, 500EX and 500EXT Service Manual, Page 166Get this manual

2004 John Deer Buck Utility ATV 500, 500EX and 500EXT Service Manual, Page 166

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A too "hot" plug will result in overheating, pre-ignition, etcA too "cold" plug will result in fouling (shorting the spark plug) or may create carbon build up which can heat up redhot and cause pre-ig

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