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I have bought some Iridium Spark plugs from eBay, before I install them I'm just curious about a the gap size and setting the gap. I know the gap size is supposed to be 1.0m. I hear both sides of the story that some say the gap is pre-set and some say they need to be adjusted. According to the NGK the plugs are set to a certain gap but that they need to be reset to manufactures specs but the point on the Iridium's is tiny I'm worried about breaking it.
Do I just leave the gap as pre-set or do I need to change it?
Do I just leave the gap as pre-set or do I need to change it?