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Anywhere from 0.040 of an inch to 0.050 of an inch will be acceptable. The gap is not that critical, the wider the gap the less chance for carbon deposit within the electrodes. The high voltage circuits does provide enough energy to generate a blue spark accross the mentioned gaps. Do not dwell on the subject. Gap both plugs the same and enjoy your Merc. Please use high quality oils and gas, little engines deserves the best. Pops D
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