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8hp Mercury boat motor and need spark plugs what size are they?
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∙ 16y ago
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I have a 1982 Mercury 25hp boat motor and it wont fire. It has good compression but wont fire-- What could be the problem?
Perhaps the spark plug system is not sending electricity to the spark plugs.
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.40
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The boat has to be taken out of the water and hauled to a proper mechanic for this type of question. It's either 2 or 6 plugs in a 4 cylinder. It's worth spending the money to solve this and good to know for when an emergency comes up.
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I would say 50 H.P.
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