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    1974 mercruiser I/O overheat

    I have a 1974 mercruiser 140 H.P I/O sterndrive, i just bought the boat and hooked it up to the hose and ear muffs and it overheats. I am not sure if it is sucking water up or not. I am 21 and this is the first boat i bought could someone please help! Thank you,
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