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    Do not trust single plug or 3 plug systems

    Just wanting to give some advice. Do not trust that all the water drained out of the block. Disconnect the hoses going to the block and poke them. I just winterize my boat and the one drain was completely clogged.
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    Mercruiser 5.0 mpi only 4000 rpm

    I have 2007 sea ray 240sd with a 5.0 mpi with a bravo 3 with 22p props. Engine serial number 0w661357. I recently boat the knowing it had issues. I can not get the boat above 4000. When I 1st got the boat it would go above 3500. I have changed the plugs with NGK ITR4A15, new cap rotor, wires...
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