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    Mercruiser 485 I/O overheats all the time

    4Winns 1982 Boat that runs good yet, but engine does not cool. Closed loop heat exchanger on engine. It seems I can never dissapate the heat being generated by the engine fast enough. Any suggestions as to a fix, or is this just a bad marine engine design and there is not fix???:% Dave...
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    Merc 1986 150 Max High Idle after Carbs cleaned

    Syncronized carbs, but with water flusher on motor (150 - 1986 no oil injection), engine starts with 1/4 turn of key but runs to just under 2,000 RPM. Lower port idle screw totally off stop but still races at that RPM - I shut it down immediately. Carbs butterflies are in closed state. What...
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