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    74 Mercruiser 140 hp will rev up but not move faster than 2 mph

    Took the boat out was cruising along fine. Stopped to fish a bit, started it up and it would not cruise, just go about 2 mph and do a lot of bubbling at the trim. It would rev up but not go above 2 mph. Had to drive back about 2 miles to the dock that way.What would cause it to all of a...
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    Starting motor without water to stern drive

    I have a 1974 Mercruiser 140hp 4 cyl I/O. For about 45 seconds ran without water, how much, if any damage was done? Had dog ears attached fell off when I engaged throttle to rev up.
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    1974 Mercruiser 140 4 cyl

    Idles fine in the driveway and on the water. Give it full throttle and it sputters and backfires from the carburater. Won't go over 10 mph. I changed the points, condenser and plugs. Put HEET in the gas tank with new fuel and stabil. Sprayed carb cleaner in the carb and still have the same...
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