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Attitude Adjustment
[ Q ] Dear Doctor, I have a 2003 SportCraft 272 hardtop powered by a 300 hp MerCruiser 5.7L MPI that connects to a Bravo Three drive with a jackshaft. The gear ratio is 2-to-1, and I operate the boat with a full load most of the time, so I run a 20-inch-pitch set of props.
Overall, this is a satisfactory setup, but during acceleration from a stop, it feels like there’s a flat spot around 1,500 to 1,800 rpm. The engine runs smoothly prior to reaching and after hitting this rpm range. I performed a complete tuneup, including spark plugs, wires, distributor cap, rotor and fuel filter. This helped for a…
