Automatic choke
            Engine flooding
  Engine stalls:
             Idle RPM too low
             Idle mixture screws
             Engine flooding
             Automatic choke
             Dirt in carburetor
             Accelerator pump
             Leaking gaskets

Poor Fuel Economy?

  Fuel leaks
  Operator habits
             Prolonged idling;
             slow acceleration;
             failure to cut back on throttle once boat is on plane;
             boat over loaded;
             uneven weight distribution
Engine laboring?
             Bent, damaged, or wrong propeller.
                Water test boat for proper operating
                RPM at wide open throttle
  Clogged flame arrestor
  Engine compartment sealed too tight
              Not enough air for engine to run properly
  Boat bottom Dirty (marine growth), hook, rocker
  Carburetor Idle mixture settings, accelerator pump adjustments,
      linkage binding, choke adjustment, carburetor flooding over,
       main fuel jets
  Improper fuel
  Crankcase ventilation system not working
  Engine needs tune-up
  Engine running too cold or too hot
  Plugged or restricted exhaust
  Engine Low compression