Search results

  1. J

    Prop test advice

    I began testing props today. My 8hp mercury comes stock with a 9 pitch prop. It lugs a bit. My local dealer loaned me a 5.5 pitch. The boat ran exactly the same speed according to gps only the 5.5 pitch ran as if ringing its neck. I am now going to try a 7 pitch. Now what will this one do...
  2. J

    Cannot reach rpm (new motor)

    I have a new 8hp two stroke mercury on a 17ft Osage cargo canoe. My problem is I can't reach full rpm. The motor is obviously lugging. I have tried several tests. Alone in the canoe the bow will not go down. With my son in the front and the deep cycle battery the canoe tries to plane and...
  3. J

    exhaust blocked?

    Since I'm not as familiar with large outboards as with smaller 2 cycles can the exhaust block on these larger engines. I'm having low power problems.
  4. J

    71 50 hp Johnson

    I am trying to diagnose whether I have a failing fuel pump or if there is another problem? Should there be any measurable pulsing in the impulse hose to the fuel pump?
  5. J

    72 johnson misfiring

    I removed the carbs as Joe Reeves instructed. Found that both low speed screws are scored/grooved. Also removed leaf blocks for inspection and found 4 leaves on each block not totally closed. Slipped a .004 or .005 feeler gauge under each distorted leaf with no effect on the leaf. Used a...
  6. J

    72 johnson misfiring

    I have a 1972 50 hp johnson that runs very rough idling. It stalls unless idling high. Today I ran it about 2 miles and as usual it ran very good above 1/2 speed. But returning it would never reach full speed. It seemed to be starved for fuel. I tried slightly closing the choke but it...
Top