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  1. I

    Need some input on 50 HP Johnson problem.

    omc PART # 0438556 Mounted on pulse port. Plug leads not replaced. Water pump 2 years old. 160#
  2. I

    Need some input on 50 HP Johnson problem.

    Pulled pump off but see no leakage past diaphgram so the mystery continues.
  3. I

    Need some input on 50 HP Johnson problem.

    Both cylinders jump over 3/8".
  4. I

    Need some input on 50 HP Johnson problem.

    Will do. Thank you
  5. I

    Need some input on 50 HP Johnson problem.

    I have a tester. I'll check. Thanks
  6. I

    Need some input on 50 HP Johnson problem.

    Got it. Make sure each cylinder is firing when trying to come up on plane.
  7. I

    Need some input on 50 HP Johnson problem.

    Pulled flywheel and the key is fine. Not sure what I'm looking for with a timing light per your post?
  8. I

    Need some input on 50 HP Johnson problem.

    Need some help figuring this out please. 1987 50 hp Johnson. Idles/runs fine until you reach the point where the boat should be coming on plane. After that it struggles to increase rpms. Does this about 90% of the time. Some times it will lag as described and then come up in rpms and run as it...
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