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1993 2-stroke 50HP ELPTO new to me

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  • 1993 2-stroke 50HP ELPTO new to me

    Hi, first post to the forum. Never had a Mercury before and newish to tinkering on outboards. I just bought a 20' party barge with a Mercury 50HP on the back.
    Serial #0D250899
    1993 2-stroke oil-injected carbureted 3-cyl power-tilt
    Engine cranks right up, but only runs full throttle for 10-15 seconds before slowing down and conking out. If I keep it around 2500rpm or below, it will usually run fine. Once I throttle any higher, it slowly dies. If I pump the primer bulb on the fuel line, that can keep it running at high throttle. It seems that it runs the smoothest when I pump the bulb wth quick shallow pressure.
    I have drained the carb bowls and plan on checking/changing the fuel pump and filter. How can I tell which pump I have? It looks gray, not black or red.

    My other issue is that the power tilt up quick working. There is a button on the throttle lever as well as on the motor itself. I can hear the motor run when I push the down button, but get no response at all when I push either up button. It seemed to struggle when it did work.

    Any help is greatly appreciated.
    Steve

  • #2
    The diaphragm kit is the same for both pumps 21-857005A, And it sounds like the solenoids or relays are giving out on the trim. If it is struggling you might have water in the pump motor

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    • #3
      Thanks, Ski. Looks like your the one doing all the work on this site. I appreciate you being here. Keep up the good work.
      That's funny, I never even thought of comparing the part numbers.
      Any recommendations on which plugs to use? I was planning on replacing plugs and wires as the top wire is compromised and the others just look really old.

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