Merc 500 rough running

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  • July 27, 2019 at 10:29 pm #180382
    JASON RASER
    Participant

      US Member

      I just rebuilt the carbs, went through the magneto, new spark plug wires, good plugs, have new gas, sprayed half a can of Seafoam down the carbs. It runs on high idle but overall has hard starting and a rough idle then dies on slow idle. Should I rebuild the fuel pump or am I missing something obvious?

      July 28, 2019 at 6:37 am #180385
      Randy in Tampa
      Participant

        Take off the carbs, take them apart and soak them in parts cleaning solution overnight,wash them and blow them dry with compressed air 😉

        Rotary valve Johnson’s Rule!

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