P 50 rotory valve fuel mixture

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  • September 4, 2015 at 10:49 pm #2453
    brad-ernst
    Participant

      Does any one know what the fuel ratio should be. I have been told a lot of different mixtures like 40:1, 24:1, 18:1, 8:1, 40:1 with some 30 weight oil. Don’t really know what to think anymore.

      Brad Ernst

      September 5, 2015 at 3:19 am #23255
      Mumbles
      Participant

        Hi Brad

        This page from an old Johnson book says one pint per gallon which makes it an 8:1 ratio fuel mix. That’s not too uncommon with the rotary valve motors.

        Stick with the 8:1 mix and the motor will probably outlive you as it has others. 😀

        September 5, 2015 at 12:39 pm #23270
        bill-loveland
        Participant

          And the best part is you’ll always be able to find your way back to the dock – just follow the oil slick!

          September 5, 2015 at 12:49 pm #23272
          chris-p
          Participant

            My XR will make a mess of the lake once I get it fired up!

            September 5, 2015 at 2:30 pm #23278
            mogems-yahoo-com
            Participant

              Point of order: I believe that one pint to one gallon makes it 16:1 . Doncha think doncha?

              September 5, 2015 at 3:16 pm #23286
              Mumbles
              Participant
                quote mogems@yahoo.com:

                Point of order: I believe that one pint to one gallon makes it 16:1 . Doncha think doncha?

                NO! One gallon has four quarts in it and each quart has two pints in it. Four times two equals eight. A half pint of oil to a gallon makes a 16:1 mix.

                What mix have you been using in your motors?

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