1954 Evinrude 7.5hp increase power?

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  • April 9, 2016 at 1:09 pm #34569
    baron0418
    Participant

      Bill is right,16-1 is a must. Or yeah,you will ventilate the crankcase!

      April 10, 2016 at 12:47 am #34605
      tom-c
      Participant

        How big is your boat?

        April 10, 2016 at 12:58 am #34608
        bsedwebt
        Participant

          9′ long, 4′ wide, 160lbs empty, 550lbs capacity rating, 8hp max, fiberglass catamaran with a center sponson about 14" deep. Will have 2 adults, fuel and gear etc… of about 440lbs and of course the motor weight of about 50lbs. See prior page showing a photo of it.

          June 21, 2016 at 7:51 pm #38716
          bsedwebt
          Participant

            So I finally got around to getting another prop – got a used brass 3 blade. Will need a bit of cleaning up around the edges but in good shape overall. I took the original prop off and found what appears to be a decaying string wrapped around the prop shaft by the lower unit. I did not take it off yet fearing that this was supposed to be there for some reason. The only time I have seen string on a prop shaft was on a more modern motor that had caught some debris and wrapped it up and caused the seal to leak in the lower unit. This appears to be old decaying string that is wrapped around the shaft that could be some sort of spacer. I smelled and saw no leaks in the lower seal. My question is – is this supposed to be there or should I remove it?

            June 21, 2016 at 9:11 pm #38724
            frankr
            Participant

              US MEMBER PAY BY CHECK

              Old fish line from 1950’s vintage (before monofiliment)

              June 21, 2016 at 9:42 pm #38726
              chinewalker
              Participant

                US Member

                Yep, get it off there!

                June 21, 2016 at 9:46 pm #38727
                bsedwebt
                Participant

                  Thanks! I was wondering if that was some old way of creating a spacer or some sort of seal – it was nicely wound but the outermost part was coming loose. I noticed no ill performance when using the motor and hopefully no damage to the seals when I remove it.

                  June 22, 2016 at 2:05 am #38736
                  shoestringmariner
                  Participant
                    quote Wedgie:

                    What size boat are you running? It may sound counter intuitive, but a slightly bigger boat may plane easier because of bigger surface area.

                    that is gorgeous

                    June 22, 2016 at 9:21 pm #38785
                    bsedwebt
                    Participant

                      That looks just like my motor – nicely restored. It is a beauty and so is mine. This little boat is not going anywhere – I searched long and hard for the 9′ Livingston LV9 and got a good deal on a slightly used 2014 model. I got it to plane and it screams with one person but 2 people it pushes through. I also have a 1996 Johnson 8hp 2 stroke that runs perfect and that really screams – low 20’s MPH with one person but it will not plane with 2 people – I ordered a 8 x 7 pitch prop for that motor to see what it will do instead of the 8.5 x 9

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