Topic: 1954 Evinrude 7.5hp increase power? – Page 4

This topic has 38 replies, 19 voices, and was last updated 8 years ago by bsedwebt.

Viewing 9 posts - 31 through 39 (of 39 total)

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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
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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