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  1. Replies
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    Are you talking about the ports on the 31.8...

    Are you talking about the ports on the 31.8 motors or on the three cylinder?

    I have some older (76-94) motors in both 25 and 35hp and Im trying to piece together the internal differences between...
  2. Thanks for the input so far guys. Being this...

    Thanks for the input so far guys.

    Being this is a points motor, is there any guideline as to the upper limit on RPMs are?


    Being its not governed it will most likely rev higher, but what is...
  3. Yes, I can understand that as a general rule to...

    Yes, I can understand that as a general rule to go by.

    The issue with these motors is that they are of the same displacement with only minor internal changes between the 35 and 25/20.

    The carb...
  4. Yeah. I know from racing RC boats that the larger...

    Yeah. I know from racing RC boats that the larger prop with less pitch will be more efficient and on a 16’ or larger boat glass boat would be the way to go due to the weight, but I feel the 14, tin...
  5. 31.8 omc 25hp vs 35hp gearing quandary.

    I have two motors Iím tinkering with and I pulled down both lower units and found the 35 has much lower gearing than the 25.

    The 35 is a 76 model and the 25 is an 84.

    I want to use the 35 power...
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    Boat is currently under construction so pics...

    Boat is currently under construction so pics wouldn't help much.

    Its your basic 14' aluminum vee with two pedestal seats and a front deck with trolling motor and battery. I removed the stock bench...
  7. Replies
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    I’m working up a tapered spacer to tuck the motor...

    I’m working up a tapered spacer to tuck the motor in but I had it out for a couple weeks to modify it as it had too much taper originally. This is with the motor on the pin closest to the transom.
    ...
  8. Replies
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    Thanks pprint! Especially for the jet chart,...

    Thanks pprint!

    Especially for the jet chart, that will give me a better starting point than trying to suss out the info from different threads.

    As far as speed, yeah I need to move up to a...
  9. Replies
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    Quoting myself here to keep things coherent. ...

    Quoting myself here to keep things coherent.


    Took the boat out and saw no improvement in speed. I was able to trick it into idling with the primer set on cold start and that worked OK, but the...
  10. Replies
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    That looks like a nice setup, but dual carbs...

    That looks like a nice setup, but dual carbs seems like it would be a PITA.


    OK, I got my 1 3/8" carb on and it starts and runs but the idle jet is off.


    Iw will idle ok with the primer out...
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    Thanks PPrint. Any idea what your carb is off...

    Thanks PPrint.

    Any idea what your carb is off of?

    Do you have an idle jet? If so what size?
  12. Replies
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    Im currently setting up a 25hp Evinrude with this...

    Im currently setting up a 25hp Evinrude with this carb and was wondering if you would tell me your jetting so I can have a rough estimate as a starting point for mine?

    My carb is off of a 70hp iof...
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    Great find! I love the way things were worded...

    Great find!

    I love the way things were worded back then, very elegant.

    It does make me wonder though how many people took a good running engine and turned it into a balky heap of dung vs how...
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    Hey Scherfz, glad to see you made it over. I...

    Hey Scherfz, glad to see you made it over.


    I have been reading here quite a bit lately but this may be my first post. The engine gurus here speak in terms of Cubic inches of the different blocks...
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