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  1. #1

    Default trouble shooting 25 hp evinrude

    1986 rude 25 hp. It idles well but stalls when trying to rev it up. Any advice? I ordered a carb and a fuel pump rebuild kits.

    thanks

  2. #2
    Join Date
    Sep 2010
    Posts
    19,075

    Default Re: trouble shooting 25 hp evinrude

    I would be surprised if the carburetor kit did not fix it.----It is often the first thing that folks look at.

  3. #3
    Join Date
    Jun 2013
    Location
    Duluth Mn
    Posts
    2,646

    Default Re: trouble shooting 25 hp evinrude

    How long was it stored? Did it have fuel with ethanol in it? Make sure the fuel jets/passageways are physically cleaned open to the correct opening size. Often times even though they "look" open, or air can pass through, they are still partially restricted. Get yourself a welding tip cleaner tool, they are cheap, and clean with the largest size that fits snuggly in the opening.....while using a good quality carburator cleaner. I like CRC Throttle Body Cleaner. It dissolves deposits quite easily.....it's strong. Avoid getting on your skin or even some plastics. I am working on a Yamaha later today that was stored for 10 years, it is going to get the aforementioned treatment, along with a hydrochloric acid cleaning of the fuel tank.
    Last edited by timguy; 03-31-2020 at 02:07 PM. Reason: Typo

  4. #4

    Default Re: trouble shooting 25 hp evinrude

    Quote Originally Posted by timguy View Post
    How long was it stored? Did it have fuel with ethanol in it? Make sure the fuel jets/passageways are physically cleaned open to the correct opening size. Often times even though they "look" open, or air can pass through, they are still partially restricted. Get yourself a welding tip cleaner tool, they are cheap, and clean with the largest size that fits snuggly in the opening.....while using a good quality carburator cleaner. I like CRC Throttle Body Cleaner. It dissolves deposits quite easily.....it's strong. Avoid getting on your skin or even some plastics. I am working on a Yamaha later today that was stored for 10 years, it is going to get the aforementioned treatment, along with a hydrochloric acid cleaning of the fuel tank.
    I found this stuff years ago and I like it better than any of the sprays.

    Berryman Chemtool

    https://www.autozone.com/fuel-and-en...6oz/139313_0_0


    I have done dozens of carbs over the years and countless parts with excellent results and no appreciable breakdown in effectiveness.

    Simply disassemble the carb and soak for 3 to 24hrs depending on how bad the gum buildup is. A small brush and or torch tip cleaners as mentioned above can be used if you desire for faster action.

    I prefer to soak as you can shake and or tumble the carb parts in this and it will get behind the welch plugs and on both sides of the tiniest passages in most cases. You will say there will still be air pockets and I will tell you it will creep over all surfaces without trouble.

    It is not to be used with rubber gaskets, plastic, or cork bowl floats.
    Last edited by RaisedByWolves; 03-31-2020 at 03:10 PM.

  5. #5

    Default Re: trouble shooting 25 hp evinrude

    Thank for tips. It ran great last year. Sat outside in shed over winter. Will report back after carb and fuel pump kit show up.

  6. #6
    Join Date
    Jun 2013
    Location
    Duluth Mn
    Posts
    2,646

    Default Re: trouble shooting 25 hp evinrude

    Do you think it had ethanol in the fuel?

  7. #7

    Default Re: trouble shooting 25 hp evinrude

    Rebuilt carb and fuel pump. Tried today. Fast idle, can't back it down. Runs at low speed but dies out if I try to accelerate.
    Time for me to find a mechanic.
    Thanks for the input.

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