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1990 Evinrude 25 HP E25RESB Low idle problems

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  • tom071984
    started a topic 1990 Evinrude 25 HP E25RESB Low idle problems

    1990 Evinrude 25 HP E25RESB Low idle problems

    I posted some about this yesterday. Just to make it clear I know very little about engines and carburetors so I may need directions to be broken down barney style. The problem I am having is that the motor will start up and run just fine at high rmp if I start it with the throttle up till the butterfly is open. It begins to run rough and will die when I get close to bring the throttle the whole way down. I have cleaned the carb and it seemed that all orifices were clear. The s/s needle valve was set at 3.4 turns from seat. I set it to 1.5 turns and it still wont run at idle. The plugs were black and dirty when I changed them out.

    I am including a picture of where the butterfly begins to open. What are the two notches for on the plastic part(don't know name)? Should it start to open at those notches?

    I thought this could be fuel pump bit it runs excellent under high rpm's. Maybe a weak fuel pump?

    Click image for larger version

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  • JackStrawEvinrude
    replied
    Did you ever resolve this?? I am having trouble with my '92 E25ELENS

    Runs at full throttle all day long but won't idle any more.

    Leave a comment:


  • Bosunsmate
    replied
    Re: 1990 Evinrude 25 HP E25RESB Low idle problems

    Originally posted by tom071984 View Post
    Where is the idle adjustment screw on this engine? It is a tiller steer, pull start...thanks
    Screw, top starboard side of carb

    Leave a comment:


  • tom071984
    replied
    Re: 1990 Evinrude 25 HP E25RESB Low idle problems

    Where is the idle adjustment screw on this engine? It is a tiller steer, pull start...thanks

    Leave a comment:


  • Bosunsmate
    replied
    Re: 1990 Evinrude 25 HP E25RESB Low idle problems

    Originally posted by tom071984 View Post
    I jumpered a spark tester up while running the engine today and it appeared that the bottom plug was misfiring. The spark was not as good as the top plug either. Not really sure how to trouble shoot from here.
    ISSUU - CDI Electronics Practical Outboard Ignition Troubleshooting by CDI Electronics

    Leave a comment:


  • tom071984
    replied
    Re: 1990 Evinrude 25 HP E25RESB Low idle problems

    I jumpered a spark tester up while running the engine today and it appeared that the bottom plug was misfiring. The spark was not as good as the top plug either. Not really sure how to trouble shoot from here.

    Leave a comment:


  • James R
    replied
    Re: 1990 Evinrude 25 HP E25RESB Low idle problems

    Sounds like air is being sucked in through the primer. When the motor tries to stall try spraying a little fuel mix into the carb throat.
    If it picks up you could have air leaking in or the idle jet is blocked.

    Leave a comment:


  • tom071984
    replied
    Re: 1990 Evinrude 25 HP E25RESB Low idle problems

    does this model have a timing advance screw? Also does anyone know what the timing is supposed to set to?

    Leave a comment:


  • Bosunsmate
    replied
    Re: 1990 Evinrude 25 HP E25RESB Low idle problems

    advance timing

    Leave a comment:


  • tom071984
    replied
    Re: 1990 Evinrude 25 HP E25RESB Low idle problems

    increase idle without opening butterfly

    Leave a comment:


  • Bosunsmate
    replied
    Re: 1990 Evinrude 25 HP E25RESB Low idle problems

    Originally posted by tom071984 View Post
    Where do you adjust for RPM on this motor? If you can tell me a part number that would help tremendously...Thanks

    http://www.**********/parts/search/B...ESB/parts.html
    what do you mean?

    Leave a comment:


  • tom071984
    replied
    Re: 1990 Evinrude 25 HP E25RESB Low idle problems

    Where do you adjust for RPM on this motor? If you can tell me a part number that would help tremendously...Thanks

    http://www.**********/parts/search/B...ESB/parts.html

    Leave a comment:


  • Bosunsmate
    replied
    Re: 1990 Evinrude 25 HP E25RESB Low idle problems

    front part of fuel pump has it

    Leave a comment:


  • tom071984
    replied
    Re: 1990 Evinrude 25 HP E25RESB Low idle problems

    Dumb question but does this motor have a fuel filter? I never saw one while working on it.

    Leave a comment:


  • tom071984
    replied
    Re: 1990 Evinrude 25 HP E25RESB Low idle problems

    Outboard Motor Repair- 35 evinrude won't idle

    This article has me thinking....I do not remember seeing part #10 when I tore the carb apart for cleaning....there was no o-ring inside of there...also part #13 says it is also an o-ring...I think there might have been a washer there...

    http://www.**********/parts/search/B...TOR/parts.html

    I ordered a carb rebuild kit Sunday and it should be here Friday. Would part #10 and #13 be in it?

    Leave a comment:

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