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Yamaha 25 HP 4 cycle Carb Problems ??

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  • Yamaha 25 HP 4 cycle Carb Problems ??

    Hi, This subject was posted by "tjtraver" on 2002-07-03. I was wondering Todd, if you had any successful outcomes, because my motor is doing the exactly the same thing! I have pulled the carby apart and everything looks 'in order', also all the fuel lines are clear. After about 20 minutes flat stick, she dies. Any help would be much appreciated, as before this problem the motor has never let me down. "I have a 4 or 5 year old yahama 25 hp 4 cycle engine that starts and runs fine for about 30 minutes ... then the engine quits running and has fuel running out the overflow from the top of the carb... Anyone have ideas what's going on here ? Is it somehow fuel presure related ? Any insights into this problem appreciated ... Thanks, Todd Traver"


  • #2
    Re: Yamaha 25 HP 4 cycle Carb Problems ??

    hello most likly trash in the fuel lines or a bad needle/seat or a faulty float. time to test not a hard job but sometimes must be done.
    no tech questions by PM, they wont get answered.
    you have to be trusted by the people that you lie to .

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    • #3
      Re: Yamaha 25 HP 4 cycle Carb Problems ??

      Had the same thing.Turned out to be a float needle valve problem.Disasemble the carbs carefully and check and clean all the float parts in each of the carbs. I had 4 carbs on my 50 4 stroke Yammy. These guys have a habit of gumming up for no apparent reason.

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      • #4
        Re: Yamaha 25 HP 4 cycle Carb Problems ??

        thanks for the advice. I will let you know the result....

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        • #5
          Re: Yamaha 25 HP 4 cycle Carb Problems ??

          I ended up changing gas tanks and it is not a problem now. I had several mechanics fix the motor, but it turned out to be a tank issue. Hope this helps.

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          • #6
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            Re: Yamaha 25 HP 4 cycle Carb Problems ??

            Walmart carries a fuel/water separater/filter for $27, easy 2 screw installation on transom, can save you a lot of grief with water, debris,ethanol,old, contaminated fuel problems. A good investment!

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