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yamaha 2004 40hp 4 stroke

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  • yamaha 2004 40hp 4 stroke

    Im considering purchasing a dingy with a 40 hp 2004 yamaha 4 stroke triple carbs
    Any problems with these engines especially carbs????

  • #2
    Re: yamaha 2004 40hp 4 stroke

    I have heard they have very small passages and clog easily
    Also hard to sync

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    • #3
      Re: yamaha 2004 40hp 4 stroke

      Originally posted by 99yam40 View Post
      I have heard they have very small passages and clog easily
      Also hard to sync

      thanks much appreciated

      Comment


      • #4
        Re: yamaha 2004 40hp 4 stroke

        The carburetors in a Yam F40 are particularly problematic.

        If you buy the motor, and if you have carburetor problems, remember the Yamaha F25. If F25 jets are installed in an F40 that won't run worth a darn, those F25 jets will make it seem like a new motor. Virtually all of the carburetor issues will be over. Just keep clean fresh fuel in the motor. Drain the carb bowls if it is going to sit idle for a while.

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        • #5
          Re: yamaha 2004 40hp 4 stroke

          Originally posted by boscoe99 View Post
          The carburetors in a Yam F40 are particularly problematic.

          If you buy the motor, and if you have carburetor problems, remember the Yamaha F25. If F25 jets are installed in an F40 that won't run worth a darn, those F25 jets will make it seem like a new motor. Virtually all of the carburetor issues will be over. Just keep clean fresh fuel in the motor. Drain the carb bowls if it is going to sit idle for a while.
          Any idea what it should cost to have the F25 jets installed??

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          • #6
            Re: yamaha 2004 40hp 4 stroke

            Originally posted by bellavista803 View Post
            Any idea what it should cost to have the F25 jets installed??
            Too many variables for me to hazard a guess.

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            • #7
              I am having same issue. Just want to make sure I am reading this correctly. So you are saying to replace the jets of an F40 with the jets of an F25 or it has F25 jets and they need to be changed to another size jet?

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              • #8
                Originally posted by ChefMercury View Post
                I am having same issue. Just want to make sure I am reading this correctly. So you are saying to replace the jets of an F40 with the jets of an F25 or it has F25 jets and they need to be changed to another size jet?
                An F40 comes with jets (3) for an F40. The F25 comes with a jet (1) for an F25.

                The F25 jet is larger than the F40 jets.

                The installation of the larger F25 jet into the F40 will help to cure carburetor related problems that are somewhat inherent in the F40.

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                • #9
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                  Thank you!!! Would you happen to know the part number of the F25 jets? I would like to order them asap!!

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