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  1. #1
    2003 Yamaha FX140 timlynn47's Avatar
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    2003 Yamaha FX Idling Rough

    Took my FX140 out yesterday. Runnning great at high end. Idles a bit rough and dies at low end, but if I give it a little gas it idles ok. Starts back up after it dies. Thoughts?


  2. #2
    volltrex's Avatar
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    Check that the bypass air motor hoses are all attached.
    Common problem........yamaha do not put clamps on them & they loosen up over time.
    Take the airbox top off & you will see them.
    Got some pics some where will post up if I get a chance.
    If that is not the problem, then I would run a compression test.

  3. #3
    volltrex's Avatar
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    Here you go.....




  4. #4
    lockpwc's Avatar
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    I would try a new set of plugs. Make sure your air filter is not full of oil.

  5. #5
    volltrex's Avatar
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    Quote Originally Posted by lockpwc View Post
    I would try a new set of plugs. Make sure your air filter is not full of oil.
    Yeah should have mentioned that........if the plugs have been in a while then it is always good to change them as a matter of course when trying to diagnose poor running issues. The air filter is also worth checking, although if contaminated it would usually knock a fair bit of the top speed.

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