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  1. #1
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    Aug 2004
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    Tangerine, FL
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    2004 Yamaha 250 OX66: Rough Idle

    When having the motor in forward/reverse and minimal gas on hot foot, it idles really rough and dies once in a while. Once you apply more gas, it runs good. Also, when putting boat on trailer, the motor doesn't power the boat on the trailer very well. Anyone know the problem?
    04' 210 Blazer w/ 250 Yamaha OX66

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  3. Member
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    Jul 2009
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    Flowery Branch
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    #2

    Re: 2004 Yamaha 250 OX66: Rough Idle (BassHog007)

    Could be several things... I have a 2001 225 ox66 and had the same issue. I cleaned the o2 sensor, replaced the vst fuil filter and the low pressure fule pumps which seemed to fix my problem. You can do the work yourself and order the parts on wholesalemarine.com which will save you a lot of money. hope this helps.

  4. Moderator 21XDC's Avatar
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    Sep 2004
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    Westland Michigan
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    42,594
    #3

    Re: 2004 Yamaha 250 OX66: Rough Idle (BassHog007)

    How many rpms does it idle at in neutral? Might just need turned up a bit.

  5. Member utfisherman's Avatar
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    Jul 2005
    Location
    Gallatin, TN
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    512
    #4

    Re: 2004 Yamaha 250 OX66: Rough Idle (BassHog007)

    Set idle speed to 750 rpm in neutral. Make sure all throttle bodies open together (no cost)
    If not better-
    Check TPS voltage and adjust if needed. (no cost)
    If not better-
    Check all 3 low pressure fuel pumps. Replace if leaking ($140 for parts off the internet and you can easily do it yourself)
    Larry McClure
    President, Reel Men of God
    http://www.reelmenofgod.com


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