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Idle problem

Discussion in 'Hangout Lounge' started by dmlyster, Sep 1, 2012.

  1. dmlyster

    dmlyster Member

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    83 XJ 750 K. Gas tank a mess when I got it. Cleaned up well. Starts fine with choke and idles at spec (1000 rpm). After riding for a few miles the idle increases.

    When hot and at idle I now get 2500 rpm. Will not resume spec idle until shut down and cooled. Anyone have any ideas as to cause?
     
    dmlyster, Sep 1, 2012
    #1
  2. mlew

    mlew Well-Known Member

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    Valve adjustmants need to be checked and in spec first.
    Then check carbs;
    Float levels correct?
    Any vacuum leaks? Throttle shaft seals and carb boots are always a problem
    Carbs sync properly?
    Has a compression test been done to ensure the motor is healthy?

    Your symptons point to a possible vacuum leak.
     
    mlew, Sep 1, 2012
    #2
  3. KrS14

    KrS14 Active Member

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    Set the idle when fully hot, that's why there's choke when it's cold.
     
    KrS14, Sep 3, 2012
    #3
  4. tabaka45

    tabaka45 Well-Known Member

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    agree. from experience.
     
    tabaka45, Sep 8, 2012
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  5. dmlyster

    dmlyster Member

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    Thanks All!! Setting the idle with engine hot seems to have solved my problem. I still need to work on carb valve adjustment but will hold that project for the winter. Thanks again for all your comments.
     
    dmlyster, Sep 14, 2012
    #5

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