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rpms wont go down!

Discussion in 'XJ Technical Chat' started by nissinator, Sep 13, 2012.

  1. nissinator

    nissinator New Member

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    i have a 1980 maxim 650 on first startup it idles just fine (just cleaned carbs) i drive it for a while then come back and click it into neutral and release the clutch and the rpms just keep going higher and higher...any ideas?
     
    nissinator, Sep 13, 2012
    #1
  2. mlew

    mlew Well-Known Member

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    Have you checked for vacuum leaks at the carb to head boots and throttle shaft seals? Are the carb sync ports caps dry or cracked?
     
    mlew, Sep 13, 2012
    #2
  3. tabaka45

    tabaka45 Well-Known Member

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    Did you initially set the idle after the engine was fully warmed up? Try riding the bike a couple of miles and then adjusting the idle with the idle screw.
     
    tabaka45, Sep 13, 2012
    #3
  4. bigfitz52

    bigfitz52 Well-Known Member Premium Member

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    Sure.

    Verify your valve clearances;

    precisely wet-set the float levels;

    and do a running vacuum sync.

    You've only begun.
     
    bigfitz52, Sep 13, 2012
    #4
  5. mook1al

    mook1al Member

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    You might also check that the throttle cable is moving freely and not binding or routed incorrectly.
     
    mook1al, Sep 13, 2012
    #5
  6. MrPhys

    MrPhys Member

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    No frigg'n joke
     
    MrPhys, Sep 13, 2012
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  7. MercuryMan

    MercuryMan Active Member

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    At least you know your compression is good! Vacuum leak....
     
    MercuryMan, Sep 13, 2012
    #7
  8. aaron_acrusto

    aaron_acrusto Member

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    Close the choke?
     
    aaron_acrusto, Sep 14, 2012
    #8

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