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Cant get bike to idle

Discussion in 'XJ Modifications' started by adam_prost, May 31, 2011.

  1. adam_prost

    adam_prost New Member

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    On my 82 xj650 i can not get the bike to idle correctly. It has a stock air box but now has open headers. the bike starts and runs great and by looking at the plugs they are a nice tan color. I warm the bike up and turn the idle screw till it sits at about 900rpm and the bike runs good, but as soon as i toutch the throttle the bike takes a while to come back down rpms. as soon as i back the idle screw till it wont idle the problems goes away. i put all new intake boots on it and still have the problem. not sure where to go from here. :evil:
     
    adam_prost, May 31, 2011
    #1
  2. JeffK

    JeffK Well-Known Member

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    "throttle the bike takes a while to come back down rpms"

    lean....you need to richen it up.

    jeff
     
    JeffK, Jun 1, 2011
    #2
  3. BillB

    BillB Active Member

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    Did you pull the spark plugs to see how everything is burning in the cylinders?
    Black sooty plugs= too much gas
    White chalky plugs= not enough

    Take short trips for about a half mile so you can get the plugs to show color.
    Then pull the plug to adjust the mix to a dark brown color slightly black.
     
    BillB, Jun 1, 2011
    #3
  4. bigfitz52

    bigfitz52 Well-Known Member Premium Member

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    -VALVE CLEARANCES in spec.

    -Float levels (set using fuel and clear tubing.)

    -Running vacuum sync, YICS blocked.

    Then and only then do we worry about tweaking mixtures. Hanging idle is generally a sync issue, which can't be dealt with effectively until the valves are in spec; it could also be float-level related. Or all three combined.
     
    bigfitz52, Jun 1, 2011
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