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fourth cylinder running colder than the other three

Discussion in 'XJ Technical Chat' started by rdbhere2, Jun 13, 2009.

  1. rdbhere2

    rdbhere2 Member

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    I have spark and fuel. My fourth cylinder is running cooler than the other three, any ideas?
     
    rdbhere2, Jun 13, 2009
    #1
  2. TIMEtoRIDE

    TIMEtoRIDE Active Member

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    Sure.
    You tuned it up correctly, then a piece of crud dislodged in #4 and now you are rich.

    re-tune, , , re-set. see what happens.
     
    TIMEtoRIDE, Jun 13, 2009
    #2
  3. MN-Maxims

    MN-Maxims St. Paul Minnesota

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    Sounds like pilot circuit on #4 carb has something in it. Check to see if it fires with propane in the vacuum port..

    MN
     
    MN-Maxims, Jun 13, 2009
    #3
  4. redcorfe

    redcorfe Member

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    How spooky is this !!! I was messing about with a mates infered heat gun this weekend, and although the bike is running fine, if a little lean, my 4th pipe was cooler than the others.

    Checked the fuel level and that was Ok
    Will change the plug incase the problem is that.

    Any other ideas
     
    redcorfe, Jun 14, 2009
    #4
  5. rdbhere2

    rdbhere2 Member

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    The only reason i know the fourth is pipe is running cool is because the white header wrap on the pipe is turning tan on the first three pipes and is still white on the forth pipe. The fourth plug is a light tan grey color and when its cold outside i have to give extra attention to the fourth carb with the starting fluid. The bike sputters from the fourth carb while idling but when i give it gas it's ok. All the plugs are new. Any ideas on it?
     
    rdbhere2, Jun 14, 2009
    #5
  6. DianCecht

    DianCecht Member

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    I agree with MN Maxims, check your pilot circuit... I had this exact same thing happen at the beginning of this season.
     
    DianCecht, Jun 14, 2009
    #6

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