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Spark plug rich or lean?

Discussion in 'XJ Technical Chat' started by Jose Zambrana, May 10, 2020.

  1. Jose Zambrana

    Jose Zambrana Member

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    Hi there. I have a 650 Seca that sometimes makes a popping noise from one of the carbs which I think comes from #4. I’m running pods with all the original jet sizes. She runs good and have enough pull for my needs. She idles a bit rough between 1000-1400. I have cleaned the carbs with an ultrasonic cleaner and changed all the throttle shafts and got new intake boots. I’m thinking the popping noise comes from a lean condition in one of the carbs. I have checked the sparks and attached photos for ur input. As per my interpretation of the Haynes manual photos, #1 is rich, #2 is right on spot and #3 and #4 are lean. What do you think? Ur input will be greatly appreciated.
     

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    Jose Zambrana, May 10, 2020
    #1
  2. XJ550H

    XJ550H Well-Known Member Premium Member

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    have you synced the carbs?
     
    XJ550H, May 10, 2020
    #2
  3. Jose Zambrana

    Jose Zambrana Member

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    Yes. They are sync.
     
    Jose Zambrana, May 10, 2020
    #3
  4. Polock

    Polock Well-Known Member

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    1 is way rich
    2 is rich
    3 looks lean
    4 is lean
    2 is the closest
     
    Polock, May 11, 2020
    #4
    raskal likes this.
  5. Jose Zambrana

    Jose Zambrana Member

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    Thank you
     
    Jose Zambrana, May 11, 2020
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