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Check out this plug reading. Im confused, please help.

Discussion in 'XJ Technical Chat' started by Heyitsme, Apr 1, 2014.

  1. Heyitsme

    Heyitsme Member

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    XJ700, valves in spec, stock hitachi carbs. Just cleaned again, although they didn't need it. Figured I would check anyways. Didn't change anything from last year( meaning adjustment screws, I didn't break the carb rack either. I put in new plugs today(good spark from each plug). So I fired the bike up, and only 2 cylinders are firing it looks like.. I didn't even have the mufflers on and 2 of the plugs were black. Black smoke out of the exhaust. But number 2 and 3 cylinders weren't even firing..

    Help?

    [​IMG]
     
    Heyitsme, Apr 1, 2014
    #1
  2. quebecois59

    quebecois59 Well-Known Member

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    Number 2 and 3 not firing points to a bad coil.

    NUmber 1 and 4 are way too rich, you will habe to clean these fooled plugs before you go any further. I personaly use carb cleaner and a old tooth brush.

    Is your air filter obstructed (mice nest, or whaterver)?
     
    quebecois59, Apr 1, 2014
    #2
  3. Heyitsme

    Heyitsme Member

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    Yea, I wire brushed the plugs.

    Filter/airbox has been thoroughly cleaned.

    I have blue spark at each coil/spark plug.
     
    Heyitsme, Apr 1, 2014
    #3
  4. mlew

    mlew Well-Known Member

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    You have carb problems. Go ahead and take them out and do a through cleaning and carb sync.
     
    mlew, Apr 1, 2014
    #4
  5. tskaz

    tskaz Active Member

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    I vote for a re-sync starting on the bench. The fact that you pulled the carbs off warrants it.
    Even if you do nothing but pull the rack off and reinstall it, it's enough to muck up the sync you had at the start.
     
    tskaz, Apr 1, 2014
    #5
  6. RickCoMatic

    RickCoMatic Well-Known Member

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    That 2-Hole Plug looks like its not getting ANY Fuel to it.

    The others indicate you need to do the Rack.

    Since the 2-Hole looks so clean, ... put the Petc0ck on PRIme.
    Set the Bike on the Work Stand.
    Back-out the Bowl Drain Screw and see it there's any Gas in the Bowl.

    Face it, ...

    You have to Pull the Rack and do a Full Monte cleaning.
     
    RickCoMatic, Apr 2, 2014
    #6

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