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#3 plug running rich

Discussion in 'XJ Technical Chat' started by redcorfe, Jul 5, 2008.

  1. redcorfe

    redcorfe Member

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    Greeting from the UK,

    We are in the middle of our summer so its peeing down :roll:

    Had just put the carbs back after cleaning and new jets / gaskets etc
    Have the bike running quite well - starts and idles nicely - synch / colortune first - then slight adjustment so that 1,2,4 ( left to right as you sit on )are 95% there, but plug 3 will not adjust on colortune ( constant yellowish colour ) and no matter how far in I put the mixture screw in it is staying rich.
    I believe looking at out threads I am getting to much fuel through - I have checked to see if the float is sticking or if the level is incorrect but cannot find a problem there.
    One other thing, previous owner has the petcock as a gravity feed ( not using the vacuum, just a straight on / off )

    Any ideas were I should investigate further ?

    I have spent so much time on this I might have to let a mechanic have a go, :( if you XJ experts cannot come up with an answer.

    Ian
     
    redcorfe, Jul 5, 2008
    #1
  2. bstig60

    bstig60 Member

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    Check your spark on that cylinder and make sure it is strong and blue in color. If you have a weak spark, that might account for the running rich problem. Had a similar problem on my Virago.
     
    bstig60, Jul 5, 2008
    #2
  3. wizard

    wizard Active Member

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    hi redcorf, you might want to check my thread "plugs" in xj chat.
    good luck Wiz.
     
    wizard, Jul 5, 2008
    #3
  4. RickCoMatic

    RickCoMatic Well-Known Member

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    You can investigate a few things before handing-off the work to someone else.

    First, check to see that the tiny O-ring at the bottom of the Pilot Mixture Screw isn't tilted sideways and is in fact seated correctly at the bottom of the chamber.

    Every so often, as the Pilot Screw is being replaces the O-ring and its Flat Washer get spun-around ans they mysteriously exchange places.
    Do you have the correct size Pilot Fuel Jet in the bottom side?

    Are the Main AIR Jet and the Pilot AIR Jet in the correct position.
    If you removed the AIR Jets (from beneath the Diaphragm Rubber) they are easily confused.
    (Their values are misprinted in the Haynes Manual).

    Swap the Pilot Mixture Screw from the offending Cylinder with one of the ones that are capable of being adjusted correctly and see if that helps your situation.
     
    RickCoMatic, Jul 5, 2008
    #4
  5. redcorfe

    redcorfe Member

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    Cheers guys,

    I will have another go this week, but off to see Neil Young tomorrow :lol:
     
    redcorfe, Jul 5, 2008
    #5

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