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Dark sparkplugs

Discussion in 'XJ Technical Chat' started by Stroker, Jun 8, 2018.

  1. Stroker

    Stroker New Member

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    Hi.
    I just installed 4 new plugs and after just 10 minutes driving its like this?
    Oil or too rich? 20180608_234224.jpg
     
    Stroker, Jun 8, 2018
    #1
    Jetfixer likes this.
  2. Jetfixer

    Jetfixer Well-Known Member

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    Rich ....it is not oily it is dry and sooty . You need to clean plug and adjust mixture.
     
    Jetfixer, Jun 8, 2018
    #2
    rocs82650 and Stroker like this.
  3. k-moe

    k-moe Pie, Bacon, Bourbon. Moderator Premium Member

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    Was that ten minutes of riding after the bike had fully warmed up?
     
    k-moe, Jun 8, 2018
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    kerriskandiesinc likes this.
  4. kerriskandiesinc

    kerriskandiesinc Active Member

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    Ride it a bit more, off the choke, thats the only way to do a proper plug chop, or as near as dammit!!
     
    kerriskandiesinc, Jun 8, 2018
    #4
  5. tabaka45

    tabaka45 Well-Known Member

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    Wicked rich! Assuming the bike and carbs are stock, you need to close the pilot screws to lean it some. It will help if you can get a colortune plug to use. If not, set the pilot screws at about 1 1/2 open and install new plugs and then take a 15-20 mile ride and pull the plugs and see what they look like. You are looking for a light tan or gray color on the porcelain. If it is white open the pilot screw about the width of a dime, ride again and re-check the plugs. Continue this process until you get the light tan or gray plugs. It took me a couple of weeks to reach the right setting on each plugs. If you have a colortune plug then start by closing the pilot screws until you see white (lean) and then open until the white disappears. Then install the new plugs and start the ride and check process.
     
    tabaka45, Jun 9, 2018
    #5
  6. k-moe

    k-moe Pie, Bacon, Bourbon. Moderator Premium Member

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    That'd make him wicked-lean. I'm sure you meant to type 2 1/2.
     
    k-moe, Jun 9, 2018
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  7. k-moe

    k-moe Pie, Bacon, Bourbon. Moderator Premium Member

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    It would also help to know which model of XJ you have. Some of the earlier models have coarse-thread mixture screws, so the baseline setting is a tad different.
     
    k-moe, Jun 9, 2018
    #7
  8. tabaka45

    tabaka45 Well-Known Member

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    Without a colortune plug that’s where I would start the adjustment process with new plugs. It’s just easy riding until the plugs are dialed in.

    When I used a colortune plug I got rid of the white flame somewhere around 1 1/2, so that’s why I mentioned that as a starting point. It took me 6-7 easy rides over a couple of weeks to get the nice tan plugs.
     
    tabaka45, Jun 10, 2018
    #8

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