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Fuel/Air mixture screw location?

Discussion in 'XJ Technical Chat' started by SnoSheriff, Jul 27, 2006.

  1. SnoSheriff

    SnoSheriff Site Owner Staff Member Administrator

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    I haven’t had the need to work on my carbs yet. I’m thinking on getting color tune plug to check/adjust my fuel mixture as I can tell my cylinder #1 is running colder then the rest. I did this by placing my hand on the exhaust pipe as the bike was warming up. Before I tackle the job I’m wondering if someone could describe (picture would help) where the carb mixture screw is located :oops:? I’m guessing each carb has it’s own mixture screw?
     
    SnoSheriff, Jul 27, 2006
    #1
  2. hessenr00ts

    hessenr00ts Member

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    As requested! :D

    Left and right side, just for details sake.

    [​IMG]


    [​IMG]
     
    hessenr00ts, Jul 27, 2006
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  3. SnoSheriff

    SnoSheriff Site Owner Staff Member Administrator

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    NICE, thank you :mrgreen:. Is that a Phillips screw? How do you guys get in there on the 2nd and 3rd cylinder? Looks like it may be a bit tight.
     
    SnoSheriff, Jul 27, 2006
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  4. hessenr00ts

    hessenr00ts Member

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    It's a thin flat head screw, nothing crazy.

    I've not done it myself but for the middle screws I'd use one of those 90degree angle attachments on a long socket handle.
     
    hessenr00ts, Jul 27, 2006
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  5. jdrich48

    jdrich48 Member

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    They make a special tool for it, but I find it just as easy to remove the tank bolt and take a short 2X4 and prop up the rear of the tank and use a small pocket screwdriver.
     
    jdrich48, Jul 27, 2006
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  6. jdrich48

    jdrich48 Member

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    Also if they have never been adjusted they may have the brass plugs still in place.
     
    jdrich48, Jul 27, 2006
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  7. SnoSheriff

    SnoSheriff Site Owner Staff Member Administrator

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    If they do have the brass plugs, do they just pop out somehow?
     
    SnoSheriff, Jul 27, 2006
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  8. jdrich48

    jdrich48 Member

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    You will have to carefully drill a small 1/8" hole in the center, then take a sheet metal screw that fits snug in the hole and wiggle and pull with a pair of pliers. The plug is about 1/8" thick drill carefully.
     
    jdrich48, Jul 27, 2006
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  9. Hvnbnd

    Hvnbnd Active Member

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    I've included a schematic of a carb but it looks like everyone else pretty well showed you.
    I drilled the plug with a 3/16" drill bit but be careful as everyone else said because you can go thru pretty fast and damage the screw head.
    The screw head is small flat blade and I've found for the #2 & #3 carbs that a double ended bit for a reversable screwdriver fits in there nicely
    one side has a straight blade and the other is a phillips.
    The color tune is a good idea and if you dont get the pretty bunsen burner blue in the window but only see spark then that cylinder is rich or has no gas. if the plug comes out wet then it's rich and if it comes out dry and clean it's lean.
    Mike
     
    Hvnbnd, Jul 27, 2006
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