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Spark or fuel??

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  • Spark or fuel??

    Bike is running good at higher RPMs, at least I do not feel the same miss I am getting at lower RPMs. Definitely notice it at idle although it seems intermitent at idle.

    Spark plugs for 2,3, and 4 come out looking new, not tan or anything, white tips and clean electrode. No 1, comes out looking like a coal plant. So I turned my mixture screw in a half a turn, and cleaned the plug up. Took about a 8 mile ride leeting the bike run done in low RPM, but not much idle time. No 1 now looks good except a little soot around the thread ring.

    Next ride, about 12 miles and some stop lights. Notice the missing again, back to number 1 looking like a coal mine, 2,3, and 4 still clean. Also, I switched plugs between 1 and 2 to be sure it was not a bad plug. Can I switch plug wires between 1 and 4? Will they both still spark at the right time? I'm thinking that will answer if it is electrical or carburation. It is hard for me to think that one carb would need that much less idle screw than the other three.
    Life is what happens while your planning everything else!

    When your work speaks for itself, don't interrupt.

    81 XS1100 Special - Humpty Dumpty
    80 XS1100 Special - Project Resurrection


    Previously owned
    93 GSX600F
    80 XS1100 Special - Ruby
    81 XS1100 Special
    81 CB750 C
    80 CB750 C
    78 XS750

  • #2
    Yes, you can switch 1+4 around and it will fire correctly. On one of my 79's, one idle screw is turned in about 1 1/2 turns further than the rest for it to run properly. It's not an uncommon thing.
    2H7 (79) owned since '89
    3H3 owned since '06

    "If it ain't broke, modify it"

    Comment


    • #3
      Thansk Phil, turn it down another half a turn and took about a twelve mile ride with some decent stops for cross roads and lights on the way. Plug looks cleaner for sure.
      Life is what happens while your planning everything else!

      When your work speaks for itself, don't interrupt.

      81 XS1100 Special - Humpty Dumpty
      80 XS1100 Special - Project Resurrection


      Previously owned
      93 GSX600F
      80 XS1100 Special - Ruby
      81 XS1100 Special
      81 CB750 C
      80 CB750 C
      78 XS750

      Comment


      • #4
        Glad it was that simple of a fix.
        2H7 (79) owned since '89
        3H3 owned since '06

        "If it ain't broke, modify it"

        Comment

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