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  • #1

    3 good, 1 black

    Spark plugs that is. 1,3,4 perfect tan color. #2 for some reason is black. Even when I had the idle mix screw all the way in. Jets, needles, float height all the same between all 4 carbs. Carbs merc stick synced.Only thing different on #2 is the vacuum advance. Could it cause #2 to be rich
    Grassy Asss Amigos
    "Beware of any man that owns a pig farm"
    "Hence the meaning of the Saying,.. As greedy as a pig"
    79 XS1100 modified standard
    Chain Drive, Monoshock,extendend hand built swingarm, 200 rear
    pod filters,150 mains,45 pilots
    straight pipe 4-2 exhaust
    new to me 05 Kawasaki zxr12r man does she fly
    Owned 83 Honda V65 Magna
    Owned 02 Vstar 650 classic
    owned 85 Honda Shadow VT 700C
    Tags: None
  • #2
    audijunky:

    Double check your spark, it may be that #2 is firing only sometimes. Even though wasted spark design means that two plugs fire at the same time, a bad plug lead, a bad plug may cause you a problem. Some have recommended cuting off a quarter inch of the spark lead and inserting it back in the cap often solves this problem. It did for me.

    Comment

    • #3
      Switch the plug wires from 2 to 3 and vise versa and see what that does. If 3 starts misfiring, and 2 straightens out, then the plug wire or cap may be to blame.

      Comment

      • #4
        When I did the pick up coil wire fix, I wired them backwards, and had to switch the the plug wires around so it would run. So I am pretty sure it is not the ignition circuit. However I do remember when I first got this beast running I was having problems with the #3 cylinder not firing all the time. Which I now believe the old #3 plug wire is connected to #2. So I guess it could be the plug wires. I'll do some searching now for replacement coils and wires .
        thanks
        "Beware of any man that owns a pig farm"
        "Hence the meaning of the Saying,.. As greedy as a pig"
        79 XS1100 modified standard
        Chain Drive, Monoshock,extendend hand built swingarm, 200 rear
        pod filters,150 mains,45 pilots
        straight pipe 4-2 exhaust
        new to me 05 Kawasaki zxr12r man does she fly
        Owned 83 Honda V65 Magna
        Owned 02 Vstar 650 classic
        owned 85 Honda Shadow VT 700C

        Comment

        • #5
          pilot screw adjustment

          Black is a sign of incomplete combustion . Is possible in both too lean and too rich conditions . With pilot screw in all the way some fuel is not burning and leaves a coating on the plug . Any other symptoms ? Colortune is my fav tool for this setting . But the "by ear" method is popular amoung some . Find the spot where the idle speeds up when set to 700-800 . There is a post on this

          http://www.xs11.com/forum/showthread...threadid=13124
          XJ1100K
          Avon rubber
          MikesXS black coils
          Iridium plugs w/ 1k caps
          MikesXS front master
          Paragon SS brake lines (unlinked)
          Loud Horns (Stebel/Fiamm)
          Progressive fork springs
          CIBIE headlight reflector
          YICS Eliminator

          Comment

          • #6
            pilot screw=idle mix screw ??
            "Beware of any man that owns a pig farm"
            "Hence the meaning of the Saying,.. As greedy as a pig"
            79 XS1100 modified standard
            Chain Drive, Monoshock,extendend hand built swingarm, 200 rear
            pod filters,150 mains,45 pilots
            straight pipe 4-2 exhaust
            new to me 05 Kawasaki zxr12r man does she fly
            Owned 83 Honda V65 Magna
            Owned 02 Vstar 650 classic
            owned 85 Honda Shadow VT 700C

            Comment

            • #7
              YES

              Yes . Top of carb in a recessed hole . Sometimes has rubber plug . If first time may have metal cap to be CAREFULLY drilled with a small hole ,fitted with a screw and pryed off . There are posts on this in detail
              XJ1100K
              Avon rubber
              MikesXS black coils
              Iridium plugs w/ 1k caps
              MikesXS front master
              Paragon SS brake lines (unlinked)
              Loud Horns (Stebel/Fiamm)
              Progressive fork springs
              CIBIE headlight reflector
              YICS Eliminator

              Comment

              • #8
                Maybe on the newer carbs. I have a 78. the screws I speak of are on top of the carb in the front, and have a tiny grooves in the head all the way around to allow for finger adjustment. I have read on here that they allow fuel in to mix with the air. The way I figured a black sooty plug means its running rich. So basically #2 is set up to idle lean(because the screw was all the way in, choking off the fuel), yet the plug is black. I need to check the plug wire, other than that the only difference is the advance vacuum. everything else set the same on all the carbs except for my air/fuel mix idle screw on #2
                "Beware of any man that owns a pig farm"
                "Hence the meaning of the Saying,.. As greedy as a pig"
                79 XS1100 modified standard
                Chain Drive, Monoshock,extendend hand built swingarm, 200 rear
                pod filters,150 mains,45 pilots
                straight pipe 4-2 exhaust
                new to me 05 Kawasaki zxr12r man does she fly
                Owned 83 Honda V65 Magna
                Owned 02 Vstar 650 classic
                owned 85 Honda Shadow VT 700C

                Comment

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