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  • #1

    Idle changes?

    Greetings all!
    I was wondering if anyone else had this phenonema? With my 79 xs1100f on the sidestand...I start the motor. As I lift the bike up into a riding position...the R.P.M.s change quite a bit (increasing). I have noticed that the P.O. had installed what appears to be "back flow" preventors (clear, plastic diaphram looking things).
    While the bike runs strong and they don't seem to affect performance..I had considered removing them one day.
    Some days you're the pigeon..and some days you're the statue/

    1979 XS1100f
    Saddle bags, small wind screen and non-original rear shocks. Otherwise..completely stock.
    Tags: None
  • #2
    Does the idle change at all if you turn the handlebars lock to lock?
    Nathan
    KD9ARL

    μολὼν λαβέ

    1978 XS1100E
    K&N Filter
    #45 pilot Jet, #137.5 Main Jet
    OEM Exhaust
    ATK Fork Brace
    LED Dash lights
    Ammeter, Oil Pressure, Oil Temp, and Volt Meters
    Green Monster Coils
    SS Brake Lines
    Vision 550 Auto Tensioner

    In any moment of decision the best thing you can do is the right thing, the next best thing is the wrong thing, and the worst thing you can do is nothing.

    Theodore Roosevelt

    Comment

    • #3
      Idle changes (reply)

      No. The idle stays consistent no matter which direction I turn the bars.
      Some days you're the pigeon..and some days you're the statue/

      1979 XS1100f
      Saddle bags, small wind screen and non-original rear shocks. Otherwise..completely stock.

      Comment

      • #4
        Originally posted by Welsh1100 View Post
        Greetings all!
        I was wondering if anyone else had this phenonema? With my 79 xs1100f on the sidestand...I start the motor. As I lift the bike up into a riding position...the R.P.M.s change quite a bit (increasing). I have noticed that the P.O. had installed what appears to be "back flow" preventors (clear, plastic diaphram looking things).
        While the bike runs strong and they don't seem to affect performance..I had considered removing them one day.

        I am thinking they might be fuel filters.

        Do you still have the octy or was it removed?

        If you still have the octy I am thinking the throttle cable is getting a little hung up, like natemeon suggested.

        I removed my octy and if I am low on fuel my rpms do change a little when I pull the bike off the side stand.

        In either case the filters might be getting clogged and you might want to change them out.
        Four wheels move your body, two wheels move your soul.

        ATGATT, It could save your life!

        1980 XS 1100SG
        Dyna 3 Ohm Hi Output Coils
        Pod Filters
        DynoJet Kit
        T.C.'s Fuse Block
        Slip Streamer Turbo Windshield
        Custom Tank and Side Cover Decals
        V-Max Auto CCT

        Comment

        • #5
          If possible some pictures of the "back flow presenters" would be very helpful!
          Nathan
          KD9ARL

          μολὼν λαβέ

          1978 XS1100E
          K&N Filter
          #45 pilot Jet, #137.5 Main Jet
          OEM Exhaust
          ATK Fork Brace
          LED Dash lights
          Ammeter, Oil Pressure, Oil Temp, and Volt Meters
          Green Monster Coils
          SS Brake Lines
          Vision 550 Auto Tensioner

          In any moment of decision the best thing you can do is the right thing, the next best thing is the wrong thing, and the worst thing you can do is nothing.

          Theodore Roosevelt

          Comment

          • #6
            Originally posted by MrOzz View Post
            Do you still have the octy or was it removed?
            It's a Standard - no Octy.

            Do you have a full tank of fuel? IIRC, on the '79, the two sets of carbs do not share fuel between the petcocks. If the Right petcock is not getting fuel while on the sidestand, the carbs connected to that petcock won't be firing. Once you stand up the bike and level out the fuel, they can fire again.

            Try disconnecting the fuel line from the right side petcock while the bike is on the sidestand (and running) and see if fuel comes out.

            It might also be a sticky float, and once you straighten the bike up, the float can... float... again. I had an opposite issue a while back, and I had to make sure that I shut the bike off while it was still upright, or a float would stick and not allow the valve to close, dripping a bit of fuel into the airbox on occasion.
            1980 XS850SG - Sold
            1981 XS1100LH Midnight Special (Sold) - purchased 9/29/08
            Fully Vetterized and Dynojet Kit added, Heated Grips, Truck-Lite LED headlight, Accel Coils, Irridium plugs, TKAT Fork Brace, XS850LH Final Drive & Black SS Brake lines from Chacal.
            Here's my web page devoted to my bike! XS/XJ User's Manuals there, and the XJ1100 Service Manual and both XS1100 Service manuals (free download!).

            Whether you think you can, or you think you cannot - You're right.
            -H. Ford

            Comment

            • #7
              Originally posted by CatatonicBug View Post
              It's a Standard - no Octy.
              I did not know this. I learned something new today, Thanks Catatonic.
              Four wheels move your body, two wheels move your soul.

              ATGATT, It could save your life!

              1980 XS 1100SG
              Dyna 3 Ohm Hi Output Coils
              Pod Filters
              DynoJet Kit
              T.C.'s Fuse Block
              Slip Streamer Turbo Windshield
              Custom Tank and Side Cover Decals
              V-Max Auto CCT

              Comment

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