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New Startup Running Problems. PLEASE HELP!!

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  • #1

    New Startup Running Problems. PLEASE HELP!!

    Ok so I got the bike started after new battery, plugs, carb rebuild, etc... at first the bike would only fun at full choke, I expected that after sitting for a few years... after idleing for a while I was able to turn choke off and adjust the idle. It now will idle about 900-1100 rpm...

    I made a carb synchronizer with tubing, stake, and 2 cycle brake fluid and when I hook it up to 1 and 2, it moves about 3/4 inch but when I adjust the idle mixture screw, the level doesn't really change...

    It doesn't really respond to any adjusting I try. I am not a motorcycle mechanic by any means but I do like doing everything I can myself. I have one of XS11 members coming over tomorrow evening to take a look but I would still like to be as informed as possible. Any thoughts, ideas, comments are much appreciated!

    Thanks everyone in advance,
    Josh
    1981 XS1100 Special

    "A well regulated Militia, being necessary to the security of a free State, the right of the people to keep and bear Arms, shall not be infringed." 2nd Amendment
    Tags: None
  • #2
    i wonder if maybe the screw tip got broke off in the little hole?
    Jeff
    77 XS750 2D completely stock
    79 SF XS1100 "Picky" stock with harley mufflers

    Comment

    • #3
      Are you turning the idle fuel mix screws on the carb bell, or are you turning the sync screws between the butterflies?

      Also, when sending you start with 3 & 4 then do 1 & 2 and then (i guess it really doesn't matter which pair you do first) and then sync the 2 pairs to each other. #3 carb is status and does not adjust so everything must be adjusted to it.
      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

      • #4
        Nate has the right idea, sounds like you need to look at the screws between the carb bodies in front by the head to synch with. You were probably using the mixture screws, which will effect it eventually but not correctly.

        Synching the carbs is really adjusting how open the throttle plate (butterfly) is on each carb to create equal vacuum draw from all four cylinders. No 3 throttle plate is adjusted by the main idle screw only. The way the linkage works is that the synch screw between 3 and 4 adjust the throttle plate of 4 in relation to no 3. So you use that screw to make 3 and 4 match. The screw between 1 and 2 adjust no 1 throttle plate position in relation to no 2 throttle plate. So you use that screw to get 1 and 2 to match. Then the screw between 2 and 3 adjust the position of no 2 throttle plate in relation to no 3. So that brings 2 (and no 1 right along with it) to match no 3 which may or may not already match no 4.

        You could actually synch 1 to 2, and then 2 to 3, and finally 4 to 3. Or even start by synching 2 to 3, and then 1 to 2 and then 4 to 3 and should be roughly the same end result. Honestly though, I would recommend synching the pairs on left and right sides first then bringing the pairs together with the screw between 2 and 3.

        Of course, no matter what sequence you use, changing one will effect the others, its just a matter of how much it effects them. So you should always go back through them once you think all is correct. Or if you have one of the fancy setups that measure all four at once, you can see the results instantly.
        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

        • #5
          Well that helps out alot. I was turning the idle mixture screw and not the butterfly adjustment. Now that I know that little bit of info I think I will try it again.
          1981 XS1100 Special

          "A well regulated Militia, being necessary to the security of a free State, the right of the people to keep and bear Arms, shall not be infringed." 2nd Amendment

          Comment

          • #6
            Update!!! Help!!!

            Ok so after running it for a while, very roughly I might add because I didn't get it synchronized yet, I discovered I was running way too rich, the exhaust smelled heavy of gas and was burning my eyes and throat. I rejetted the carbs back to stock, 110 mains and 42.5 pilots (i'm running a 4-1 kirker and pod filters).

            Now I can get it started, running just a little lean, not much, but I can't get it to idle for any length of time. A few times, after reving the motor with the throttle, it reved itself up to about 5k rpm so fast that I hit the kill switch. I have the mixture screws set to 1-1/2 turns out and I've tried messin with the idle knob under the carbs, nothing seems to work and now I'm lost and clueless.

            I would like to avoid paying someone to fix it but my motorcycle mechanic skills are non-existent and I know it's hard to diagnose a bike through the forums...I might be forced to pay someone to fix it. Any help, once again, is much appreciated. Thanks.
            1981 XS1100 Special

            "A well regulated Militia, being necessary to the security of a free State, the right of the people to keep and bear Arms, shall not be infringed." 2nd Amendment

            Comment

            • #7
              Open the idle mix screws up to 2.5-3 turns and try again.

              Lean mix often causes a hanging idle.
              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

              • #8
                so will not being synced.
                Greg

                Everybody is a genius. But if you judge a fish by its ability to climb a tree, it will live its whole life believing that it is stupid.”

                ― Albert Einstein

                80 SG Ol' Okie;79 engine & carbs w/pods, 45 pilots, 140 mains, Custom Mac 4 into 2 exhaust, ACCT,XS850 final drive,110/90/19 front tire,TKat fork brace, XS750 140 MPH speedometer, Vetter IV fairing, aftermarket hard bags and trunk, LG high back seat, XJ rear shocks.

                The list changes.

                Comment

                • #9
                  That too, both cause it, but you need to try to get the idle down before you can sync.
                  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

                  • #10
                    Does a lean mix also cause little backfiring through the pod filters?
                    1981 XS1100 Special

                    "A well regulated Militia, being necessary to the security of a free State, the right of the people to keep and bear Arms, shall not be infringed." 2nd Amendment

                    Comment

                    • #11
                      Sync does too.

                      Have you adjusted valves?
                      Greg

                      Everybody is a genius. But if you judge a fish by its ability to climb a tree, it will live its whole life believing that it is stupid.”

                      ― Albert Einstein

                      80 SG Ol' Okie;79 engine & carbs w/pods, 45 pilots, 140 mains, Custom Mac 4 into 2 exhaust, ACCT,XS850 final drive,110/90/19 front tire,TKat fork brace, XS750 140 MPH speedometer, Vetter IV fairing, aftermarket hard bags and trunk, LG high back seat, XJ rear shocks.

                      The list changes.

                      Comment

                      • #12
                        No how do you do that?
                        1981 XS1100 Special

                        "A well regulated Militia, being necessary to the security of a free State, the right of the people to keep and bear Arms, shall not be infringed." 2nd Amendment

                        Comment

                        • #13
                          Update!!!

                          Ok so after much tinkering, IT'S RUNNING!!! I took it on it's first road test today, granted it was only a few miles but I took it through town and on the highway, took it through the gears and it runs pretty good. It takes a few mins for it to warm up and want to idle and run good but i've heard these bikes are cold blooded and do that.

                          I do have a couple questions though. I have the idle mixture screws backed out 3-3/4 turns!!! With being backed out that far and running stock 110 mains, do you guys think I should bump up to 112.5's or even 115's? Do you think I should take it to a mechanic and have it "final tuned" to make it run better or "like it should"? I'm not sure how it's supposed to run or what not...

                          Thanks to everyone on here offering their advice and knowlege. Thanks to you all I "rebuilt" my first bike and made it road worthy. I feel proud that I didn't have to hire a mechanic to do it for me and it wouldn't have been possible without this site and it's members, THANK YOU!
                          1981 XS1100 Special

                          "A well regulated Militia, being necessary to the security of a free State, the right of the people to keep and bear Arms, shall not be infringed." 2nd Amendment

                          Comment

                          • #14
                            Sync the carbs first. Then check to see how the idle mix screws are. Main jets won't affect the idle mixture ( I'm SURE of that ). With your setup you may need to go up a size but get it running as good as it can with the stock stuff and read the plugs after it's been ridden a good bit.

                            With your setup the idle mix screws will need to be out a bit more than normal.
                            Greg

                            Everybody is a genius. But if you judge a fish by its ability to climb a tree, it will live its whole life believing that it is stupid.”

                            ― Albert Einstein

                            80 SG Ol' Okie;79 engine & carbs w/pods, 45 pilots, 140 mains, Custom Mac 4 into 2 exhaust, ACCT,XS850 final drive,110/90/19 front tire,TKat fork brace, XS750 140 MPH speedometer, Vetter IV fairing, aftermarket hard bags and trunk, LG high back seat, XJ rear shocks.

                            The list changes.

                            Comment

                            • #15
                              I forgot to mention, a couple of times, when I slowed to a stop with the clutch in, the bike died. It started right back up but it did die so.... not sure what to make of that.

                              I did synch the carbs the best a could with the vinyl tubing/brake fluid setup. I know they are close.
                              1981 XS1100 Special

                              "A well regulated Militia, being necessary to the security of a free State, the right of the people to keep and bear Arms, shall not be infringed." 2nd Amendment

                              Comment

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