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  • I know the problem.

    Many years ago, before I got a real job, I was paid to be a reporter at a midsized West Texas newspaper. Although I normally covered courts, I was "asked" to do some stories about the city council election. As candidates for city council normally go, the people offering themselves for public service were something less than impressive. I told my editor I was going to run for the council myself because I already knew my campaign slogan. I asked for a donation so I could it put up billboards all over town:

    "I know the problem - and I want to be part of it."

    My editor was not good at hiding his sense of humor. He stared at me grim faced and ordered me from his office. He thought, at the time, that it was funny to suggest I never return. I could tell he thought it was funny by the way he screamed it.

    Anyway, that's just a roundabout way of not getting to the point.

    I kinda like Dragon's suggestion that I shoot some propane around the carb boot on no. 1, which faithful readers know was alone among my quartet of cylinders unfamiliar with low-rev fire. Being somewhat averse to running down the street screaming and aflame - although I'm convinced I could pull that off in a really cool way - I instead opted for B-12.

    After I started the CD of Tibetan healing chants that I downloaded from the internet, I started the bike and let it idle. I sprayed the B-12.

    What's that? No. 1? It fired! The idle smoothed. The header got hot.

    I wept.

    My brand new no. 1 carb boot is so drafty, in fact, that after about 20 seconds of spraying and crying I managed to flood it out.

    I'm Irish. We cry. Deal with it.

    A Ford thermostat gasket (thanks, John) and perhaps some high-temp gasket sealer and I believe I'll have a ride.

    If I'd had to reprogram the TCI I likely would have figured it out weeks ago. It's the simple things that baffle me.

    Patrick
    Last edited by Incubus; 06-19-2007, 07:13 PM.
    The glorious rays of the rising sun exist only to create shadows in which doom may hide.

    XS11F (Incubus, daily rider)
    1969 Yamaha DT1B
    Five other bikes whose names do not begin with "Y"

  • #2
    Whaaaa?

    Did I hear you correctly? The Succubus, she, um...sucks?
    Was there some crap on the mating surface on the head that caused the vacuum leak? Anyway congratulations.

    Comment


    • #3
      Was there some crap on the mating surface

      And if there was... wanna explain how it got there?!?


      Tod
      Try your hardest to be the kind of person your dog thinks you are.

      You can live to be 100, as long as you give up everything that would make you want to live to be 100!

      Current bikes:
      '06 Suzuki DR650
      *'82 XJ1100 with the 1179 kit. "Mad Maxim"
      '82 XJ1100 Completely stock fixer-upper
      '82 XJ1100 Bagger fixer-upper
      '82 XJ1100 Motor/frame and lots of boxes of parts
      '82 XJ1100 Parts bike
      '81 XS1100 Special
      '81 YZ250
      '80 XS850 Special
      '80 XR100
      *Crashed/Totalled, still own

      Comment


      • #4
        I haven't pulled the carb holder yet. I would be amazed if there is anything on the mating surface. It was shiny when I installed the holders. I'm more inclined to believe that the mating surface on the carb holder is not completely flat or the bolts bottomed out. I got all four holders new at the same time and all the others are apparently fine.

        My wife has given me another assignment tonight. The carb holder comes off tomorrow.

        And yes, John, Succubus sucks big time - but finally in a good way....

        Patrick
        The glorious rays of the rising sun exist only to create shadows in which doom may hide.

        XS11F (Incubus, daily rider)
        1969 Yamaha DT1B
        Five other bikes whose names do not begin with "Y"

        Comment


        • #5
          Very Interesting...I've heard something like this before!

          T.C. stated in Another Direction thread on 6-17-07:
          Hey Patrick,

          Courtney on the Yahoo groups is having the same issue, and it has occurred with 2 sets of carbs! He has also swapped plug wires, and it has stayed with the #1 cylinder, and he also has similar compression values!

          I can't remember and didn't re-read your other thread, but did you put on new intake manifold boots, or are these the OEM? IF OEM, did you put NEW Synch Port caps on? A fellow Xsive was having trouble getting bike to synch and idle right, turned out the port caps had hardened and even though felt snug was actually loose and leaking....just enough to prevent a good vacuum at low rpm so that it wouldn't draw the fuel thru the pilot circuit properly, but once rpms were up, it could draw enough to get the fuel from the mains and run! JAT?

          Also, any leaks where the boots mount to the engine?
          T.C.
          Just glad you were finally able to find/figure it out!
          T.C.
          T. C. Gresham
          81SH "Godzilla" . . .1179cc super-rat.
          79SF "The Teacher" . . .basket case!
          History shows again and again,
          How nature points out the folly of men!

          Comment


          • #6
            And, T.C., you were right. Again.

            Now I need to start looking for rear shocks....
            The glorious rays of the rising sun exist only to create shadows in which doom may hide.

            XS11F (Incubus, daily rider)
            1969 Yamaha DT1B
            Five other bikes whose names do not begin with "Y"

            Comment


            • #7
              Refresh my mind, Succubus - are you running the stock irbox or individual filters? I'm working on a thoery here...
              Ken Talbot

              Comment


              • #8
                EXCELLENT,
                Or is that elegent. Glad you found the problem, it did sound the same as mine. BTW, the reason for using propane is that if something does catch fire all you have to do is move the torch away from the bike and all you have is a lit torch. If you are spraying a flammable liquid on the machine and something catchs on fire you might as well go get the hot dogs. In my more unlightend days I used to use starting fluid on vehicles to find vacuum leaks until I discovered that it would start more than engines, that was a nice pickup truck too.
                Please keep us posted on just what caused the leak!
                The Old Tamer
                _________________________
                1979 XS1100SF (The Fire Dragon)
                1982 650 Maxim (The Little Dragon)
                another '82 650 Maxim (Parts Dragon)
                1981 XS1100SH (The Black Dragon)

                If there are more than three bolts holding it on there, it is most likely a very important part!

                Comment


                • #9
                  Most excellent!!! Goes to show ya new parts can be bad. I guess I will go put my airbox back on now. Lemme know when your ready for a true shakedown cruise.
                  When a 10 isn't enough, get a 11. 80g Hardbagger

                  Comment


                  • #10
                    Hi Ken,

                    I'm running the stock airbox. Until a few days ago I was running a Uni foam filter, but I just replaced it with a K&N. The air filter was an earlier theory of mine. I'm not sure why I thought the filter could affect one cylinder and not the others, but I was chasing my tail pretty vigorously. I discounted the possibility that it could be the carb holders when I installed the new ones.

                    A hundred bucks for a vacuum leak.....

                    One upside of this chase. I am pretty sure the rest of my ignition/intake system is in top notch condition. And boy, are my carbs clean.

                    Patrick
                    The glorious rays of the rising sun exist only to create shadows in which doom may hide.

                    XS11F (Incubus, daily rider)
                    1969 Yamaha DT1B
                    Five other bikes whose names do not begin with "Y"

                    Comment


                    • #11
                      Glad to hear you got it , And TC's excellent call !!

                      I know my bike would not be running as soon as it has with out
                      our TEAM(the people) of this site ...

                      Aye , be sure to check vacuum leaks on new parts .
                      A new Irish proverb ...

                      Bob
                      1979 XS1100 SPECIAL (under 18,000 miles Sold 5/12/2016
                      1982 XJ1100 MAXIM(PARTS BIKE??)shows 14,000 miles ??? Up for sale whole or parts

                      Comment


                      • #12
                        Originally posted by Succubus
                        I'm running the stock airbox.
                        Well, so much for that theory. I often wonder if runing individual filters without some sort of support for the carb bank might cause some vibration-linked vacuum leakage where the boots meet the head. This might not be apparent when the bike is sitting still, but could show up as soon as you start moving. Sounds like that wasn't your problem though.
                        Ken Talbot

                        Comment


                        • #13
                          Yeah any air leaks shoulda' been found and fixed long ago before delving into carbs, includes vacline to petcock hose, two carb boot caps, manifolds, steel straps on the boots, sealed at airfilter end too

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