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  • #1

    Strange Stall?

    Hi everyone,
    Second day in a row the bike has done this. Rides perfect to work not a miss tick or anything. Sets all day in the Florida Sunshine 80s today. I jump on at 330 fires right up go 2-3 minutes and stalls like out of gas, Yesterday after 30 or more seconds trying to start it (puts puts puts) I put it on first choke and it started ran fine, took the chock off and put 25 miles on it ran perfect. Today Perfect in morning, same thing after work, got it to start by switching to reserve on my pets. Mile or so down the road turned them back and still ran fine.

    Did I get some crap gas?

    any ideas
    Bike History:1980 XS 1100 special current bike
    1980 XS 850 special wife sold
    Tags: None
  • #2
    Clogged gas tank cap vent?
    1979 XS1100F
    2H9 Mod, Truck-Lite LED Headlight, TECHNA-FIT S/S Brake Lines, Rear Air Shocks, TKAT Fork Brace, Dyna DC-I Coils, TC Fuse Block, Barnett HD Clutch Springs, Superbike Handlebars, V-Star 650 ACCT, NGK Irridium Plugs, OEM Exhaust. CNC-Cut 2nd Gear Dogs; Ported/Milled Head; Modded Airbox: 8x8 Wix Panel Filter; #137.5 Main Jet, Viper Yellow Paint, Michelin Pilot Activ F/R, Interstate AGM Battery, 14MM MC, Maier Fairing, Cree LED Fog Lights.

    Comment

    • #3
      I dont know

      I kind of thought something like a hot vapor lock but today I put my key in and opened my tank for a second before I started it
      Bike History:1980 XS 1100 special current bike
      1980 XS 850 special wife sold

      Comment

      • #4
        Hey Jeff,

        You're leaving out important details....we can't remember everyones bike or their condition....so things like if you still have the OCTY vacuum control valve on it, or are you running it just straight from petcocks to carbs?

        IF you do have the Octy, it's diaphragm may be sticking a bit, or the vac. hose to it may be cracked/leaking?? Sitting in hot sun....fuel evaporates from the bowls. THEN if you don't PRIME the carbs first, AND if the octy isn't flowing properly, you may be running low on fuel because the bowls can't get refilled like they need to be.

        IF you don't have the Octy, then again, fuel evaporating while sitting. The special petcocks are just gravity feed/flow....and just turning them to ON would be the same as PRIME without the Octy. But if the bowls aren't filling after sitting....then it could be too long/low of a loop of fuel line from the petcocks to the carbs....or crud in the carb inlet T's, or the bowl float valve screen? As mentioned earlier, a clogged gas cap vent can prevent the fuel flow...but you stated you have been able to drive 20-30 miles without a problem.

        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

        • #5
          day off and again today

          Originally posted by TopCatGr58 View Post
          Hey Jeff,

          You're leaving out important details....we can't remember everyones bike or their condition....so things like if you still have the OCTY vacuum control valve on it, or are you running it just straight from petcocks to carbs?

          IF you do have the Octy, it's diaphragm may be sticking a bit, or the vac. hose to it may be cracked/leaking?? Sitting in hot sun....fuel evaporates from the bowls. THEN if you don't PRIME the carbs first, AND if the octy isn't flowing properly, you may be running low on fuel because the bowls can't get refilled like they need to be.

          IF you don't have the Octy, then again, fuel evaporating while sitting. The special petcocks are just gravity feed/flow....and just turning them to ON would be the same as PRIME without the Octy. But if the bowls aren't filling after sitting....then it could be too long/low of a loop of fuel line from the petcocks to the carbs....or crud in the carb inlet T's, or the bowl float valve screen? As mentioned earlier, a clogged gas cap vent can prevent the fuel flow...but you stated you have been able to drive 20-30 miles without a problem.

          T.C.
          I have a 1980 Special 1100 I do not think I have the Octy just gravity. Yesterday I filled it up on the way to work, turned the petcocks sideways to prime then back 15 minutes before I left work no problems nice 30 mile ride last night. Great on the way to work, then same old thing on the way home sputter sputter, turned the Petcock to reserve and fired right up and drove away. Turned them back on the reg and no problem the rest of the way home.
          Bike History:1980 XS 1100 special current bike
          1980 XS 850 special wife sold

          Comment

          • #6
            I have a 1980 Special 1100 I do not think I have the Octy just gravity. Yesterday I filled it up on the way to work, turned the petcocks sideways to prime then back 15 minutes before I left work no problems nice 30 mile ride last night.
            OK, this tells me you DO have the octy! When you use prime, it uses the front nipples on the petcock. Reserve, On use the rear nipple. I would look into a rebuild kit for the octy, as once done, they ARE pretty reliable. That should fix your problems. You can get rid of the octy and do the as some of the members here. Block off the front nipple on the petcock, and run fuel line from the rear to a pair of carbs.
            Ray Matteis
            KE6NHG
            XS1100 E '78 (winter project)
            XS1100 SF Bob Jones worked on it!

            Comment

            • #7
              Sounds to me like you'll need to do a thorough inspection of the fuel system including the inside of the tank.

              If you haven't done this yet, there may be 35 years of crud in them parts.

              Either that or your Eleven is allergic to your workplace, might be time for a career change.
              1980 XS1100G "Dolly G" Full Dresser (with a coat of many colors )
              1979 XS1100SF (stock-euro mods planned)
              1984 XV700L Virago (to be hot-modded)
              1983 XJ750MK Midnight Maxim (semi-restored DD)
              1977 XS650D ( patiently awaiting resto)

              Sometimes it takes a whole tank of gas before you can think straight.

              Comment

              • #8
                lol

                Originally posted by Schming View Post
                Sounds to me like you'll need to do a thorough inspection of the fuel system including the inside of the tank.

                If you haven't done this yet, there may be 35 years of crud in them parts.

                Either that or your Eleven is allergic to your workplace, might be time for a career change.
                to funny lol. I wish one of you all lived close
                Bike History:1980 XS 1100 special current bike
                1980 XS 850 special wife sold

                Comment

                • #9
                  At this time of year I wish I did too

                  Here's a diagrahm of your fuel system, maybe you can track down any discrepencies:

                  1980 XS1100G "Dolly G" Full Dresser (with a coat of many colors )
                  1979 XS1100SF (stock-euro mods planned)
                  1984 XV700L Virago (to be hot-modded)
                  1983 XJ750MK Midnight Maxim (semi-restored DD)
                  1977 XS650D ( patiently awaiting resto)

                  Sometimes it takes a whole tank of gas before you can think straight.

                  Comment

                  • #10
                    The only change to the diagram is that the PRIME SIDE has gas running out of the nipple ONLY ON PRIME. The ON and RESERVE gas runs out of the HOSE from the Octy.
                    Do check the octy, pull the one large phillips screw, take it off the carbs, and look for a very small hole on one side of it. it is the bleed hole for the vacuum. if it's plugged, or the vacuum hose from #2 manifold to the octy is split, it will not work correctly.
                    And yeah, it's a LONG drive from here to FL......
                    Ray Matteis
                    KE6NHG
                    XS1100 E '78 (winter project)
                    XS1100 SF Bob Jones worked on it!

                    Comment

                    • #11
                      Originally posted by DiverRay View Post
                      The only change to the diagram is that the PRIME SIDE has gas running out of the nipple ONLY ON PRIME.
                      Isn't that what the diagram shows or am I misunderstanding you.

                      And I agree with You and TC, that the problem may be found in a faulty octy valve or the manifold vac line.
                      1980 XS1100G "Dolly G" Full Dresser (with a coat of many colors )
                      1979 XS1100SF (stock-euro mods planned)
                      1984 XV700L Virago (to be hot-modded)
                      1983 XJ750MK Midnight Maxim (semi-restored DD)
                      1977 XS650D ( patiently awaiting resto)

                      Sometimes it takes a whole tank of gas before you can think straight.

                      Comment

                      • #12
                        Isn't that what the diagram shows or am I misunderstanding you.
                        That's what I get for trying to help from work. Trouble shooting electronics, then going to mechanical on a computer and NOT READING every work.
                        Ray Matteis
                        KE6NHG
                        XS1100 E '78 (winter project)
                        XS1100 SF Bob Jones worked on it!

                        Comment

                        • #13
                          Better

                          I got some sea foam and put 3/4 cup in a full tank. Got to thinking about it and I am going to do a tear down to install newer intake boots, I plan on just installing new lines, cleaning everything out.

                          I have 40 miles on the gas sea foam mix and it ran fine. It even left work ok also.

                          I just had carpel tunnel surgery and the bike set from daily driving to 16 days of not even starting I don't think. The problem started right after that.
                          Bike History:1980 XS 1100 special current bike
                          1980 XS 850 special wife sold

                          Comment

                          • #14
                            Originally posted by Schming View Post
                            At this time of year I wish I did too

                            Here's a diagrahm of your fuel system, maybe you can track down any discrepencies:



                            Thanks this is awesome!!!!!!
                            Bike History:1980 XS 1100 special current bike
                            1980 XS 850 special wife sold

                            Comment

                            • #15
                              octy

                              will someone post the link for the Octy replacement or rebuild kit.
                              Bike History:1980 XS 1100 special current bike
                              1980 XS 850 special wife sold

                              Comment

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