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Gas tank mystery ,someone explain this one

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  • #1

    Gas tank mystery ,someone explain this one

    The gas tank on my 80SG has somehow gained an extra 2 inches in width over this past winter. How it that possible?
    I am having trouble posting pics, Ben will post some shortly



    The black tank has been on my bike since 2005 when I bought . It is the original tank with original paint. For some reason it has gained an extra 2 inches in width and will not fit on the frame anymore. It will bolt on but there is nothing keeping the front of the tank attached to the bike, you can lift it right off the frame. There are no unusual bends or creases on the top of the tank, there are some on the tunnel pan.

    The white tank is a spare and fits fine.

    I want to know how a welded gas tank can gain extra width . I was not like that last year.
    Slow down and enjoy life. If you are in that much of a hurry, you should have left eariler.
    Current rides:
    80 XS1100SG
    82 JX1100
    83 Venture Royale
    86 V-Max
    Tags: None
  • #2
    Heres the pics

    Posting these for you Mark...


    1980 XS650G Special-Two
    1993 Honda ST1100

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    • #3
      Was something heavy stored on the tank? It could be soft, but if the tank was on concrete and there was boxes or other parts around it and someone put something heavy on top, it COULD expand from the pressure. Think of the front of the tank on the smooth, hard surface. Now push down with 150Lbs of pressure for a few months. The petcocks would keep the back up, so the pressure would try to drive the front into the concrete and cause the points to spread apart.
      This is ONLY a theory, not knowing how the tank was stored.
      OK, just saw the pics. SOMETHING pushed the sides out! Look at the front of both tanks, and you can see the front edges of the black tank are curled out! You might try making a "clamp" from two short bits of flat stock, and put one clamp on each side of the tank. Then use a large "C" clamp to try and squeeze it back to shape.
      Last edited by DiverRay; 06-19-2017, 09:33 AM.
      Ray Matteis
      KE6NHG
      XS1100 E '78 (winter project)
      XS1100 SF Bob Jones worked on it!

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      • #4
        The black tank was on the bike...nothing was put on top of it AFAIK
        1980 XS650G Special-Two
        1993 Honda ST1100

        Comment

        • #5
          The black tank has been on my bike since 2005. It has always fit properly. There are even wear marks on the front mounting tabs where the frame rubber mounts were in contact with the tank. It fit perfect last September for XSSE rally. I had to remove the tank to replace the ignition coils and noticed it did not fit well, I could lift up the front of the tank.
          Slow down and enjoy life. If you are in that much of a hurry, you should have left eariler.
          Current rides:
          80 XS1100SG
          82 JX1100
          83 Venture Royale
          86 V-Max

          Comment

          • #6
            Originally posted by mlew View Post
            The black tank has been on my bike since 2005. It has always fit properly. There are even wear marks on the front mounting tabs where the frame rubber mounts were in contact with the tank. It fit perfect last September for XSSE rally. I had to remove the tank to replace the ignition coils and noticed it did not fit well, I could lift up the front of the tank.
            Rubber pads below the tank sockets?
            Skids (Sid Hansen)

            Down to one 1978 E. Stock air box with K&N filter, 81H pipes and carbs, 8500 feet elevation.

            Comment

            • #7
              Originally posted by skids View Post
              Rubber pads below the tank sockets?
              Nope, they are in the tank sockets. Lust like they are suppose to be.
              Slow down and enjoy life. If you are in that much of a hurry, you should have left eariler.
              Current rides:
              80 XS1100SG
              82 JX1100
              83 Venture Royale
              86 V-Max

              Comment

              • #8
                I only way I can see it getting that way is, with the rear tank bolt out the rear of the tank was moved from side to side. This would have jacked the front apart.

                Earl
                80SG, 81SH, 80 standard parts bike, 81SH parts bike
                and new to me 78 standard dresser

                Comment

                • #9
                  When i bought my bike the tank was like that. No idea what could have caused it, but i put a bolt and a few washers before the rubber stoppers on the front to compensate.
                  1979 XS1100F "Roxy" (my first bike ) - '91 Suzuki GSX1100 Fairing, BMW bags, Cheap ABS Trunk, aftermarket cruiser seat, MAC 4-2 exhaust, Heavy Duty folding kickstart, XS11 Special signals and gauges, Blade Fuse Conversion, Dynacoil Greens w/ ballast bypass, SS brake lines

                  Comment

                  • #10
                    My fuel tank was welded and it got narrower by heat distortion to the point I had to cut off half of the tabs that go over the rubbers.
                    Another tank on which my painter wanted to remove some dents by air pressure looked like a turtle afterwards because he used too much pressure. Both sides flipped up, much more than yours and made the tank useless.
                    Is it possible your breather is not open and the tank expanded by a higher inner pressure? Maybe from higher temperatures?
                    XS1100 3X0 '82 restomod, 2H9 '78 chain drive racer, 3H3 '79 customized.
                    MV Agusta Brutale 910R '06.
                    Triumph 1200 Speed Trophy '91, Triumph 1200 '93.
                    Z1 '73 restomod, Z1A '74 yellow/green, KZ900 A4 '76 green.
                    Yamaha MT-09 Tracer '15 grey.
                    Kawasaki Z1300 DFI '84 modified, red.

                    Comment

                    • #11
                      Is it possible your breather is not open and the tank expanded by a higher inner pressure? Maybe from higher temperatures?
                      ...or frozen. If you've brimmed the tank for storage and it froze, that could do it too if the breather was blocked
                      79 SF Special W/ Stock all original motor @ 384,000klms
                      Stock exhaust, stock airbox, XJ sump, 78E carbs, Xs1100RH seat, Bosch superhorns, 5/8ths front M/c, braided lines, sintered SBS pads, drilled discs, progressive springs, 8" 50w HID headlight 4300K, 2 x 50w HID spiral driving lights, KONI shocks, Spade fuse box
                      *Touring mode - Plexistar 2 screen, Gearsack rack & bag & saddlebags, homebuilt towbar
                      *"The Keg"- UC torana hubs, XS11 discs, Tokico 4 spot calipers

                      Comment

                      • #12
                        The gas tank vent has always been clear, I don't see it possible for pressure to build up in the tank and cause it to bulge(the tank gasket has leaked for a few years). It does not get cold enough in central NC to freeze gasoline so I think that's out also. I do think it might be possible for the heat of the sun to do it. The bike has been ridden regularly to work and it does sit in the sun all day.

                        On a good note I was able to straighten the tank and it does fit on now. I wrapped a few ratchet straps around the tank and massaged the tank belly with a wood block and rubber mallet. A few blows in the corners where the metal had creased helped it go back into shape. It did not even mess the paint up.
                        Slow down and enjoy life. If you are in that much of a hurry, you should have left eariler.
                        Current rides:
                        80 XS1100SG
                        82 JX1100
                        83 Venture Royale
                        86 V-Max

                        Comment

                        • #13
                          Glad you got it to fit...very strange...
                          1980 XS650G Special-Two
                          1993 Honda ST1100

                          Comment

                          • #14
                            sun and glass

                            The sunshine at a certain angle in clear sky going threw glass can magnify to the point where its like a torch applied. If you had just a small amount of gas and the sun was right when it hit the tank heat could be incredible have seen it start fires with newspaper before by shinning on a clear jar. Would mean the vent was clogged though. I doubt pressure could get that great that fast if the vent was good.
                            To fix the problem one should not make more assumptions than the minimum needed.

                            Rodan
                            https://www.youtube.com/watch?v=khm6...liHntN91DHjHiS
                            1980 G Silverbird
                            Original Yamaha Fairfing and Bags
                            1198 Overbore kit
                            Grizzly 660 ACCT
                            Barnett Clutch Springs
                            R1 Clutch Fiber Plates
                            122.5 Main Jets
                            ACCT Mod
                            Mac 4-2 Flare Tips
                            Antivibe Bar ends
                            Rear trunk add-on
                            http://s1184.photobucket.com/albums/z329/viperron1/

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