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  • Scraping - bottoming out

    So, I put some new skins on: Shinko 712's what a difference over those old Dunlop 404's, literally night and day. Now I can push it harder in the corners but I noticed that it bottoms out, there is a scrapping sound, especially in right hand leaners. My rear suspension is set at the second firmest setting and it pogos when I am pushing it (zero rebound dampening). Can these shocks be rebuilt? I am looking for a cost effective solution. Thanks
    1980 G
    Jardine Spaghetti

    http://s1337.photobucket.com/user/Ug...ish/slideshow/

  • #2
    Hey 1887,

    The OEM shocks can't be rebuilt...and they NEVER had rebound dampening anyways! SO....you'll want to look into getting some other shocks..... many here recommend the XJ shocks which ARE rebuildable, and are air assisted as well. I do not know if they have rebound dampening though?? But almost all modern shocks will have both compression and expansion dampening. Folks have had decent experience with even just the cheap ones you can get from Partsnmore.com or Mikesxs.net vs. putting $400 into some bigger brands.

    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


    • #3
      All shocks have rebound dampening (except possible mine, haha).
      1980 G
      Jardine Spaghetti

      http://s1337.photobucket.com/user/Ug...ish/slideshow/

      Comment


      • #4
        Are you sure they are stock length shocks? Some PO may have swapped them out for shorter ones so he could look cool.
        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


        • #5
          Originally posted by BA80 View Post
          Are you sure they are stock length shocks? Some PO may have swapped them out for shorter ones so he could look cool.
          good point, I don't know if they a stock length. They look stock to me, I guess I'll have to measure them, what length should they be? Center of eyelet to center of eyelet on the center stand (that's a lot of centers).
          1980 G
          Jardine Spaghetti

          http://s1337.photobucket.com/user/Ug...ish/slideshow/

          Comment


          • #6
            12.5".................
            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


            • #7
              The stock shocks are actually 12 5/8" (yeah, it's only 1/8"... LOL) and weren't that good when new. But these bikes didn't handle all that well when new if you pushed them hard....
              Fast, Cheap, Reliable... Pick any two

              '78E original owner - resto project
              '78E ???? owner - Modder project FJ forks, 4-piston calipers F/R, 160/80-16 rear tire
              '82 XJ rebuild project
              '80SG restified, red SOLD
              '79F parts...
              '81H more parts...

              Other current bikes:
              '93 XL1200 Anniversary Sportster 85RWHP
              '86 XL883/1200 Chopper
              '82 XL1000 w/1450cc Buell, Baker 6-speed, in-progress project
              Cage: '13 Mustang GT/CS with a few 'custom' touches
              Yep, can't leave nuthin' alone...

              Comment


              • #8
                Just measured them, center to center they are 12 5/8".
                1980 G
                Jardine Spaghetti

                http://s1337.photobucket.com/user/Ug...ish/slideshow/

                Comment


                • #9
                  The shocks look 100% stock to me. Maybe the spring has weakened over time or these bikes just bottom out easily? Can I replace this with any 12.5" shock? Maybe I can track down some used Progressive 412's or 430's.
                  1980 G
                  Jardine Spaghetti

                  http://s1337.photobucket.com/user/Ug...ish/slideshow/

                  Comment


                  • #10
                    I find my center stand will touch down when I hit a bump in a hard corner. Pegs will drag first usually.
                    '79 XS11 F
                    Stock except K&N

                    '79 XS11 SF
                    Stock, no title.

                    '84 Chevy K-10 "Big Blue"
                    GM 350, Muncie SM465, NP208, GM 10 Bolt with 3.42gears turnin 31x10.5 Baja Claws

                    "What they do have is an implacable, unrelenting presence and movement that bespeaks massive power lurking behind paint and chrome. They don't wail like a screeching ninja, the don't rumble like a harley. They just growl like a spactic, stressed out badger waiting to rip your face off and eat your soul." Trainzz~RIP~

                    Comment


                    • #11
                      +

                      id be extremely careful going around corners too fast with the shaft drive. the rear wheel will kick out on you. my footpegs also bottom out when im too low around the corners too givin me a warning lol
                      Max

                      81 XS1100SH Black Beast Mutt
                      Kerker 4/1
                      stock carbs and air box.
                      78 headlite, handle bars,
                      1 set of ea-160/85mph guages,
                      crash bars, cruise control

                      Other 2 Wheelers
                      78 XS1100E jet kit, Kerker 4/1, air pods, jet kit-RIP
                      94 CBR1000F jet kit,Two Bros pipe, K&N Filter

                      Comment


                      • #12
                        "id be extremely careful going around corners too fast with the shaft drive. the rear wheel will kick out on you" What do you mean kick out?

                        I don't plan on blazin the twisties with this old girl (its not just the back the sucks, the front end feels like twist ties), but I'd like to be able to ride at a spirited pace.
                        1980 G
                        Jardine Spaghetti

                        http://s1337.photobucket.com/user/Ug...ish/slideshow/

                        Comment


                        • #13
                          Originally posted by mjpxs11sh View Post
                          id be extremely careful going around corners too fast with the shaft drive. the rear wheel will kick out on you. my footpegs also bottom out when im too low around the corners too givin me a warning lol
                          That's kind of a brash statement don't ya think? I've driven my bike hard into and out of many tight corners and have never had my tire kick out.
                          '79 XS11 F
                          Stock except K&N

                          '79 XS11 SF
                          Stock, no title.

                          '84 Chevy K-10 "Big Blue"
                          GM 350, Muncie SM465, NP208, GM 10 Bolt with 3.42gears turnin 31x10.5 Baja Claws

                          "What they do have is an implacable, unrelenting presence and movement that bespeaks massive power lurking behind paint and chrome. They don't wail like a screeching ninja, the don't rumble like a harley. They just growl like a spactic, stressed out badger waiting to rip your face off and eat your soul." Trainzz~RIP~

                          Comment


                          • #14
                            1887,

                            I don't know about the shaft drive having anything to do with it but the centerstand foot lever doesn't fold up like the footpegs.

                            When it hits the ground in a left-hand turn it can't 'give' at all so it acts as a fulcrum. If the bike continues to lean, the rear wheel lifts up and the back end instantly slips to the right, "Boop! There it is!"


                            The only way I can think of for the shaft drive to make the rear wheel slip in a turn is if you were decelerating into a corner, then suddenly accelerated. The sudden "kick" from taking up the lash in the drive train can break the rear tire loose if you do it j-u-u-u-ust wrong but a chain drive can do the same thing.

                            .
                            -- Scott
                            _____

                            2004 ST1300A: No name... yet
                            1982 XJ1100J: "Baby" SS Brakes, '850 FD, ACCT
                            1980 XS1100G: "Columbo" SS Brakes, '850 FD, ACCT
                            1979 XS1100SF: "Bush" W.I.P.
                            1979 XS1100F: parts
                            2018 Heritage Softail Classic 117 FLHCS SE: "Nanuk" It's DEAD, it's not just resting. It is an EX cycle.

                            Comment


                            • #15
                              Smooth application of throttle is pretty much go fast 101, maybe a bit more so on a big ole shaftie. And I can deal with hitting the hard parts, center stand, exhaust pegs etc. I was just worried about rear wheel kicking out statement.

                              Its a fun bike to ride it reminds me of the '72 Buick I had with Dunlop Gold Seal bias tires.
                              1980 G
                              Jardine Spaghetti

                              http://s1337.photobucket.com/user/Ug...ish/slideshow/

                              Comment

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