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    GS1000 tank slappers

    Took the 1979 GS1000E for some plug chop tests the other night. When getting upto speeds of 150km/hr the handlebars start to shake from side to side, so much so that it becomes unsafe. I have recently had a brand new front tyre which has been balanced. The steering bearings were replaced 8 months ago with a set of tapered bearings, steering brace fitted. Just wondered what you guys thought, would like to safely to get above 6k revs without risking a lock to locker.

    #2
    check all the obvious. you say you have new front tyre and head bearings, so check rear wheel and swing arm bearings for play. make sure everything is tight on suspension and wheels etc.
    if you cant find anything obvious, fit a steering damper. it will make your bike feel so much different during high speed cornering or blatting it through the twisties....
    1978 GS1085.

    Just remember, an opinion without 3.14 is just an onion!

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      #3
      Have the shocks been dialled in? That seems slow to be getting that kind of problem.

      Does the slap start as a slow weave or is it fast?
      sigpic

      Don't say can't, as anything is possible with time and effort, but, if you don't have time things get tougher and require more effort.

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        #4
        Originally posted by tatu View Post
        Have the shocks been dialled in? That seems slow to be getting that kind of problem.

        Does the slap start as a slow weave or is it fast?
        that is just over 90MPH. hardly slow for a GS....... tank slappers can occur at half that speed in some situations
        1978 GS1085.

        Just remember, an opinion without 3.14 is just an onion!

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          #5
          It starts as a slow weave at around 85mph then gets more pronounced from 90 to 95mph so much so that it is unsafe.

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            #6
            have you checked tyre pressures? try altering them slightly front and rear, see if it makes any difference
            1978 GS1085.

            Just remember, an opinion without 3.14 is just an onion!

            Comment


              #7
              Was there a time when she was stable at 150 ?
              Where did that fairing and fender come out of. I'd be inclined to whip one or both off and see what happens.
              Is that a TKV 11 on the front.
              97 R1100R
              Previous
              80 GS850G, 79 Z400B, 85 R100RT, 80 Z650D, 76 CB200

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                #8
                Tighten the steering head bearings.

                Comment


                  #9
                  You could try lowering your triple down your forks about a 1/4 in -5mm or so, I had a similar problem on my Roadkill bike and that took care of it. If you use a dampener you are just disguising the problem
                  1984 GS1100GK newest addition to the heard
                  80 GS 1000gt- most favorite ride love this bike
                  1978 GS1000E- Known as "RoadKill" , Finished :D
                  83 gs750ed- first new purchase
                  85 EX500- vintage track weapon
                  1958Ducati 98 Tourismo
                  “Remember When in doubt use full throttle, It may not improve the situation ,but it will end the suspense ,
                  If it isn't going to make it faster or safer it isn't worth doing

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                    #10
                    Originally posted by Brendan W View Post
                    Was there a time when she was stable at 150 ?
                    Where did that fairing and fender come out of. I'd be inclined to whip one or both off and see what happens.
                    Is that a TKV 11 on the front.
                    I would try this first, and make sure that your rear end is dialled in right, the ohlins on the back of my bike were the cause of what you describe till they were set up when I first rebuilt the bike.
                    sigpic

                    Don't say can't, as anything is possible with time and effort, but, if you don't have time things get tougher and require more effort.

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                      #11
                      Never heard of a GS doing that. Ever.
                      http://img.photobucket.com/albums/v5...tatesMap-1.jpg

                      Life is too short to ride an L.

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                        #12
                        Will double check the tyre pressures, and tighten those steering head bearings, she's now running on Avon Roadriders. Will consider after checking everything out the lowering of the triple 5mm. Not sure what you mean by dialling in your rearend if you could please elaborate.

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                          #13
                          Originally posted by gs79 View Post
                          Will double check the tyre pressures, and tighten those steering head bearings, she's now running on Avon Roadriders. Will consider after checking everything out the lowering of the triple 5mm. Not sure what you mean by dialling in your rearend if you could please elaborate.
                          By dialling in I mean setting rebound and damping rate etc,they are adjustable?
                          sigpic

                          Don't say can't, as anything is possible with time and effort, but, if you don't have time things get tougher and require more effort.

                          Comment


                            #14


                            I'm no expert, but Sandy mentions in this thread about how he has his 1000 set up. I tried stiffning the rear of my 650g and it has improved my wobble quite a bit, so far.

                            cg
                            sigpic
                            83 GS1100g
                            2006 Triumph Sprint ST 1050

                            Ohhhh!........Torque sweet Temptress.........always whispering.... a murmuring Siren

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                              #15
                              If you have the air forks make sure that the pressures are the same. You should also check the fork oil and make sure that both forks are filled equally. My previous 1000 did the same at about the same speed until I found that one fork had leaked all the air out while the other was still at about 11psi.
                              http://img633.imageshack.us/img633/811/douMvs.jpg
                              1980 GS1000GT (Daily rider with a 1983 1100G engine)
                              1998 Honda ST1100 (Daily long distance rider)
                              1982 GS850GLZ (Daily rider when the weather is crap)

                              Darn, with so many daily riders it's hard to decide which one to jump on next.;)

                              JTGS850GL aka Julius

                              GS Resource Greetings

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