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Wurring sound… from trans or final drive?

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    #1

    Wurring sound… from trans or final drive?

    Ok, bummer from my so reliable 1982 1100G.
    A notable wurr from trans or final drive while riding in 5th, at 2700-3000 rpm. That's about 30-35 mph. Will do it in 4th at same RPM and load.
    Sound goes away when load is decreased (coasting) and as 3000 RPM is exceeded (above 40 mph).
    New sound, is this a bearing failure in the final drive?
    Thanks!
    Last edited by Buffalo Bill; 08-11-2021, 03:57 PM.
    "Only fe' collected the old way, has any value." from His Majesty O'Keefe (1954 film)
    1982 GS1100G- road bike, body, seat and suspension modded
    1990 GSX750F-(1127cc '92 GSXR engine) track bike, much re-engineered
    1987 Honda CBR600F Hurricane; hooligan bike, restored
    Tags: None
    #2
    (Subscribed)

    Had 850G for 14 years. Now have GK since 2005.
    GK at IndyMotoGP Suzuki Display... ... GK on GSResources Page ... ... Euro Trash Ego Machine .. ..3 mo'cykls.... update 2 mocykl


    Comment

      #3
      I don't know what the problem is, but I do know that the #1 problem with the drivetrain on the 1100G bikes is the secondary drive gears. There are a fair number of instances where the torque of the 1100 engine shears off the driven gear in the set.
      Ed

      To measure is to know.

      Mikuni O-ring Kits For Sale...https://www.thegsresources.com/_foru...ts#post1703182

      Top Newbie Mistakes thread...http://www.thegsresources.com/_forum...d.php?t=171846

      Carb rebuild tutorial...https://gsarchive.bwringer.com/mtsac...d_Tutorial.pdf

      KZ750E Rebuild Thread...http://www.thegsresources.com/_forum...0-Resurrection

      Comment

        #4
        If I could ride along next to it in another vehicle, I would get a better idea what region the sound is coming from.
        Now I just have to look down quick and kinda detect the area.
        "Only fe' collected the old way, has any value." from His Majesty O'Keefe (1954 film)
        1982 GS1100G- road bike, body, seat and suspension modded
        1990 GSX750F-(1127cc '92 GSXR engine) track bike, much re-engineered
        1987 Honda CBR600F Hurricane; hooligan bike, restored

        Comment

          #5
          Where should I look for parts to repair the the drive train?
          "Only fe' collected the old way, has any value." from His Majesty O'Keefe (1954 film)
          1982 GS1100G- road bike, body, seat and suspension modded
          1990 GSX750F-(1127cc '92 GSXR engine) track bike, much re-engineered
          1987 Honda CBR600F Hurricane; hooligan bike, restored

          Comment

            #6
            The sound reminds me of a time the pinion nut came loose on my 1980 Monza Spider.
            I had to drive another 30 blocks of stop and go urban neighborhoods.
            As long as it was under load it was fine, lot of slack and play between the gear teeth.
            "Only fe' collected the old way, has any value." from His Majesty O'Keefe (1954 film)
            1982 GS1100G- road bike, body, seat and suspension modded
            1990 GSX750F-(1127cc '92 GSXR engine) track bike, much re-engineered
            1987 Honda CBR600F Hurricane; hooligan bike, restored

            Comment

              #7
              Pull the rubber boot off the front joint of the drive shaft - and see if you can move the universal joint forward and back. It's also possible you'll find the retaining nut sitting in there. They break the reduced diameter piece off the end of the secondary shaft - which is threaded for the retaining nut.

              In the past i have pulled the assembly and drilled and tapped the exposed end for a large capscrew to do the same job. 14mm from memory.

              Comment

                #8
                Yes, pull back the boot....maybe you’ll get lucky and find it’s the u-joint or propeller shaft spline
                1981 gs650L

                "We are all born ignorant, but you have to work hard to stay stupid" Ben Franklin

                Comment

                  #9
                  It sounds like a shaft issue, you could maybe see something unusual in checking the lash by putting it in gear, holding the crank still on the nut and rocking the wheel back and forth. You might see or hear something that might help diagnose...?
                  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

                    #10
                    These are good suggestions for a look see. The sound is strong enough I better not ride it.

                    Looks like I'll have to put the plates on my track bike if I wanna do some joy riding.
                    Side note, spending my track money on the house this year…sigh
                    "Only fe' collected the old way, has any value." from His Majesty O'Keefe (1954 film)
                    1982 GS1100G- road bike, body, seat and suspension modded
                    1990 GSX750F-(1127cc '92 GSXR engine) track bike, much re-engineered
                    1987 Honda CBR600F Hurricane; hooligan bike, restored

                    Comment

                      #11
                      I put the bike on a rear wheel jack and ran it in 1st 2nd and 3rd, 2000 - 2500 rpms.
                      I hear gear slack/play in the trans area. It's particularly clunky as the engine idles in gear.
                      Noticeable out of balance vibration of rear wheel with bike in 1st at 2000rpm.
                      Last edited by Buffalo Bill; 08-12-2021, 10:47 AM.
                      "Only fe' collected the old way, has any value." from His Majesty O'Keefe (1954 film)
                      1982 GS1100G- road bike, body, seat and suspension modded
                      1990 GSX750F-(1127cc '92 GSXR engine) track bike, much re-engineered
                      1987 Honda CBR600F Hurricane; hooligan bike, restored

                      Comment

                        #12
                        Originally posted by Buffalo Bill View Post
                        I put the bike on a rear wheel jack and ran it in 1st 2nd and 3rd, 2000 - 2500 rpms.
                        I hear gear slack/play in the trans area. It's particularly clunky as the engine idles in gear.
                        Noticeable out of balance vibration of rear wheel with bike in 1st at 2000rpm.

                        Leave it on the jack/stand, put the bike in gear and rock the wheel back and forth by hand see if there's anything unusual there, try taking it out of gear and rotating the wheel by hand listen and feel for anything... Check the oil in the bevel gear, is it dirty with debris....
                        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

                          #13
                          A few years ago (2017) I had need to learn a little bit about the secondary gear set.
                          Looking at drawings in manual were not helping me much, but eventually I figured a few things. ANd then added some notes that helped me.



                          Symptom I had was vibration/shuddering on hard deceleration. I haven't heard you mention anything like that, so I haven't said anything.
                          But others are talking about the secondary gears.
                          Last edited by Redman; 08-12-2021, 10:05 PM.

                          Had 850G for 14 years. Now have GK since 2005.
                          GK at IndyMotoGP Suzuki Display... ... GK on GSResources Page ... ... Euro Trash Ego Machine .. ..3 mo'cykls.... update 2 mocykl


                          Comment

                            #14
                            Originally posted by Redman View Post
                            A few years ago (2017) I had need to learn a little bit about the secondary gear set.
                            Looking at drawings in manual were not helping me much, but eventually I figured a few things. ANd then added some notes that helped me.



                            Symptom I had was vibration/shuddering on hard deceleration. I haven't heard you mention anything like that, so I haven't said anything.
                            But others are talking about the secondary gears.
                            Dave, I remember that thread. Can you post a linc? Thanks!
                            "Only fe' collected the old way, has any value." from His Majesty O'Keefe (1954 film)
                            1982 GS1100G- road bike, body, seat and suspension modded
                            1990 GSX750F-(1127cc '92 GSXR engine) track bike, much re-engineered
                            1987 Honda CBR600F Hurricane; hooligan bike, restored

                            Comment

                              #15
                              You can see the reduced end on the upper #1 - the driven shaft. That is what breaks off.

                              Comment

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