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79 Special starting to Shake under Accel

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  • #1

    79 Special starting to Shake under Accel

    I get a strange Shaking feeling in the bike under load/ acceleration. around 40mph and up when on the throttle. It seems to go away if I pull in the clutch so I'm thinking it is drive line related rather than wheel bearing/chassis but I could be wrong. Is there any way to rule out Transmission, Clutch, Differential, etc? Any Help or suggestions are appreciated.

    Bike has about 28k miles on it.
    New Tires front and rear
    Never changed the wheel bearings.
    Never serviced the Middle or Differential drives.


    Thanks
    Mark
    XS11.Com resident Black Sheep
    Tags: None
  • #2
    Carefully pull back the boot around the driveshaft u-joint and check it for looseness; if the u-joint is going bad, that could be it...
    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

    • #3
      Same symptoms I had when my U-joint was bad. REALLY bad.
      Try your hardest to be the kind of person your dog thinks you are.

      You can live to be 100, as long as you give up everything that would make you want to live to be 100!

      Current bikes:
      '06 Suzuki DR650
      *'82 XJ1100 with the 1179 kit. "Mad Maxim"
      '82 XJ1100 Completely stock fixer-upper
      '82 XJ1100 Bagger fixer-upper
      '82 XJ1100 Motor/frame and lots of boxes of parts
      '82 XJ1100 Parts bike
      '81 XS1100 Special
      '81 YZ250
      '80 XS850 Special
      '80 XR100
      *Crashed/Totalled, still own

      Comment

      • #4
        Don't have that issue, but could one assume and make a mental note of that being a sign of a posible u-joint going array?
        81H Venturer1100 "The Bentley" (on steroids) 97 Yamaha YZ250(age reducer) 92 Honda ST1100 "Twisty"(touring rocket) Age is relative to the number of seconds counted 'airing' out an 85ft. table-top.

        Comment

        • #5
          did it start after you installed new tires?
          Don
          1979 XS1100SF "Old Man" bought by my Dad brand new in 79, customized in 80 with Vetter, Standard tank, and touring seat. I inherited in 02 when Dad passed. Been riding it since 09. No resto, bike is a survivor...

          2007 RoadStar 1700 Midnight Silverado "The Black Pearl" Cobra Slash-downs, K&N filter. More mods to come


          old:
          1989 kawi ex500
          1996 yzf-r6
          1999 yzf-r1
          2001 kawi zx-6r
          2000 Ducati 748
          2002 YZF-R1
          2005 V-Star 1100 Classic

          Comment

          • #6
            Just read this in your post..


            Never serviced the Middle or Differential drives.


            Have you even checked them? 28k miles and 30+ years, ya think it might be ready for an oil change in there?
            Try your hardest to be the kind of person your dog thinks you are.

            You can live to be 100, as long as you give up everything that would make you want to live to be 100!

            Current bikes:
            '06 Suzuki DR650
            *'82 XJ1100 with the 1179 kit. "Mad Maxim"
            '82 XJ1100 Completely stock fixer-upper
            '82 XJ1100 Bagger fixer-upper
            '82 XJ1100 Motor/frame and lots of boxes of parts
            '82 XJ1100 Parts bike
            '81 XS1100 Special
            '81 YZ250
            '80 XS850 Special
            '80 XR100
            *Crashed/Totalled, still own

            Comment

            • #7
              It would be a good idea to do a check/change on the MD/FD....... but if that's the vibration I don't think that will fix it...
              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
                I had a similar problem. I felt a vibration more on my feet than the whole bike and I only felt it when I jumped on the gas but mine was at higher speeds. I would get am increase in RPMs but no acceleration until I let off the throttle a little. Mine was the clutch slipping. All I needed to do was adjust the clutch cable and do the mechanical adjustment.

                I know your problem might be different but of you have any of the symptoms I had then I would check the clutch adjustment.
                USMC 2005 - Present

                79 XS1100F -Mileage unknown - Clubman bars, aftermarket headlight and speedometer, 4 into 1 straight through exhaust, TopCat's fuse box, 1980G rear fender - Daily driver - My first Motorcycle
                78 XS1100E - Rebuilt And Sold I SHOULD OF KEPT IT!!!

                Comment

                • #9
                  Originally posted by crazy steve View Post
                  It would be a good idea to do a check/change on the MD/FD....... but if that's the vibration I don't think that will fix it...


                  Agreed, and wasn't saying that would fix it, just that it needs to be done. I would suggest checking that the the drives aren't empty. Hate to see anyone with a middle drive lockup at speed. It tends to make new members of the "Over the Handlebars Club"
                  Try your hardest to be the kind of person your dog thinks you are.

                  You can live to be 100, as long as you give up everything that would make you want to live to be 100!

                  Current bikes:
                  '06 Suzuki DR650
                  *'82 XJ1100 with the 1179 kit. "Mad Maxim"
                  '82 XJ1100 Completely stock fixer-upper
                  '82 XJ1100 Bagger fixer-upper
                  '82 XJ1100 Motor/frame and lots of boxes of parts
                  '82 XJ1100 Parts bike
                  '81 XS1100 Special
                  '81 YZ250
                  '80 XS850 Special
                  '80 XR100
                  *Crashed/Totalled, still own

                  Comment

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