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  • fix bent fork?

    One fork has a slight bend it... looks to be about 1/16" to light 1/8" at the most when slowing rolling it on a flat surface so I am wondering if it is necessary to get it straightened?
    1980 XS1100SG
    1998 KLR 650

  • #2
    I would replace it myself. Fix it as a last resort. The forks are far too important for proper suspension and handling to be trusting something bent. While the bend in the forks may be small the damages could be huge if you lose handling at the wrong moment.
    2-79 XS1100 SF
    2-78 XS1100 E Best bike Ever
    80 XS 1100 SG Big bore kit but not fully running yet.
    Couple of more parts bikes of which 2 more will live!

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    • #3
      I agree, find a replacement.
      Nathan
      KD9ARL

      μολὼν λαβέ

      1978 XS1100E
      K&N Filter
      #45 pilot Jet, #137.5 Main Jet
      OEM Exhaust
      ATK Fork Brace
      LED Dash lights
      Ammeter, Oil Pressure, Oil Temp, and Volt Meters

      Green Monster Coils
      SS Brake Lines
      Vision 550 Auto Tensioner

      In any moment of decision the best thing you can do is the right thing, the next best thing is the wrong thing, and the worst thing you can do is nothing.

      Theodore Roosevelt

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      • #4
        I was hoping to hear something different... my hatred for deer is growing. Looks like it's time to spend some more money. Any difference between the years/models?
        Last edited by thebottle; 03-19-2011, 03:28 PM.
        1980 XS1100SG
        1998 KLR 650

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        • #5
          The Standards are different than the Specials. But I am certain all the Specials work interchangably and fairly certain the Standards are the same.

          Look on Fleabay, or find someone parting a bike out on here.
          Life is what happens while your planning everything else!

          When your work speaks for itself, don't interrupt.

          81 XS1100 Special - Humpty Dumpty
          80 XS1100 Special - Project Resurrection


          Previously owned
          93 GSX600F
          80 XS1100 Special - Ruby
          81 XS1100 Special
          81 CB750 C
          80 CB750 C
          78 XS750

          Comment


          • #6
            Originally posted by thebottle View Post
            I was hoping to hear something different
            Many people have had success straightening fork stanchions. Do a Google search on the subject. Max run out should be no more than 5 thou.
            2H7 (79) owned since '89
            3H3 owned since '06

            "If it ain't broke, modify it"

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            • #7
              Specials are all the same, and standards are different than specials and are almost the same as each other but slightly different from each other based on early and late with some minor differences. The early standards use different progressive rate springs vs the straight rate springs of the late model standard air forks. Also the caps are different between the two although the caps will interchange, but since the spring rates are different the two sides on the standards need to be a match (the air version are designed to have air carry part of the load unlike the early models which use the springs to carry all the load).

              That of course does not apply to your special, so any special forks should work for you, and I believe that I have seen special forks easier to find on ebay that later standard forks are to find (I know cause I had to find a set for mine).
              Cy

              1980 XS1100G (Brutus) w/81H Engine
              Duplicolor Mirage Paint Job (Purple/Green)
              Vetter Windjammer IV
              Vetter hard bags & Trunk
              OEM Luggage Rack
              Jardine Spaghetti 4-2 exhaust system
              Spade Fuse Box
              Turn Signal Auto Cancel Mod
              750 FD Mod
              TC Spin on Oil Filter Adapter (temp removed)
              XJ1100 Front Footpegs
              XJ1100 Shocks

              I was always taught to respect my elders, but it keeps getting harder to find one.

              Comment


              • #8
                To straighten the fork tubes; you will need an arbor press and some V-blocks. A hydralic press is not recommended because you don't have the control and feel needed.

                To check to see if they are straight you will need a dial indicator and a lathe.

                Disassemble the forks down to the bare tubes.

                Place the fork tube in the V-blocks and use the press to push on the high side. Make sure you have a v-block on top to so you dont put a ding in the tube. It doesn't take much so try not to go too far. You can check you work with a straight edge.

                Once you think you have got it put them in the lathe and check with the dial indicator. You can skip this if you trust your eyeball and a flat surface, just roll the tube.

                I have straightened tubes on 3 bikes and never had a problem.
                '79 XS1100F
                '66 FLH
                '73 FX
                '03 FLHTI
                '97 Ural

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                • #9
                  Yeah, I decided to get it straightened... there is a hydraulic repair shop near me that straightens hydraulic cylinders and they said they would do it for $25.
                  1980 XS1100SG
                  1998 KLR 650

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