Standard Fork Question

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  • MPittma100
    XS-XJ Guru
    • Aug 2011
    • 2359
    • Atlanta, GA.
    #1

    Standard Fork Question

    I have noticed something interesting in the Yamaha factory service manuals. It concerns the amount of fork oil to be used when replacing the oil. They recommend a lesser amount for the E than the newer models. Newer models seem to require about an ounce more.

    Does anyone know the answer to this riddle?

    Mike
    1981 XS1100H Venturer
    K&N Air Filter
    ACCT
    Custom Paint by Deitz
    Geezer Rectifier/Regulator
    Chacal Stainless Steel Braided Brake Lines
    Chrome Front Rotor & Caliper Covers
    Stebel Nautilus Horn
    EBC Front Rotors
    Limie Accent Moves On In 2015

    Mike
    Tags: None
    • jetmechmarty
      Master of XSology
      • Nov 2003
      • 7769
      • Coldwater, Mississippi
      #2
      The Specials have longer forks.

      The air space on top of the oil is a tuning point for the front suspension. Air will compress; the oil will not.
      Marty (in Mississippi)
      XS1100SG
      XS650SK
      XS650SH
      XS650G
      XS6502F
      XS650E

        Comment

        • BA80
          Doctor of XSology
          • Oct 2010
          • 9980
          • Tulsa, Ok
          #3
          I've noticed that too Mike. The oil capacity is different from a SG to an SH but I can see no difference in the internals.

          My thinking is along the lines of what Marty said. More oil = stiffer ride.
          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

            • MarkD
              XStremely XSive
              • Jun 2013
              • 488
              • N. Michigan
              #4
              not sure about the others, but my '79F calls for 7.12 oz. of fork oil, I just did the old fork seal job.
              79 F
              Previously owned: (among others)
              1969 Harley- Davidson Rapido 125 (Aermacchi)
              1967 Suzuki X6 Hustler
              1973 Suzuki TM 125
              1979 XS1100 F
              2005 Kaw. Vulcan VN800
              1991 BMW K75

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