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
  • jetmechmarty
    Master of XSology
    • Nov 2003
    • 7765
    • 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

        Comment

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