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    disc warpage

    how much run out is acceptable on a floating disc before a replacement is required?
    1978 GS1085.

    Just remember, an opinion without 3.14 is just an onion!

    #2
    I don't remember what the manual says, but how does it feel in use?
    1983 GS850G, Cosmos Blue.
    2005 KLR685, Aztec Pink - Turd II.3, the ReReReTurdening
    2015 Yamaha FJ-09, Magma Red Power Corrupts...
    Eat more venison.

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      #3
      GS discs are not floating. Are you planning to switch rotors and/or front wheels?

      According to the factory service manual for the GS1000, the allowance is .012" runout on the front disc. I think this is too much though; had a 550 and the front disc was .008" out and the brakes felt horrible (too much pulsation). Replaced that disc with one that measured .002" and the brakes felt good. Guess I'm suggesting something in the range of .002 - .004 or so should be OK.
      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

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        #4
        Originally posted by Nessism View Post
        GS discs are not floating. Are you planning to switch rotors and/or front wheels?

        According to the factory service manual for the GS1000, the allowance is .012" runout on the front disc. I think this is too much though; had a 550 and the front disc was .008" out and the brakes felt horrible (too much pulsation). Replaced that disc with one that measured .002" and the brakes felt good. Guess I'm suggesting something in the range of .002 - .004 or so should be OK.
        it is a floating disc, i have a gs500 front wheel with a RF900 disc on it.
        not actually ridden with it yet as i just bought it and fitted it but there is about 1mm runout on it. dont know if this is acceptable with a floater!
        Last edited by Agemax; 02-01-2009, 10:51 AM.
        1978 GS1085.

        Just remember, an opinion without 3.14 is just an onion!

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          #5
          1mm of runout doesn't sound good at all. Floating discs are able to move side to side slightly but they should not wobble.
          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

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            #6
            i thought it may be a bit excessive, even for a floating disc
            1978 GS1085.

            Just remember, an opinion without 3.14 is just an onion!

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              #7
              I like to use a flat surface or straight edge and a feeler gauge on floaters.

              they have 40~60 thou play or more normal. hence the term floating. hope your caliper is not a floater too.

              one side or the other needs to be fixed stationary. dual floating mixmatch is a recipe for disaster.
              SUZUKI , There is no substitute

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                #8
                the caliper is not a floater, i dont think. its off a kawasaki zx9r. no silly sliding pins etc, just solidly bolts to the mount. (when i make it!)
                1978 GS1085.

                Just remember, an opinion without 3.14 is just an onion!

                Comment


                  #9
                  excellent!
                  SUZUKI , There is no substitute

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