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gs450 bearing color codes - My Suzi has guts

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    gs450 bearing color codes - My Suzi has guts

    Hello GS forum members!
    My name is Jim
    I have a 1980 gs450L

    Does anyone know how to use the color coded bearing chart?

    On my Crankcase A B
    AAAA

    Counter shaft has a B on right side,

    No other letters on balance shaft.

    Crankshaft has B B C B from let to right

    Rods and rod journals both have 2 on them.

    20190820_115030.jpg

    I could post video with juicy close-ups of the journals if it helps... Thanks, Jim
    Last edited by Guest; 08-20-2019, 05:06 PM.

    #2
    Have you looked in the manual from Basscliff's website?

    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

    Comment


      #3
      Are you sure you need to do this? Plain bearing procurement is tricky. Hopefully, member Pete from the land down under will surface.
      1981 gs650L

      "We are all born ignorant, but you have to work hard to stay stupid" Ben Franklin

      Comment


        #4
        Yes, I have Clymer and micrometers.
        A little scetchy on the color codes.
        Thanks

        Comment


          #5
          Not sure at all.
          There is a bit of side to side in the crankshaft and I can feel a bit of clunk in the mains as well.
          I can see wear on the bearings.
          Now I have found almost all the numbers I might have it figured out.

          Comment


            #6
            Do yourself a favor and download the service manual. That should be the first place you turn then go to the Clymers if necessary as the Clymers is known to have mistakes in them.
            sigpic
            Cowboy Up or Quit. - Run Free Lou and Rest in Peace

            1981 GS550T - My First
            1981 GS550L - My Eldest Daughter's
            2007 GSF1250SA Bandit - My touring bike

            Sit tall in the saddle Hold your head up high
            Keep your eyes fixed where the trail meets the sky and live like you ain't afraid to die
            and don't be scared, just enjoy your ride - Chris Ledoux, "The Ride"

            Comment


              #7
              Originally posted by gsjames View Post
              Not sure at all.
              There is a bit of side to side in the crankshaft and I can feel a bit of clunk in the mains as well.
              I can see wear on the bearings.
              Now I have found almost all the numbers I might have it figured out.
              If by side to side you mean endplay - in and out - the usual figure is about .010 [limit .015??] but I can't find the reference to that with a quick look at the factory manual. This may seem loose, but the cases will expand when hot and the clearance will drop as the case expands faster than the steel crank. The thrust bearings are easy to replace if they're worn past the limit of 2.85 mm thick.

              I'd suspect that GS500 bearings would be the same thing as 450. Probably updated numbers by now.... Don't overlook the balance shaft bearings which are same as mains.
              '82 GS450T

              Comment


                #8
                Well on those codes, your mains should be, black, black,brown and black. You're missing a code on the balancer shaft.
                The endfloat limit is not quoted but the thrust bearing thickness is - 2.85mm or .112in.

                If you have it apart, I'd get the shaft linished. This is not a grinding process, it's a polishing one. Removes any tiny imperfections.
                Any car engine reconditioner should be able to do this quite cheaply.

                And yeah, download the manual.

                Comment


                  #9
                  My Clymer states crankshaft runout 0.05mm or 0.0020 in,
                  My crank appearrs to have more.
                  Still can't find another mark on the balance shaft. Micrometer says 1.2598 and the case is an A, so I am thinking "Green"
                  Linished sounds good to me. I see some normal wear.
                  Thanks

                  Comment


                    #10
                    Originally posted by cowboyup3371 View Post
                    Do yourself a favor and download the service manual. That should be the first place you turn then go to the Clymers if necessary as the Clymers is known to have mistakes in them.
                    I did download a manual from bikecliff. Is that where I get the "service manual"?

                    Comment


                      #11
                      Basscliff only has the Clymer for the 450. It's the one chink in the GS manual armor since no factory manual download is available.
                      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

                      Comment


                        #12
                        Thanks Guys!
                        I feel like I know 100% more about this today.
                        My plan is to get the parts ordered and paint the frame.
                        I have the carbs done and the head and jugs as well.
                        I will post it on the bike builds forum soon.
                        20190820_114749.jpg

                        Comment


                          #13
                          I have a re-print of the genuine factory manual here, I'll try to remember to have a look tonight and see what I can find that's helpful. My motor was ok when I pulled it apart so I didn't have to worry about bearings etc. at the time.
                          1982 GS450E - The Wee Beastie
                          1984 GSX750S Katana 7/11 - Kit Kat - BOTM May 2020

                          sigpic

                          450 Refresh thread: https://www.thegsresources.com/_foru...-GS450-Refresh

                          Katana 7/11 thread: http://www.thegsresources.com/_forum...84-Katana-7-11

                          Comment


                            #14
                            This is what old bearings look like.
                            The hard shiny coating on the aluminum bearing is wearing off.
                            20190823_121727.jpg
                            30 - 40,000 miles on the bike.

                            Comment


                              #15
                              Wow someone hasn't maintained that! Mine had 96,000kms when I pulled it down (which ended up not being necessary... long story) and it was like new inside.

                              Apologies, I owe you some info from the factory manual which I will dig out this weekend for you, been a little otherwise occupied this week!
                              1982 GS450E - The Wee Beastie
                              1984 GSX750S Katana 7/11 - Kit Kat - BOTM May 2020

                              sigpic

                              450 Refresh thread: https://www.thegsresources.com/_foru...-GS450-Refresh

                              Katana 7/11 thread: http://www.thegsresources.com/_forum...84-Katana-7-11

                              Comment

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