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Thread size and pitch of '81 GS750 swing arm bolt?

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    #1

    Thread size and pitch of '81 GS750 swing arm bolt?

    Does anyone know? Nut is no good...will order a new one I suppose. I picked up a 12mm x 1.5 pitch die to repair the first few threads of the bolt but not sure if that's the correct pitch...definitely not 1.75 pitch. Also, I see the nut on partzilla (bolt is obsolete). Any other recommendations for place to buy parts. I saw some used bolts and nuts on eBay if all else fails.
    Thanks.
    Tags: None
    #2
    12mm fasteners on a GS are normally 1.25mm pitch.
    1983 GS850G, Cosmos Blue.
    2005 KLR685, Aztec Pink - Turd II.3, the ReReReTurdening
    2015 Yamaha FJ-09, Magma Red Power Corrupts...
    Eat more venison.

    Please provide details. The GSR Hive Mind is nearly omniscient, but not yet clairvoyant.

    Celeriter equita, converteque saepe.

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    Comment

      #3
      Originally posted by bwringer View Post
      12mm fasteners on a GS are normally 1.25mm pitch.
      guess i should have measured the thread first...seems it's 14mm...need to have my eyes recalibrated

      Comment

        #4
        You will likely have better luck cleaning up the threads on the bolt with a metric thread file -- it's too easy to get a large fine pitch die cross-threaded and make a real mess.
        Last edited by bwringer; 02-06-2017, 07:11 PM.
        1983 GS850G, Cosmos Blue.
        2005 KLR685, Aztec Pink - Turd II.3, the ReReReTurdening
        2015 Yamaha FJ-09, Magma Red Power Corrupts...
        Eat more venison.

        Please provide details. The GSR Hive Mind is nearly omniscient, but not yet clairvoyant.

        Celeriter equita, converteque saepe.

        SUPPORT THIS SITE! DONATE TODAY!

        Get "The Riding Obsession" sport-touring motorcycling podcast at https://tro.bike/podcast/ or wherever you listen to podcasts!

        Comment

          #5
          Do you have a thread file? Sometimes careful use of one can restore the threads enough to use the right die, unless the bolt (or axle) is severely 'mushroomed'. Also handy for determining thread pitch-
          Last edited by recycled64; 02-06-2017, 07:11 PM.
          sigpicSome of the totally committed probably should be.
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          '71 Kaw. A1-ugh ('71 SF, CA- worked @ Kaw dlr)
          '66 Yam. YL1('72 SF-commuter beater)
          '73 Kaw. S2A-2Xugh ('73 SF-still parts slave)
          '78 GS 750C ('77 SF-old faithful-killed by son)
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          '81 GS 650G ('08 back to NE&ME- (project)
          '82 GS '82 (2) GS650GZ, L, Middlebury, G current

          Comment

            #6
            Originally posted by recycled64 View Post
            Do you have a thread file? Sometimes careful use of one can restore the threads enough to use the right die, unless the bolt (or axle) is severely 'mushroomed'. Also handy for determining thread pitch-
            Looks like great minds think alike....
            1983 GS850G, Cosmos Blue.
            2005 KLR685, Aztec Pink - Turd II.3, the ReReReTurdening
            2015 Yamaha FJ-09, Magma Red Power Corrupts...
            Eat more venison.

            Please provide details. The GSR Hive Mind is nearly omniscient, but not yet clairvoyant.

            Celeriter equita, converteque saepe.

            SUPPORT THIS SITE! DONATE TODAY!

            Get "The Riding Obsession" sport-touring motorcycling podcast at https://tro.bike/podcast/ or wherever you listen to podcasts!

            Comment

              #7
              Originally posted by bwringer View Post
              You will likely have better luck cleaning up the threads on the bolt with a metric thread file -- it's too easy to get a large fine pitch die cross-threaded and make a real mess.
              Can't believe i made it this far in life without using a thread file. So i watched a youtube video and now i am armed with more knowledge. I may even have a thread file (although probably not metric)...I never really looked closely at it so i assumed it was a broaching tool of some sort. Anyway, i ordered the nut cuz it was FUBAR, the thread on the bolt doesn't look too messed up but if the nut has any resistance going on i will fix the thread with a thread file.

              Good way to start the day with a little enlightenment...thanks!

              Comment

                #8
                Look what I found in the broach tool box!...now to figure out what pitch the bolt is.
                Attached Files

                Comment

                  #9
                  Originally posted by gregp View Post
                  Look what I found in the broach tool box!...now to figure out what pitch the bolt is.
                  Awesome!

                  Geez, I don't even have a broach box...

                  Anyhoo, the 1.5 or 1.25 showing on the file will be it. I think for 14mm it'll be 1.5, but you'll be able to tell by seeing which thread file teeth mate up.
                  1983 GS850G, Cosmos Blue.
                  2005 KLR685, Aztec Pink - Turd II.3, the ReReReTurdening
                  2015 Yamaha FJ-09, Magma Red Power Corrupts...
                  Eat more venison.

                  Please provide details. The GSR Hive Mind is nearly omniscient, but not yet clairvoyant.

                  Celeriter equita, converteque saepe.

                  SUPPORT THIS SITE! DONATE TODAY!

                  Get "The Riding Obsession" sport-touring motorcycling podcast at https://tro.bike/podcast/ or wherever you listen to podcasts!

                  Comment

                    #10
                    Haha, someone thought those were broaches. Good find!��

                    Also, if you have a Broach box.I think you'll be able to figure out what thread pitch you have...
                    Last edited by storm 64; 02-07-2017, 03:42 PM.
                    My Motorcycles:
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                    79 1000e (all original)
                    82 850g (all original)
                    80 KZ 650F (needs restored)

                    Comment

                      #11
                      Originally posted by bwringer View Post
                      Awesome!

                      Geez, I don't even have a broach box...

                      Anyhoo, the 1.5 or 1.25 showing on the file will be it. I think for 14mm it'll be 1.5, but you'll be able to tell by seeing which thread file teeth mate up.
                      Ok... I'll start there...I probably have a thread gauge (or two)....i'll look in the dial indicator box!

                      Comment

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