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Helicoil for oil drain bolt on a 1983 GS450E?

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    Helicoil for oil drain bolt on a 1983 GS450E?

    My oil drain threads are stripped! What Helicoil and tap should I use for the factory bolt?

    #2
    I would not use a Heli-Coil for the drain plug. You can go to your favorite auto parts store and get an oversize plug. I think it's an M14x1.25, but measure to be sure. The oversize plugs come in a +1 size or a +2 size. If your stripped plug (likely the oil pan, not the plug) still has a little "bite" to it, get the +1. If you can keep spinning it with your fingers, get the +2.

    Oh, and if you DID use a Heli-Coil, it usually comes with its own special tap. It's a size that is not available anywhere else.
    Last edited by phydeauxmutt; 04-25-2022, 11:04 PM.

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      #3
      How does the oversize plug work? Do you just torque it in there without tapping anything and call it a day?

      Also, is there a reference for the torque settings I should be using throughout this bike? The Haynes manual is severely lacking this stuff

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        #4
        I'm having a hard time finding an oversize M14-1.25 bolt. Got a link to something I can buy by chance?

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          #5
          Oh you know what? A while back, I had a car where a spark plug came loose and stripped its own threads, and I still have the kit. The thread size is M14-1.25! I already have all the tools and extra inserts from this kit. I think I might go ahead and just use this kit one more time. It'll have a nice steel thread that shouldn't give me issues or need a special bolt.

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            #6
            https://www.amazon.com/Dorman-65217-.../dp/B000COCX0E

            Pretty hard not to find it with a google search to be honest.....

            https://lmgtfy.app/?q=m14+oversized+drain+plug

            1980 GS1000G - Sold
            1978 GS1000E - Finished!
            1980 GS550E - Fixed & given to a friend
            1983 GS750ES Special - Sold
            2009 KLR 650 - Sold - gone to TX!
            1982 GS1100G - Rebuilt and finished. - Sold

            www.agadisplay.com
            www.parasiticsanalytics.com

            TWINPOT BRAKE UPGRADE LINKY: http://www.thegsresources.com/_forum...e-on-78-Skunk/

            Comment


              #7
              Originally posted by Synthead View Post
              I'm having a hard time finding an oversize M14-1.25 bolt. Got a link to something I can buy by chance?
              https://www.autozone.com/external-en...ize+drain+plug

              https://www.oreillyauto.com/search?q=overize+drain+plug

              https://shop.advanceautoparts.com/we...0051&langId=-1

              https://www.amazon.com/s?k=oversize+..._ts-doa-p_1_19

              The list goes on.

              And on.

              Check your current bolt with a thread gauge. It MIGHT be M14-1.50.

              Comment


                #8
                Originally posted by salty_monk View Post
                https://www.amazon.com/Dorman-65217-.../dp/B000COCX0E

                Pretty hard not to find it with a google search to be honest.....

                https://lmgtfy.app/?q=m14+oversized+drain+plug
                This is m14-1.5, not M14-1.25

                • That's 1/2"-20
                • There are no M14-1.25 bolts in that list
                • There are no M14-1.25 bolts in that list, either
                • Amazon has a M14-1.25, but it isn't oversize
                It is M14-1.25.
                Last edited by Synthead; 04-26-2022, 09:18 PM.

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                  #9
                  It cuts new threads so I don't think it matters if it's 1.25 or 1.5.... There are a bunch of threads on it here for people that have had success. Do some searching.
                  1980 GS1000G - Sold
                  1978 GS1000E - Finished!
                  1980 GS550E - Fixed & given to a friend
                  1983 GS750ES Special - Sold
                  2009 KLR 650 - Sold - gone to TX!
                  1982 GS1100G - Rebuilt and finished. - Sold

                  www.agadisplay.com
                  www.parasiticsanalytics.com

                  TWINPOT BRAKE UPGRADE LINKY: http://www.thegsresources.com/_forum...e-on-78-Skunk/

                  Comment


                    #10
                    Having had to do this job myself, may I strongly suggest removing the oil pan and being very careful to ensure that the resulting thread is fully perpendicular to the pan surface. I mistakenly had the angle slightly off and wound up having to machine out the crap threads, and insert an...insert, threaded and properly perpendicular.

                    Turning a drill press by hand will work just fine.
                    Last edited by free99; 05-01-2022, 08:19 PM. Reason: Added actual solution
                    1982 GS 450L aka Lil' Red
                    1980 GS 1000G aka Big Red (Resto-mod WIP)

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                      #11
                      I ended up using extra parts from my spark plug thread repair kit I bought a while back. It turned out great! I used high-temp RTV sealant on the threads to ensure that it wouldn't leak. Not that the crush washer wouldn't seal that, anyway.

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