Can I file down .50 over rings?

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  • Macmatic
    • Feb 2026

    #1

    Can I file down .50 over rings?

    I know... I know... but are .50 over rings anything but bigger, longer curved strips? I can get a deal on oversized rings.

    /\/\ac
  • rapidray
    Forum Guru
    GSResource Superstar
    • Oct 2006
    • 8195
    • So Cal

    #2
    They will put too much pressure on the cylinder walls & wreck them. Ray.

    Comment

    • Macmatic

      #3
      Thanks Ray!

      Comment

      • Guest

        #4
        Machine your cylinders over.
        Last edited by Guest; 07-10-2009, 03:49 PM.

        Comment

        • Suzuki_Don

          #5
          And buy new pistons.

          Comment

          • Macmatic

            #6
            I'd love to!

            Send me $600.

            Comment

            • doctorgonzo

              #7
              Stock rings (in my experience) always seeem harder to find than oversize.

              Comment

              • trippivot
                Forum Sage
                Past Site Supporter
                • Aug 2006
                • 2815
                • Des Moines , IA

                #8
                good god what are you thinking??

                NO!
                SUZUKI , There is no substitute

                Comment

                • Macmatic

                  #9
                  Originally posted by trippivot
                  good god what are you thinking??

                  NO!
                  Ray had this one covered.

                  I was thinking that shortening the overall length of the rings by adjusting the endgap might allow .50 over rings to work in a stock bore. Times are tight and I'm adding 1/2 a quart every 150-200 miles on average lately. Pretty sure its the rings and not (just) the valve stem seals.


                  There is one lot of four sets of NOS GS750 .5 over rings on ebay right now for $25



                  Not actually sure if those are even for the 83-85 bikes but it would have been worth asking if I could have used them.

                  /\/\ac

                  Comment

                  • trippivot
                    Forum Sage
                    Past Site Supporter
                    • Aug 2006
                    • 2815
                    • Des Moines , IA

                    #10
                    shorten the ends and compress a ring that makes an oval not a circle

                    I think this needed some emphasis it was not a stupid question you asked, but c'mon.!

                    you'd need a hammer to get them in there. and then where would you be.
                    a half millimeter is a mile in this area.
                    SUZUKI , There is no substitute

                    Comment

                    • hampshirehog
                      Forum LongTimer
                      Past Site Supporter
                      • Oct 2007
                      • 12675
                      • Hampshire. UK

                      #11
                      This is standard fare on old British stuff - but we're talking waaay different tolerances here so the guys above have got it right.
                      79 GS1000S
                      79 GS1000S (another one)
                      80 GSX750
                      80 GS550
                      80 CB650 cafe racer
                      75 PC50 - the one with OHV and pedals...
                      75 TS100 - being ridden (suicidally) by my father

                      Comment

                      • flyingace

                        #12
                        Are any of these opinions backed up by facts? I mean it doesn't sound like a good idea, but has anyone actually tried this and seen the results? Maybe it would work just fine.

                        Comment

                        • hampshirehog
                          Forum LongTimer
                          Past Site Supporter
                          • Oct 2007
                          • 12675
                          • Hampshire. UK

                          #13
                          Originally posted by flyingace
                          Are any of these opinions backed up by facts? I mean it doesn't sound like a good idea, but has anyone actually tried this and seen the results? Maybe it would work just fine.
                          Old skinflint me didn't listen and tried it years ago (750 Honda I think -being brought up on British bikes I thought it was a load of b*llsh*t). Wears the bores almost as quickly as pouring rocks through the plug hole.

                          The exception here I believe is that 1mm OS 850 rings fit a 1000 as they are the same (before anyone goes down that route will somebody back me up or tell me I'm wrong - I'm working from adled memory here)
                          79 GS1000S
                          79 GS1000S (another one)
                          80 GSX750
                          80 GS550
                          80 CB650 cafe racer
                          75 PC50 - the one with OHV and pedals...
                          75 TS100 - being ridden (suicidally) by my father

                          Comment

                          • Macmatic

                            #14
                            Thanks, everyone, for your input. I ask my share of boneheaded questions and a few good ones too. One of these days someone (probably me) is going to figure out there is a search option and find out this info before they f'up their own bike.


                            Now when can I expect that $600 so I can go out and get my oversize pistions?

                            /\/\ac

                            Comment

                            • twiggy2cents

                              #15
                              Originally posted by Macmatic
                              Thanks, everyone, for your input. I ask my share of boneheaded questions and a few good ones too. One of these days someone (probably me) is going to figure out there is a search option and find out this info before they f'up their own bike.


                              Now when can I expect that $600 so I can go out and get my oversize pistions?

                              /\/\ac

                              i will send you a western union money order for 1100 dollars you keep the 600 dollars plus 200 for your troubles and send the rest back.


                              Kay?

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