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    Seal expanded after removal ...

    I have just removed all 4 carb to head boots
    and the seal has expanded so almost impossible to
    use again. Yes I could put in new seals but these
    are fine....just stretched it seems by compression.

    I have put them in the fridge overnight to see
    if they shrink.

    Any other ideas ? or do I just order more ....
    along with the cam cover gasket I need.
    (and yes I am as poor as can be to not want to
    buy more seals)

    20201112_144642_resize_53.jpg
    UKJULES
    ---------------------------------
    Owner of following bikes:
    1980 Suzuki GS550ET
    1977 Yamaha RD 250D
    1982 Kawasaki GPZ 750 R1
    1980 Suzuki GSX 250E

    #2
    Those o rings are really expensive for what they are. Sometimes they can expand as they've absorbed oil (maybe some got in from your oil leak). Try rubbing them with neat fairy liquid to pull out any contaminant then rinse, dry and place in the fridge.
    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


      #3
      Robert barr orings arent too pricy.


      your rings have absorbed either a petroleum distillate or alcohol etc
      id not refrigerate. id leave them to return to normal in a warm ventilated place.
      1983 GS 550 LD
      2009 BMW K1300s

      Comment


        #4
        They have absorbed gas. Put them in an oven at 175F or so and they should shrink back down. I did this with a fuel pump O-ring in my car. After an hour in the oven the O-ring was back to normal size.
        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


          #5
          That's a great site and information on it
          but alas they dont post outside usa.

          Mine are in perfect rubbery condition just
          expanded.
          Unfortunately they have been in my fridge overnight.
          after wiping down with brake / carb cleaner .

          I'll check how they fare this morning and if
          no good try some heat.
          UKJULES
          ---------------------------------
          Owner of following bikes:
          1980 Suzuki GS550ET
          1977 Yamaha RD 250D
          1982 Kawasaki GPZ 750 R1
          1980 Suzuki GSX 250E

          Comment


            #6
            Originally posted by ukjules View Post
            That's a great site and information on it
            but alas they dont post outside usa.
            (...)
            What? No. He (it's just one guy), just doesn't send fasteners outside the U.S. anymore, reasons outlined on his page. O-Rings are no problem.
            Last edited by roeme; 11-13-2020, 04:37 AM.
            #1: 1979 GS 550 EC "Red" – Very first Bike / Overhaul thread        New here? ☛ Read the Top 10 Newbie mistakes thread
            #2: 1978 GS 550 EC "Blue" – Can't make it a donor / "Rebuild" thread     Manuals (and much more): See Cliff's homepage here
            #3: 2014 Moto Guzzi V7 II Racer – One needs a runner while wrenching
            #4: 1980 Moto Guzzi V65C – Something to chill

            Comment


              #7
              Originally posted by ukjules View Post
              That's a great site and information on it
              but alas they dont post outside usa.
              I have purchased many O ring kits from Robert, no problem. Quick delivery from the USA too, usually around a week.
              1978 GS1085.

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

              Comment


                #8
                ok I'll add to my suppiers list


                Update on my carb boot to head seals.
                Leaving overnight in fridge after cleaning with
                carb/brake cleaner worked.

                They fit into recess and as still rubbery I'll
                use them.
                UKJULES
                ---------------------------------
                Owner of following bikes:
                1980 Suzuki GS550ET
                1977 Yamaha RD 250D
                1982 Kawasaki GPZ 750 R1
                1980 Suzuki GSX 250E

                Comment


                  #9
                  Robert is very helpful, I've bought many kits from him he sends them in very good time with helpful diagrams of which o' ring goes where.
                  sigpic

                  Don't say can't, as anything is possible with time and effort, but, if you don't have time things get tougher and require more effort.

                  Comment


                    #10
                    I dont suppose anyone knows where to get
                    a rubber grommet that goes on the wire
                    coming out of starter motor ?

                    Or is it really necessary ?
                    On my other engine they were both missing.
                    Anyone have a budget idea if it is necessary ?

                    (this now is the only issue with 2nd engine
                    install project)

                    20201113_145303_resize_22.jpg
                    UKJULES
                    ---------------------------------
                    Owner of following bikes:
                    1980 Suzuki GS550ET
                    1977 Yamaha RD 250D
                    1982 Kawasaki GPZ 750 R1
                    1980 Suzuki GSX 250E

                    Comment


                      #11
                      Originally posted by ukjules View Post
                      I dont suppose anyone knows where to get
                      a rubber grommet that goes on the wire
                      coming out of starter motor ?

                      Or is it really necessary ?
                      On my other engine they were both missing.
                      Anyone have a budget idea if it is necessary ?

                      (this now is the only issue with 2nd engine
                      install project)

                      [ATTACH=CONFIG]61967[/ATTACH]
                      That grommet is there to prevent chafing of the insulation from vibration. I guess it also keeps washing water from flooding the cavity before it can run out the mystery hole. I'd take some rubber hose/gas line and open it up. Slide it over and fix it with some silicone. There's only electrons present when the starter is operating so there's no risk of shorts anyway while riding.
                      '82 GS450T

                      Comment


                        #12
                        Find one in a rubber grommet shop easily enough.
                        Problem is, all the small local electronic suppliers have disappeared, and that's exactly the kind of thing they used to have boxes of.
                        Hit up your nearest City Electrical Factors or similar electrical wholesale place and they might have something like that.
                        ---- Dave
                        79 GS850N - Might be a trike soon.
                        80 GS850T Single HIF38 S.U. SH775, Tow bar, Pantera II. Gnarly workhorse & daily driver.
                        79 XS650SE - Pragmatic Ratter - goes better than a manky old twin should.
                        92 XJ900F - Fairly Stock, for now.

                        Only a dog knows why a motorcyclist sticks his head out of a car window

                        Comment


                          #13
                          Good idea ... tis finding em though .
                          Will do so though.

                          Gonna have to think out of the box ....
                          I'm sure I read a thread somewhere re alternate items ....
                          UKJULES
                          ---------------------------------
                          Owner of following bikes:
                          1980 Suzuki GS550ET
                          1977 Yamaha RD 250D
                          1982 Kawasaki GPZ 750 R1
                          1980 Suzuki GSX 250E

                          Comment


                            #14
                            It's easy enough to make an erzatz grommet for a hole in a panel by simply stripping some insulation from a twin & earth cable and bend it into around the hole.
                            In the situation you have there, not sure if it would stay in place.
                            ---- Dave
                            79 GS850N - Might be a trike soon.
                            80 GS850T Single HIF38 S.U. SH775, Tow bar, Pantera II. Gnarly workhorse & daily driver.
                            79 XS650SE - Pragmatic Ratter - goes better than a manky old twin should.
                            92 XJ900F - Fairly Stock, for now.

                            Only a dog knows why a motorcyclist sticks his head out of a car window

                            Comment

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