Would this fit?

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  • UK-GT
    • Feb 2026
    #1

    Would this fit?

    I have a 1981 GS650, would an exhaust from a GS550 fit it?
    Tags: None
    • Guest
      #2
      I'm not sure, but I have a 1980 550 and can take measurements if that would help.

        Comment

        • UK-GT
          #3
          Originally posted by steveb922
          I'm not sure, but I have a 1980 550 and can take measurements if that would help.
          That would be great thanks. Not sure what measurements I would need, but I presume center to center port spacing, center to center of the studs, I think on my 650 ports 1 & 4 are slightly angle out.

          Cheers

            Comment

            • Guest
              #4
              I'll go and take a look

                Comment

                • Guest
                  #5
                  Some quick measurements:-

                  Downpipe flange OD - 36mm
                  Stud centres - 62mm
                  Ports 1 - 2 and 3 - 4 - 88mm to centres
                  Ports 2 - 3 - 116mm to centres

                  Ports 1 and 4 slightly angled out

                  Caveat - the beer in the village inn was good last night. I'm happy to measure again if you think it's necessary!

                    Comment

                    • UK-GT
                      #6
                      http://www.thumbsnap.com/79UiHmNe
                      See photo. Its my spare head, sorry its a bit fury!!
                      Last edited by Guest; 12-08-2013, 08:05 AM.

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                        • Charlie G
                          Forum Guru
                          Past Site Supporter
                          Super Site Supporter
                          • Feb 2009
                          • 6440
                          • Siskiyou county
                          #7
                          I think I remember someone posting yesterday the the spacing is the same between the two engines but the diameter is different and won't seal up tight. Maybe a Seaking thread?

                          cg
                          sigpic
                          83 GS1100g
                          2006 Triumph Sprint ST 1050

                          Ohhhh!........Torque sweet Temptress.........always whispering.... a murmuring Siren

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                            • Nicholk
                              #8
                              Motad

                              Hi, I have my Motad 4-1 currently off my 550ET and can take photos with tape measure if you think it will be of any help.

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                                • Seaking
                                  #9
                                  Originally posted by Charlie G
                                  I think I remember someone posting yesterday the the spacing is the same between the two engines but the diameter is different and won't seal up tight. Maybe a Seaking thread? cg
                                  Not my thread, I'm following this one as well.. might be referring to it later

                                    Comment

                                    • UK-GT
                                      #10
                                      Originally posted by Nicholk
                                      Hi, I have my Motad 4-1 currently off my 550ET and can take photos with tape measure if you think it will be of any help.
                                      That would be great thank you as its a Motad I am looking at. I can get an exhaust in the UK for a 550 but not for a 650, I checked on the internet and according to the website there are only 2 GS650GTX 's on the road!!!!
                                      Last edited by Guest; 12-08-2013, 03:30 PM.

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                                        • tkent02
                                          Forum LongTimer
                                          Past Site Supporter
                                          • Jan 2006
                                          • 35571
                                          • Near South Park
                                          #11
                                          You can make a tube shaped spacer to make the 550 pipes fit the 650 ports, but as is they are a bit too narrow.
                                          http://img.photobucket.com/albums/v5...tatesMap-1.jpg

                                          Life is too short to ride an L.

                                            Comment

                                            • UK-GT
                                              #12
                                              Looks like my problem has been solved, just found a second hand Motad 4 into 1 made for a GS650 for ?35.

                                                Comment

                                                • Nicholk
                                                  #13
                                                  Motad

                                                  Congrats....trying to photograph mine was not proving easy...was gonna have to get assistance....glad I don't have to.
                                                  Good luck

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