Strange valve color

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  • aoywi
    • Mar 2026
    #1

    Strange valve color

    Hello :-)
    I took apart my cylinder on my GS450.
    I found that one of the four valves has an odd brown color.
    I am not sure why this is happening, but a guess would be that this valve is stuck, or not closing/opening properly.
    Any comments, og guesses ? :-)
    Thanks!

    2015-01-30 14.34.46.jpg
    Tags: cylinder head, valve
    • trippivot
      Forum Sage
      Past Site Supporter
      • Aug 2006
      • 2815
      • Des Moines , IA
      #2
      that is a good color for an exhaust valve -it is hotter than the intake and it should be. it shows proper heat and mostly complete burn. that is also why exhaust valve lash is wider than intake.
      SUZUKI , There is no substitute

        Comment

        • JEEPRUSTY
          #3
          looks normal to me

            Comment

            • Guest
              #4
              Yup looks fine to me as well.

                Comment

                • aoywi
                  #5
                  Well, that makes me fell embarrassed ;-)
                  Thank you very much for your help! :-)

                    Comment

                    • Nessism
                      Forum LongTimer
                      GSResource Superstar
                      Past Site Supporter
                      Super Site Supporter
                      • Mar 2006
                      • 35808
                      • Torrance, CA
                      #6
                      Since the head is off you might want to service everything and install new valve stem seals. Assuming the previous owner kept on top of valve adjustments you may not have to do much other than just clean everything and lap in the valves.
                      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

                        • aoywi
                          #7
                          Nessism
                          I was planning on replacing the valve stem seals, as they come with the gasket set i bought :-)
                          Do you think i need to lap the valves even when they are used ? :-)

                            Comment

                            • Nessism
                              Forum LongTimer
                              GSResource Superstar
                              Past Site Supporter
                              Super Site Supporter
                              • Mar 2006
                              • 35808
                              • Torrance, CA
                              #8
                              Originally posted by aoywi
                              Nessism
                              I was planning on replacing the valve stem seals, as they come with the gasket set i bought :-)
                              Do you think i need to lap the valves even when they are used ? :-)
                              Best thing to do is first remove the valves then inspect everything per the factory Suzuki service procedure. If everything checks out all you have to do is lightly lap the valves and reassemble. If the valves and seats are black and charred looking, you may need to have them professionally serviced before reassembly. Can't say for sure until you take it all apart.
                              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

                                • aoywi
                                  #9
                                  Originally posted by Nessism
                                  Best thing to do is first remove the valves then inspect everything per the factory Suzuki service procedure. If everything checks out all you have to do is lightly lap the valves and reassemble. If the valves and seats are black and charred looking, you may need to have them professionally serviced before reassembly. Can't say for sure until you take it all apart.
                                  Okay, guess i have something to do this weekend then ;-)
                                  Thanks a lot!

                                    Comment

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