Performance cam ID

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  • 4cyl h2
    • Jan 2026
    #1

    Performance cam ID

    Found out I've got a set of gs1150 cams marked yrd. St 1. Wondering if anybody knows for sure what they are. With 0 lash lift on the dial is showing right at 320 on both cams. Haven't measured duration yet took measure with a standard Gs1100 rocker arm
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    • Nessism
      Forum LongTimer
      GSResource Superstar
      Past Site Supporter
      Super Site Supporter
      • Mar 2006
      • 35783
      • Torrance, CA
      #2
      Some photos of the markings would help.
      Ed

      To measure is to know.

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        Comment

        • posplayr
          Forum LongTimer
          GSResource Superstar
          Past Site Supporter
          • Dec 2007
          • 23673
          • Tucson Az
          #3
          In school I had a teacher who would give all the time you needed in a test. It was open book as well because that is the way the real world was. However, if you wrote a number down without units it was wrong and marked as wrong.

          Is 320 duration in Deg, Or milli radians of lash? How much the cams weigh in Deci-lbs? or what.


          1150 stock lift is Intake 0.315"(8.0mm) and Exhaust is 0.295"(7.5mm)


          GS/GSXR 16V Valve Lift/Diameter - The GSResources Forums
          http://www.thegsresources.com/_forum/showthread.php?140749-GS-GSXR-16V-Valve-Lift-Diameter&highlight=value+lift
          Technical Info posts that are deemed to be important or popular will be placed here for easier access. If you feel a post should be moved from the Technical Info forum to here then PM the Administrator with your request.

            Comment

            • Guest
              #4
              yrd might be Yoshimura Research and Development.

                Comment

                • rapidray
                  Forum Guru
                  GSResource Superstar
                  • Oct 2006
                  • 8195
                  • So Cal
                  #5
                  Those are Yoshimura Stage 1 cams.
                  Ray.

                    Comment

                    • 4cyl h2
                      #6
                      Originally posted by rapidray
                      Those are Yoshimura Stage 1 cams.
                      Ray.
                      Thanks ray. Any chance you know the listed specs. I'm gonna guess just mild drop ins

                        Comment

                        • rapidray
                          Forum Guru
                          GSResource Superstar
                          • Oct 2006
                          • 8195
                          • So Cal
                          #7
                          I believe they were .335 lift & 248 duration.

                            Comment

                            • 4cyl h2
                              #8
                              Originally posted by rapidray
                              I believe they were .335 lift & 248 duration.
                              jay thanks for the tip looks like you were correct

                              ray thanks for confirming and the cam info

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