Why the half moons?

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  • jrobert94
    • Feb 2026

    #1

    Why the half moons?

    Anyone know the purpose of the half moon cam end plugs? Other than obviously to fill the half moon shaped hole in the head i mean why would it be designed like that in the first place? Seems like it's just more production expense and unnecessary parts expense (however minimal)
  • tkent02
    Forum LongTimer
    Past Site Supporter
    • Jan 2006
    • 35571
    • Near South Park

    #2
    That's how they bore the cam journals. Welding them up afterwards would be a lot more expensive, as would inventing a big drill that goes around corners.
    http://img.photobucket.com/albums/v5...tatesMap-1.jpg

    Life is too short to ride an L.

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    • Nessism
      Forum LongTimer
      GSResource Superstar
      Past Site Supporter
      Super Site Supporter
      • Mar 2006
      • 35790
      • Torrance, CA

      #3
      Class is now in session...

      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

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      • jrobert94

        #4
        Wow, i can't believe i never noticed that. Duh.

        Comment

        • jrobert94

          #5
          Mechanically declined? That's a bit harsh don't ya think?

          Comment

          • tkent02
            Forum LongTimer
            Past Site Supporter
            • Jan 2006
            • 35571
            • Near South Park

            #6
            Originally posted by jrobert94
            Mechanically declined? That's a bit harsh don't ya think?
            You think that was harsh, tell him you prefer to ride without mufflers.
            http://img.photobucket.com/albums/v5...tatesMap-1.jpg

            Life is too short to ride an L.

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            • Nessism
              Forum LongTimer
              GSResource Superstar
              Past Site Supporter
              Super Site Supporter
              • Mar 2006
              • 35790
              • Torrance, CA

              #7
              Originally posted by jrobert94
              Mechanically declined? That's a bit harsh don't ya think?
              Sorry man, just a little tease is all.

              Oh, and while we are conversing, how about telling me about your bikes exhaust?
              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

              • jrobert94

                #8
                It's alright. I just always thought the cam journals were end-milled, from the top of the head, not drilled from the side.
                Strong opinions on exhaust huh? I have the stock exhaust on my bike. And the stock airbox too, since those questions always seem to come in quick succession lol.
                My exhaust is a little ratty-looking though and i was thinking i might replace it soon. You gonna bite my head off if i ask your opinions on aftetmarket exhaust? With muffler(s) of course.

                Comment

                • Griffin
                  Forum LongTimer
                  Past Site Supporter
                  • Sep 2003
                  • 14205
                  • Danville, IN

                  #9
                  Originally posted by jrobert94
                  It's alright. I just always thought the cam journals were end-milled, from the top of the head, not drilled from the side.
                  Strong opinions on exhaust huh? I have the stock exhaust on my bike. And the stock airbox too, since those questions always seem to come in quick succession lol.
                  My exhaust is a little ratty-looking though and i was thinking i might replace it soon. You gonna bite my head off if i ask your opinions on aftetmarket exhaust? With muffler(s) of course.
                  Ed (and Tom, and I, and many others on this site) are completely cool with an aftermarket exhaust on a motorcycle, so long as it still has the baffles and packing. I've got a couple bikes with them myself.

                  It's the open exhaust guys (or, worse yet, the jokers who cut the four exhaust pipes off at the junction under the bike) who draw our ire. One, because they then complain that the bike doesn't run right. Two, because the bike is louder than Hell and disturbs everyone within a quarter mile of the farting, belching beast that they just ruined.
                  GS450E GS650E GS700ES GS1000E GS1000G GS1100G GS1100E
                  KZ550A KZ700A GPZ750
                  CB400T CB900F
                  XJ750R

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                  • jrobert94

                    #10
                    Oh good. I've got a friend with a 79 gs1000e with a yoshimura pipe with open header and i agree that is just too much. What do you think of Delkevic exhaust? http://www.delkevic.us/index.php?rou...roduct_id=3497
                    That's within my price range and looks a hell of a lot better than what i have now. It's for a 1000E but that will fit my 1980 1000G right? Just the rear bracket won't line up as i understand.

                    Comment

                    • Nessism
                      Forum LongTimer
                      GSResource Superstar
                      Past Site Supporter
                      Super Site Supporter
                      • Mar 2006
                      • 35790
                      • Torrance, CA

                      #11
                      If someone is running an open exhaust on their bike I put them on "ignore". Interestingly, I've got a fair number of guys on ignore but all but maybe one guy doesn't post here hardly at all so it's kind of wasted effort on my part. The culture around here is one of responsibility so the loud exhaust guys don't last long here it seems.

                      Delkevic seems like a good value. I was considering one for my KZ750 but after seeing some photos where the pipe for that application was hanging way under the sump I decided to pass. I hate that. A proper pipe will tuck up tight under the engine not hang down (my opinion). Of course this is just my pet peeve and may not be yours. Check them out close before purchase is all.
                      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

                      • Guest

                        #12
                        Jrober94, think you've just established yourself as a 'good egg' and a keeper on here.

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                        • loud et

                          #13
                          Good comments.
                          I had never even though of why there were half moons before. Lol. It makes perfect sense from the machining point of view.
                          I dislike the sound of a hacked off exhaust too. It just sounds like yit.
                          I do however love the sound of my vintage Kerker on my 1100E. It's loud but its a true exhaust sound. Not just disgusting, "look at how bad a$$" I am noise.

                          Comment

                          • Frank Z.
                            Forum Sage
                            Past Site Supporter
                            • Sep 2009
                            • 1458
                            • Austin, TX

                            #14
                            Originally posted by jrobert94
                            Oh good. I've got a friend with a 79 gs1000e with a yoshimura pipe with open header and i agree that is just too much. What do you think of Delkevic exhaust? http://www.delkevic.us/index.php?rou...roduct_id=3497
                            That's within my price range and looks a hell of a lot better than what i have now. It's for a 1000E but that will fit my 1980 1000G right? Just the rear bracket won't line up as i understand.
                            How about a stock exhaust system? The 1100cc type should fit your '80 just fine... but the pros here can confirm.



                            1982 GS1100 G OEM Exhaust - $150 (jblm)







                            condition: good
                            make / manufacturer: Suzuki



                            Selling the stock exhaust off of my 1982 Suzuki GS1100G. May fit GS1000 and other years or models of GS1100. Only 13k miles on system and no rust. Bike has been in heated storage for the past 15 years.
                            '80 GS1000ST
                            '92 ZX-11
                            Past rides: '79 GS1000SN, '84 GPZ900R

                            http://totalrider.com/

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                            • jrobert94

                              #15
                              Nessism - agreed but this guy has been good to me and he's my neighbor anyway so ignore is not really an option lol. And yeah i do want to see it on the bike from more angles before i buy. But the E exhaust WILL fit my G, correct?
                              Frank - thanks for the offer, i'll definitely consider it. I was leaning towards a 4 into 1 system though. Out of curiosity, does that cross pipe serve any real purpose? Mine doesn't have that.

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