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    GS Cam Half Moons

    Quick question why did Suzuki cast the cylinder head with the rubber half moons, what is the purpose of the little buggers cause all mine seem to do is weep oil!!

    #2
    Those cut-outs are so that they could align-bore the cam bearing surfaces.

    Daniel

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      #3
      The head and cam caps were milled from the side as a single piece. The half-circle is where they milled it. Use threebond to stick the half-moons onto the head, and put them in backwards (i.e., with the lip on the inside). This keeps them from popping out and may also help with cam side float.

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        #4
        Wow that was quick. Cheers guys I've put the engine back together now and apart from one weep from the front half moon things seem ok, will turn them around at next clearance check.Did notice that the moon that leaks was an old one I'd put back in by mistake. Oh well you live and learn.

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          #5
          The half moons should be glued into the engine on the curved section. This is well covered in the archives. Threebond 1194 is the product of choice for applications like this. Do this and you won't have any more leaks.
          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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            #6
            I also add a dab of three bond on the tops where the gasket contacts them.. just for the little extra piece of mind.
            MY BIKES..1977 GS 750 B, 1978 GS 1000 C (X2)
            1978 GS 1000 E, 1979 GS 1000 S, 1973 Yamaha TX 750, 1977 Kawasaki KZ 650B1, 1975 Honda GL1000 Goldwing, 1983 CB 650SC Nighthawk, 1972 Honda CB 350K4, 74 Honda CB550

            NEVER SNEAK UP ON A SLEEPING DOG..NOT EVEN YOUR OWN.


            I would rather trust my bike to a "QUACK" that KNOWS how to fix it rather than a book worm that THINKS HE KNOWS how to fix it.

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              #7
              Just use some RTV on the outside of the Half Moons.....problem solved.

              I installed new moons, and still RTV'ed mine....just incase.

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