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gs750 1977 whirring noise

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    #1

    gs750 1977 whirring noise

    whirring from left side, had starter motor and stator checked ok. Is this the cam shaft wearing out or a too tight cam chain as it has a auto cam chain tensioner? The whirr follows revs at idle so its not gears

    it was dark

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    #2
    On the left side of the tesioner theres a jam nut and screw arrangement...loosen the jam nut and bottom out the screw. Then turn the screw backm out about 1/3 turn and tighten the jam nut. Thism will at least insure the guide rod isnt impinged. Start the bike and see what happens. The only other thing thats spinning if the bikes not being driven is the rotor. Take a metal rod and put it on the cover and then listen at the other end of the rod..thats a poor mans engine stethescope.
    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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      #3
      Originally posted by ybot1966 View Post
      whirring from left side, had starter motor and stator checked ok. Is this the cam shaft wearing out or a too tight cam chain as it has a auto cam chain tensioner? The whirr follows revs at idle so its not gears

      it was dark

      http://www.youtube.com/watch?v=2dS2y-CVGMA
      Maybe the rotor makes the whirring noise if the oil quantity is too low.


      Life is too short to ride an L.

      Comment

        #4
        Or if the stator and rotor are slightly rubbing together.
        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.

        Comment

          #5
          What about worn cam chain guides in the engine???
          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.

          Comment

            #6
            I don't think you could hear those until the chain got too lose, then it would rattle from the top end.


            A GS that isn't making noise isn't running.


            Life is too short to ride an L.

            Comment

              #7
              is it possible to run an engine with the stator cover off cos although it was checked it sounds nearer to that area?

              Comment

                #8
                Make sure the keeper plate that holds the stator wire back inside the cover is as tight and flush to the cover as you can get it. I had this happen once on a Gs1000. The rotor was rubbing that keeper plate and made the same noise. No damage done, but check it.

                Also keep in mind, if you didn't know, that the 8v 750 had straight cut gears so they sound a little "whiney" compared to others..

                Comment

                  #9
                  The stator is oil colled and theres a big hole just around the connector gear between the starter and the starter clutch. in "THEORY" if a way was found to plug the oil journal from pumpingb oil oput on the floor, then yes you could start the bike with the kick starter...The stator cover acts as one half of the piloting holes for the connector gear axle, so youd have to start it with the kicker with the stator cover off.
                  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.

                  Comment

                    #10
                    thanks for clues
                    hes a daylight clip

                    - YouTube
                    http://www.youtube.com/watch?v=lzBvjuLica0
                    Enjoy the videos and music you love, upload original content, and share it all with friends, family, and the world on YouTube.


                    It started as a whistle but progressed to a this it doesnt effect the running or produce any smoke or change in tone

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