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1977 GS750 Valve Issue ?

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    #31
    It did seem like a big jump to me as well and I'm definitely riding it cautiously for the time being. I'm planning to check the clearances again after a few hundred KMS. I haven't touched the shims or valves in the last year and a bit (since I've owned the bike) and have no idea when they we're done before that. Can pure neglect cause this size of change or should I be leaning towards taking it apart further to check for burnt valves / damage to the seating areas?

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      #32
      Neglect will for sure cause extremely small ( tight ) clearances..but to have to drop that much on them is kinda hard to explain. Run it and see what the next readings bring is about all you can do for now.
      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

        #33
        Originally posted by XGS750X View Post
        It did seem like a big jump to me as well and I'm definitely riding it cautiously for the time being. I'm planning to check the clearances again after a few hundred KMS. I haven't touched the shims or valves in the last year and a bit (since I've owned the bike) and have no idea when they we're done before that. Can pure neglect cause this size of change or should I be leaning towards taking it apart further to check for burnt valves / damage to the seating areas?
        I'd go about 2,000k and check them again

        That should give you a good idea of the wear rate. I wouldn't be worried about tearing into the motor just yet. A compression test comes first
        1978 GS 1000 (since new)
        1979 GS 1000 (The Fridge, superbike replica project)
        1978 GS 1000 (parts)
        1981 GS 850 (anyone want a project?)
        1981 GPZ 550 (backroad screamer)
        1970 450 Mk IIID (THUMP!)
        2007 DRz 400S
        1999 ATK 490ES
        1994 DR 350SES

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          #34
          Ran it about 200km and starting to get some exhaust popping at lower RPMs, so I took it apart and remeasured the clearances. It seems that the clearances are already getting bigger. Any idea what this means?

          Cyl #1 EX
          Previous clearance: .07mm
          New clearance: .09mm

          Cyl #1 IN:
          Previous clearance: .07mm
          New clearance: .07mm

          Cyl #2 EX:
          Previous clearance: .09mm
          New clearance: .10mm

          Cyl #2 IN:
          Previous clearance: .08mm
          New clearance: .10mm

          Cyl #3 EX:
          Previous clearance: .07mm
          New clearance: .08mm

          Cyl #3 IN:
          Previous clearance: .09mm
          New clearance: .08mm

          Cyl #4 EX:
          Previous clearance: .05mm
          New clearance: .08mm

          Cyl #4 IN:
          Previous clearance: .08mm
          New clearance: .10mm

          Comment

            #35
            There was carbon on the valve faces. It's wearing off so your clearance is increasing.

            I wouldn't worry about the valves at .10mm.

            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

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