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GS1000 8 valve with 3000 rpm problem

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    #31
    Originally posted by Rijko View Post
    Hi Peter, it's been a while !

    Those igniters are sturdy but can fail, causing strange issues.

    Have you checked the connectors are clean and it gets good 12v and ground ?
    Hi Rijk, how are you doing? GT750 already ready?
    The plugs of the connecters are 6.5mm sliding plugs, there is little to clean, and usually that makes good contact. What I do wonder is whether a GS1100 ignition box works on a 1000. I am also busy cleaning a 3rd set of carburettors, with all new O-rings and very good checking that all channels are good. Ie Jets and Idle port, (opening near the block after the throttle) and the Transfer Port (opening under the throttle)

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      #32
      GT750.jpg

      GT is ongoing. Mostly done, need original front discs (non perforated).
      I am working on the rear shocks and have an original seat looking
      like new. Some other details.

      Sounds like a good plan to try another ignition on the GS1000.
      Just to confirm your setup works and is not broken.
      Maybe Jordy has one or can borrow one from Frank ?
      Rijk

      Top 10 Newbie Mistakes thread

      CV Carb rebuild tutorial
      VM Carb rebuild tutorial
      Bikecliff's website
      The Stator Papers

      "The thing about freedom - it's never free"

      Comment


        #33
        GS1000.jpg

        Started working on this GS1000 again after a loooong time
        Rijk

        Top 10 Newbie Mistakes thread

        CV Carb rebuild tutorial
        VM Carb rebuild tutorial
        Bikecliff's website
        The Stator Papers

        "The thing about freedom - it's never free"

        Comment


          #34
          GT is ongoing. Mostly done, need original front discs (non perforated).
          I am working on the rear shocks and have an original seat looking
          like new. Some other details.
          Very nice, we should meet again @Franks Place



          Sounds like a good plan to try another ignition on the GS1000.
          Just to confirm your setup works and is not broken.
          Maybe Jordy has one or can borrow one from Frank ?
          We have tested the bike with another CDI and pick-ups, same results!
          When we set the idle speed to normal values 1200RPM (coming from below 800RPM) and we give some throttle, the machine does not fall normally from 3000 RPM

          We now suspect either a bent valve or a leak in the manifold. Although a curved valve is a question mark with leak values of: 5% -3% -3% -2%.
          But 1 or 2 sputters back into the inlet, so there is still something going on in the head

          Comment


            #35
            Originally posted by Rijko View Post
            [ATTACH=CONFIG]61470[/ATTACH]

            Started working on this GS1000 again after a loooong time
            Do you want it to come original?

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              #36
              no, this is not an S but a regular GS1000.
              Like the look as it is.

              New Tarozzi rearset on old Raask hangers.
              Rebuilt Marzochhi rear shocks.
              New stainless steel Delkevic exhaust.
              New Dyna S and 3 Ohm coils.
              New tires on freshly powdercoated 18 inch Slabby wheels with new bearings,
              Sonic front fork springs.
              Will probably upgrade the front brakes to Lockheeds.

              Seat pan made to fit the frame, next up will be seat upholstering.
              I will build all new electrics, from Caltric stator to SH775 RR and will
              probably use the M-Unit i have for that, too.

              The black tank is just used for fitting the seat pan, i have a red one.
              Here's a pic from earlier

              red.jpg
              Rijk

              Top 10 Newbie Mistakes thread

              CV Carb rebuild tutorial
              VM Carb rebuild tutorial
              Bikecliff's website
              The Stator Papers

              "The thing about freedom - it's never free"

              Comment


                #37
                Slow return from higher rpm and spitting back usually means really lean, so a manifold leak may very well be the issue.
                Rijk

                Top 10 Newbie Mistakes thread

                CV Carb rebuild tutorial
                VM Carb rebuild tutorial
                Bikecliff's website
                The Stator Papers

                "The thing about freedom - it's never free"

                Comment


                  #38
                  OK, I'm going to ask the stupid question so don't smack me... most people use clear tubing for the gas line and vacuum line. In the photo you have a clear line going to carb #2 and black line connected to carb #3. Are you using the line from # 2 carb for vacuum? It should be on carb #3.
                  -Mal

                  "The only reason for time is so that everything doesn't happen at once." - B. Banzai
                  ___________

                  78 GS750E

                  Comment


                    #39
                    John, he's already said he capped the vacuum port on #3. Clear lines to vents as needed
                    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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                      #40
                      Thanks Big T, I just thought it looked weird even though he's deep into a more serious issue...
                      -Mal

                      "The only reason for time is so that everything doesn't happen at once." - B. Banzai
                      ___________

                      78 GS750E

                      Comment

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