HELP! Runs Great until warmed up

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  • odl777
    Forum Mentor
    • Jan 2006
    • 532
    • clayton
    #1

    HELP! Runs Great until warmed up

    Hello All!

    I have 1978 KZ650b with GPZ Cams, New Intake Boots, pingle fuel valve, New Gas Cap, rebuilt head/Bore, Dyna S, 4 into1, K&N Pods, Sparx Battery Eliminator (Reg/Capicitor).

    Issue:
    Bike starts easy (Kick only)....has strong power but I suspect still some jetting issues with the needle. Any who I ride the bike for about 10-15 minute...ton of power idles good no issues. The bike warms up and then it wont idle unless I stay on throttle. Bike will start up immediate no issues.... but in order to start I have to use throttle.

    Could this be my float adjustment? Or possible carb sync issue? I benched sync the carbs to get close and then used a vacuum gauge from a VW (Snail style) to tune.....it was pulling roughly 3psi or 3kg/h .

    Guage:
    CB Performance Products | Aircooled VW Parts, Cylinder Heads, Ignition & EFI Systems
    http://www.cbperformance.com/ProductDetails.asp?ProductCode=6537



    Thank you!

    Mark
    Tags: None
    • Steve
      GS Whisperer
      • Jun 2005
      • 35924
      • southwest oHIo
      #2
      Methinks you might have clicked on the wrong bookmark.

      This is the Suzuki GS site, not the Kawasaki KZ Riders site.

      .
      sigpic
      mine: 2000 Honda GoldWing GL1500SE and 1980 GS850G'K' "Junior"
      hers: 1982 GS850GL - "Angel" and 1969 Suzuki T250 Scrambler
      #1 son: 1986 Yamaha Venture Royale 1300 and 1982 GS650GL "Rat Bagger"
      #2 son: 1980 GS1000G
      Family Portrait
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      Want a copy of my valve adjust spreadsheet for your 2-valve per cylinder engine? Send me an e-mail request (not a PM)
      (Click on my username in the upper-left corner for e-mail info.)

        Comment

        • gs550rebuildguy
          #3
          Set the idle after warm right?

          Your choke circuit is in play when cold.
          Try setting your idle speed adjustment screw faster once its hot.

            Comment

            • odl777
              Forum Mentor
              • Jan 2006
              • 532
              • clayton
              #4
              I thought a 4cyclinder was a 4cyclinder? I own 2 GS's so Im not too fond of the KZ Forums.



              Thank you Rebuild guy....I have tried that but the bike idels to high...it works just not the fix.

              I may try to adjust my sync settings where the slide is higher.

              Thank you!

                Comment

                • Nessism
                  Forum LongTimer
                  GSResource Superstar
                  Past Site Supporter
                  Super Site Supporter
                  • Mar 2006
                  • 35788
                  • Torrance, CA
                  #5
                  Vacuum sync then go from there. It's almost impossible to diagnose running problems on a bike that hasn't been properly maintained.
                  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

                    • odl777
                      Forum Mentor
                      • Jan 2006
                      • 532
                      • clayton
                      #6
                      Thank you! The carbs are sync'd and the problem continues!!! I also have a ton of white smoke coming from the engine vent near the back of the motor.

                      Thank you!

                        Comment

                        • Maddevill
                          #7
                          If it runs good cold and bad when warm I would suspect your mixture is rich. Do you have to use no choke or very little choke to start it? If so, your mix is acting as your starting level, which is too rich when the motor is warm.

                            Comment

                            • Guest
                              #8
                              White smoke? White smoke would indicate water(?) in the system, black is too rich and blue is oil.

                                Comment

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