Engine won't idle....1978 Gs750E

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  • Veez_strom
    #1

    Engine won't idle....1978 Gs750E

    After much wrenching, swearing, and crossing my fingers I got my engine started this weekend. First time since 2000 as far as I can tell.

    The motor and carbs are from a 1977 that was last registered 1996 and last started in 2000. I bought the parts bike disassembled in 2007.

    After powder coating, reassembling and hunting down bad ground wires I finally got the bike to kick over, but its running at very high RPM. My guestimate is around 2500 - 3k.

    The throttle cables are set to the lowest setting and the RPM adjustment screw is set to its lowest, but the throttle "rocker" mechanism won't bottom out on the RPM screw. <--- this is the case even with the cables removed. I have set each carb to 1-1/4 turns from fully seated.

    I have an extra carb set and searched it over looking for a secondary adjustment but found none. The bike is completely off choke when the idle is high and idles even higher with the choke on.

    Any hints, hunches, or straight-out advice is appreciated.

    On a second note: I have a Dyna 3 ignition from my original (now frozen) motor. Would I be best served to seek out installing that unit or should I stick to the original points system?

    Thanks in advance.

    T-
    Last edited by Guest; 04-27-2009, 08:40 PM. Reason: typo
    Tags: None
    • ryonker
      #2
      Have the carbs been cleaned? Like, totally disasembled and soaked, air blasted out and new o-rings installed?

      Perhaps the slide is stuck?

      Rick

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        • Veez_strom
          #3
          The carbs weren't opened. The parts bike was fairly well cleaned, catalogged, and shrink wrapped when I bought it. The barrels and needles inside the carb seemed to move freely when off the bike, so I impulsively installed it without breaking them down.

          If Its not something simple that I'm over looking, then I'll most likely break them down completely. Just a job a was hoping to avoid at this time.

          Thx

            Comment

            • ptm
              #4
              Make sure the hose from carb #3 is attached to the petcock or is plugged. If it isn't it adds a lot of air to the system and it will idle fast.

                Comment

                • Guest
                  #5
                  Clean the carbs and replace the o-ring behind the intake boots.

                    Comment

                    • Big T
                      Forum LongTimer
                      Past Site Supporter
                      Super Site Supporter
                      • Mar 2005
                      • 12392
                      • West Slope, OR
                      #6
                      From what you describe, either you have vacuum leaks on the intake , or the carb set was synced too high.
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                      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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                        • Veez_strom
                          #7
                          Consensus sound like I should look for vacuum leaks. Will do.

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