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I cleaned my carbs and now have High Rev at Idel

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    #16
    Originally posted by tsabadlk View Post
    I am not sure that I set the pilot jet correctly(The pilot jet that is in the float bowl compartment) . I just bottomed them out and then put the plug back in...Is that correct? I have the Air Screw (the one on top of the carb) set 1.6 turns out. The idle screw is backed almost all the way out.
    ...
    One more question, is the air jet that is on the airbox side of each carb need to be bottomed out or does it need to be backed off as well?
    All the jets inside the float bowls should be snugged down. The pilot air jet in the carb intake throat should be snugged down. The ONLY part that is adjustable is the "idle mixture adjustment screw", which is the one you are simply calling "air screw". Most of us use a preliminary setting of 2.5 to 3 full turns out from lightly seated, then, when the engine is warmed up, slowly turn them in until the engine either hits highest idle speed or starts dropping speed. If it never increases, but starts dropping, just turn it out about 1/4 turn from where it starts to drop.

    Your high idle speed could be from a linkage that is stuck somewhere, or your idle screw might still not be out far enough.

    One more thing that can induce a high idle is greatly mis-matched carb sync. If one carb is open a LOT more than the others, it will prevent a low, proper idle speed. Have you checked your carb sync?

    NOTE: before doing a carb sync, you should really check your valve adjustment. If you sync your carbs first, then find that you have to adjust your valves, you will have to re-sync your carbs.

    .
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      #17
      Originally posted by tsabadlk View Post
      Thanks for the info guys! keep it coming. I have the carbs pulled now and have the float bowls off. I think I need to turn the pilot screws in the float bowl (the one that has the rubber plug on top of it) 2.5 turns out correct?

      Also does the Air Jet on the air box side of each carb need to be back out so far or set all the way in?
      No, the pilot screw is on top of the carb, at the front, covered by a cap

      The one in the bowl needs to be seated. The air jet needs to be seated

      The O ring on the pilot screw needs to be replaced

      The air box needs to be sealed

      Your high idle problem is common and results from air leaks. The intake manifolds themselves may have cracked due to age when you pulled the carbs.
      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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        #18
        I figured out the issue. This is my first bike and I normaly work on 4 wheeled vehicals. The problem was that I did not have the air filter and snorkel on! Man I wish I would have thought about that before pulling the carbs again. Thanks a lot guy for your help.

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