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1981 GS550L High Idle and Hanging Idle

  • Thread starter Thread starter kylekochan
  • Start date Start date
K

kylekochan

Guest
What I've done to the bike:

- Cleaned the carburetors
- New intake boots
- New airbox boots
- New O-ring for intake
- Weather stripped airbox
- New and oiled air filter

I set my pilot air screws at 2.5 turns and can start the bike and set idle to 1150~ but when I twist the throttle it will hang. So I have tested turning the pilot air screws out .5 up until 4 turns out, and the bike will idle too high, still have hang, and the idle adjustment knob is completely turned out, closing the butterfly valve.

I'm completely lost. Any advice would be great.
 
Do you have smooth throttle cable operation/lubrication? Does the throttle tube snap back when you let go? Does the routing of the choke cable foul the throttle linkage on the carbs, causing the throttle to hang or return slowly?
 
Yes, they've been lubricated and the throttle snaps back quickly when I let go. The cable returns correctly and has the correct slack as well...
 
Wouldn't I need to adjust the pilot air screws until highest idle and then decrease to 1200~ rpm for vacuum synch? I'm getting 4000 rpm when I have highest idle with pilot air screws adjusted and the idle knob is completely unscrewed with the butterflies completely shut.
 
kylekochan said:
Wouldn't I need to adjust the pilot air screws until highest idle and then decrease to 1200~ rpm for vacuum synch? I'm getting 4000 rpm when I have highest idle with pilot air screws adjusted and the idle knob is completely unscrewed with the butterflies completely shut.
Click to expand...

Sounds like a vacuum leak somewhere, and a pretty good one at that. With such a large leak it may show up if you spray some WD-40 on the carb intakes and around the throttle shafts. Worth a try anyway.
 
I am having what sounds like an identical issue on a 78 GS 1000. I have done all you have as well, very strange as it seems to run well otherwise.
 
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