GS-850 High idle

[Furious D]

Yet another idle thread,

This morning I decided to take the vacumn off the petcock. I suspect I am having petcock promblems, It seems to want to die when idleing for extended periods.

I have ran it for a couple days on prime and that seems too have fixed that problem. After looking at the vacumn line it is pretty cracked so I block it off at the #2 carb and at the petcock. But when I fired it back up it just stays at 3000 RPM.

Thinking the previous owner had bumped up the idle speed to mask another problem I tried to adjust it down but backing the adjuster out 3 turns has no effect.

Any Ideas? I plan to replace the vacumn hose and purchase another petcock, but I really dont want to tear the bike down till the snow flies. Then I will pull the carbs off and give them a good inspection.


I did try other vacumn caps as well. The intakes were replaced 500 miles ago as well and I checked the clamps that hold the carbs.

[Steve]

It's an age-old question, but it has to be asked ...

have you cleaned the carbs and replaced the o-rings?

.

[Furious D]

It's an age-old question, but it has to be asked ...

have you cleaned the carbs and replaced the o-rings?

.

Not yet...

I am a little baffled by the fact that all I did was plug off the vacumn line and this problem showed up.

I would have thought it would have done the opposite looking at the condition of the vacumn line. I just got back from a 5 mile test ride. Other than the 3K idle it runs good. Sounds smooth, No popping and it does idle down when I let off the throttle but stays at about 2800 RPM . I also checked to make sure the throttle cable had some slack , which it does.

Edit: I stole the hose off my Vacumn gage, No change. I did take a vacumn reading, about 12 Lbs. with a little flutter which I expected.

[rideOn]

i plugged the vacuum system after it stated sucking gas into the engine. i went permanent manual. BUT, i also had flaky idle problems til i rebuilt the carbs, replaced carb o-rings and boot o-rings. it took a little teaking for a good fuel mix...sometimes i'm a little slow on mechanics , but now? work good, last long time. idle stays consistent

[tom203]

Yet another idle thread,

This morning I decided to take the vacumn off the petcock. I suspect I am having petcock promblems, It seems to want to die when idleing for extended periods.

I have ran it for a couple days on prime and that seems too have fixed that problem. After looking at the vacumn line it is pretty cracked so I block it off at the #2 carb and at the petcock. But when I fired it back up it just stays at 3000 RPM.

Thinking the previous owner had bumped up the idle speed to mask another problem I tried to adjust it down but backing the adjuster out 3 turns has no effect.

No effect? at some point the throttle plates will close down enough for the engine to stall. Something must be hanging them up, OR you have a intake air leak, despite any claims that all is tight from carbs to engine. Those carb clamps can fool you, especially on old hard boots.

[Furious D]

No effect? at some point the throttle plates will close down enough for the engine to stall. Something must be hanging them up, OR you have a intake air leak, despite any claims that all is tight from carbs to engine. Those carb clamps can fool you, especially on old hard boots.

I wonder if there is a problem with the idle speed adjuster. Its really hard to turn. I cant see it but I will try to use an inspection mirror to look at it.

Rubber boots are pretty new and I checked the clamps.