Idle issue with Video!

[bakirkwold]

I have a 81 GS450 L. CV carbs. It will get "Stuck" around 3 K then after 10 seconds it dips to 2 K but will not return back to 1,100 unless I blip the throttle a little bit. I have messed with the idle screws no difference. And I did check for air leaks. But I am pretty sure there is none because it idles at 1,100 just fine. I did also swap the CV slides. Here is a link to the vid I took tonight. http://www.youtube.com/watch?v=s37UB9_RWoY Thanks!

[Nessism]

Where are the mixture screws set? Did you sync the carbs yet? These items were mentioned in your last thread but I didn't see your response. It's best to stay with one thread instead of starting several on the same topic, that way we know what's been done already.

[bakirkwold]

Alright, sorry about that. But yes they are synched. The screws are at 1 1/4 right now I did turn them out 1 turn and it makes no difference.

[Nessism]

Try 2.5 turns like I suggested in your other thread.

[bakirkwold]

I just tried it. Same thing is happening.

[Nessism]

Could be air leak then. Did you replace the intake boot O-rings? Spraying stuff around the boots is an unreliable to check for leaks in case you've tried that. Also, make sure to ride the bike and then judge the carbs tuning. Blipping the throttle on a cold engine is not the best way.

[bakirkwold]

Nope I haven't. How could it be an air leak if it idles fine some of the time?

[JEEPRUSTY]

could it not be mechanical binding in the throttle spring?

Those over redline blips are fun.

[bakirkwold]

It sure could. How would you test that? The throttle snaps back pretty quick.

[JEEPRUSTY]

You should be able to see it.
Look for a break in the spring. That would cause it to load up and maybe bind then release.

[bakirkwold]

I will check. Could I move the throttle a few times and try to push the part the cable connects to down?

[JEEPRUSTY]

I am assuming your spring is a winding around the throttle shaft.
I was alos thinking of an old snowmobile carb and my bike.
I do not really know what the springs on yors would look like.

[Nessism]

Nope I haven't. How could it be an air leak if it idles fine some of the time?

Not sure, but it seems like a lean mixture issue. The O-rings should be replaced regardless, unless you know for a fact that they have been replaced recently.

[bakirkwold]

Yup they do need to be changed. Where is a good place to get them?

[GateKeeper]

O-rings, get them here

http://www.cycleorings.com/

http://www.cycleorings.com/intake.html

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