Throttle/RPM Question

[kahhns]

I've recently purchased a 1999 GS500E.  The bike had just under 6k mileage.  The bike when it revs up seems to slowly rev down.  This is the most notable if you're sticking 5-8k RPMs for a period of time (2-3 minutes).  After getting and maintain this RPM for a period of time, when i pull in the clutch & release the throttle, it takes about 15 seconds to get back to 1200 RPMs from being at 6k. 

Ideas on what I should be looking at?  (should I be thinking a carb issue?  A spring need to be replace? etc)

Any ideas would  be appreciated.

[fred]

Welcome. That kind sounds like idle hovering... I don't really know much about it, but a quick search for "idle hovering" should tell you what you need to know...

[beRto]

I've recently purchased a 1999 GS500E.  The bike had just under 6k mileage.  The bike when it revs up seems to slowly rev down.  This is the most notable if you're sticking 5-8k RPMs for a period of time (2-3 minutes).  After getting and maintain this RPM for a period of time, when i pull in the clutch & release the throttle, it takes about 15 seconds to get back to 1200 RPMs from being at 6k. 

Ideas on what I should be looking at?  (should I be thinking a carb issue?  A spring need to be replace? etc)

Any ideas would  be appreciated.

Welcome!  

The problem you have described is very common to the GS - it is called "hanging idle" or "idle hovering".

Have a look at this FAQ thread for some ideas:
http://gstwins.com/gsboard/index.php?topic=41199.0

Searching for "hanging idle" or "idle hovering" will also turn up many related threads.

Good luck! Let us know how it turns out.

[kahhns]

Awesome.  Thanks for the amazingly quick responses!!!!

[nascarkeith]

I  just shimmed my carb needles and had a slight idle hover.  A small twist of the idle screw solved it.  The added shims had me idling too high.