OK after working on this bike for months I finally started it back up today using an auxiliary fuel tank. It warmed up a lot faster with the new 40 pilot jets.    

So after it was warmed up, I was setting the idle and testing the return to idle after giving it some gas. It seemed to take about 3-4 seconds to return to idle, which I thought was too slow. The throttle cable is travelling freely.

Its getting late and so I'm done for the night. It was too late to start my EX500 as a comparison but I will pay attention to that bike tomorrow.

Any ideas where I should focus my attention? Is this slow return to idle a symptom of the float level being too high?  :dunno:

Current set-up:
- 40 pilot jets
- 125 main jets
- Air screw 3 turns out (I think)
- Cobra slip on exhaust
- UNI foam filter in stock airbox

FWIW, the bike had been pretty much stripped down to the frame, engine and main wiring harness and put back together so everything is suspect.

Check the throttle tensin at the little adjuster nut by the throttle itself.  After I rejetted a couple weeks ago and put everything back together, mine was sticking and slow to come down to idle. I loosened the little nut up by the throttle and gave it a little slack and that did the trick for me.

Jake

Isn't that slow-return-to-idle caused by lean condition also?

"If the throttle is lightly "blipped" at idle, and the rpm "hangs up" before dropping to the set idle speed, and there are no intake leaks and the idle speed is set at less than 1000 rpm, the mixture screws are probably too lean: try 1/2 turn out, to richen mixture. Be sure there are no intake leaks and the idle speed is set at less than 1000 rpm!"

http://win2k.vnethorizon.com/factorypro/tech/carbtune,CV,high_rpm_engines.html

It sounds like the carbs need to be syncronized/balanced.

3-4 second return is not too bad... if the hanging is quite easily perceivable... that is lean or sucking air... more like sucking air or very very slightly lean or yes carb synch too. Very Lean the rpm will stay high... not fall back to idle at all...
Cool.
Srinath.

Thanks everybody. That gives me some things to look at tonight. I was planning to do a carb sync when I got distracted by the idling.

Also, try screwing in the airscrew, half a turn at the most, after you balance the carbs. If the balance doesn't fix it.