You've got the clip idea right, the higher the setting the leaner the mix - but nothing will increase/decrease the airflow save the restriction of the airfilter.

As for your revs taking a long time to return to idle, could it be simply a binding throttle cable? The rest sounds like just a matter of dialing in the mix, something you seem quite capable of... but that slow return is an odd one...


With the engine off, if your throttle cable is set up properly (slack taken out w/adjusters) you should be able to hear a "tink" as the slide hits the top at full throttle and another "tink" as it hits bottom when you release the throttle. It's faint and a little hard to hear - but if you don't hear that sound of the slide bottoming out as soon as you let go the grip, there could be drag in the cable housing... lube (inside the grip too) and make sure there's no sharp bends. There's always the big slide return spring inside the carb, there's also the possibility the little throttle cable nubbin isn't seated properly in there and is dragging a lil, but it's unlikely that these are the probs.

I hope it's as easy as that