Idle issues. HELP!

[TrevorG]

Hey everyone.

I just bought a 99 gz. I'm loving it so far, or rather, would be if it was idling properly. I'm hoping somebody has run into this problem before and knows what's up.

The bike starts fine, but requires constant revving to stay running. If I close the throttle the idle will slow down slowly till the bike dies. I've adjusted the idle speed, but when I get it to a place where the bike idles "properly" it will stay at a very high idle after revving and sloooooowly work itself down until again, it dies.

EDIT. Also, the bike will only run with full choke. I was stupid and assumed that when the lever was pulled all the way towards me choke was off. It's actually opposite, choke pulled forwards is choke on, choke pushed all the way back is no choke. This leads me to believe, as Raul said, there may be a vacuum leak as when I turn the choke off, the bike dies. My first step will be to make sure everything is sealed, then to play around with the fuel/air mixture screw, and lastly pull the carb and give it all a good cleaning and reset.

Anybody have any other advice for me? Think it could be something other than carburetion?