Well, if the fuel/air mixture is routed from your carbs to your engine using rubber tubes then the first thing I'd try is making sure those clamps are on tight. If the rubber is hard you may have punctured one or more and need to replace them. Not costly and generally not hard to do.
It does sound like a carb problem but you could pop open the airbox to make sure its dry. Sometimes "crud" breaks loose and ends up messing with your idle passages in the carbs, leading to my next suggestion.
The next thing I'd probably do is to pull the carbs out and give them a nice, thorough cleaning. You'd need to pull the jets and other removable parts so they can be soaked in carb cleaner as well as using spray carb cleaner to clear out all the orifices. Then put it back together. If this is your first time, you'd be wise to invest in a service manual.
Then you could synchronize the carbs, which requires a special gauge and, again, the service manual. If you think you'll be dumping the bike in the next two years, this part might best be left to a local shop.
EDIT: I have no idea what I was smoking but the airbox to carbs has no real effect. I meant the suction into the engine from the carbs. Corrected!
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Last edited by kanwisch; 03-26-2008 at 09:16 AM.