First of all, if you plan on balancing your carbs and your bike uses Yamaha's YICS and you don't have the $95 shutoff tool, then Click Here to get detailed instructions on how to make one.
Another tip for your carburetors is to use fuel injector/carburetor cleaner that you simply put in the gas and it is supposed to clean them out. I've heard that this works but I don't guarantee it!