You need to check the float level. Here is how you do that.
Hold the carb with the throttle bore vertical and the float hinge at the top so that the floats can swing freely. Swing the floats with your finger to verify they are free and operating properly. Now, just rotate the carb towards the upside-down position only until the floats just sit down on the float needle valve. Any more rotation will cause the weight of the floats to push down on the spring loaded float needle valve and you will get an erroneous reading. The proper angle is about a 45 degree angle from vertical.
At this point with either a metric measuring scale or the tail end of a pair of calipers (or other such accurate measuring device) measure the distance from the float bowl gasket surface -- WITHOUT THE GASKET-- to the top of the float itself. This measurement should be 21mm exactly on both floats. If you get some other reading just bend or tweak the float arms until you get this setting. Just don't bend them sideways so that they may interfere with the float bowl itself. Check for clearance when you are finished. When you are satisfied they are perfect, replace the float bowl gasket and float bowl.
2001 Banshee with FMF SST,
K&N air filter with a Pro
Flow Adapter plater, Renthal
Bars, +4 Degree Key, Cool Head