No banshee owner should be without a Clymer's Manual. That should be your first purchase, after the quad.
I was very tired when I wrote the original post, and it should read as below.
If excess gas is running out the overflow tubes, it's caused by either improperly adjusted floats, and/or bad needles and seats, which is causing your float bowls to overfill. This causes a rich condition, and fouls the plugs. Make sure the float heights are adjusted properly, and if it still does it, then it's time to clean, and/or replace the needles, and seats above the floats. If those needles, and seats get worn, they will allow the bowls to over fill, causing it to run like shit, and drip gas out of the overflow tubes. Get that stuff fixed first, and it might be alright, or it could have other problems.