I just went through this over the last few days. I have a stock 2000 banshee, with TORS, Stock carbs and emgine, FMF gnarlys with Turbine core II spark arrestors, and a twin air filter. I put 260 mains in it and left everything else alone. With the lid and snorkel on, it was too rich. I pulled the lid and it runs like it should. I would say that I'm close but not perfect since I needed to pull the lid and snorkel. I'm at 2140 feet in western PA. it was about 75-78 degrees yesterday when I ran it.
I am by no means an expert on this and you might seriously want to consider what the other guys on here say. I'm just sharing my experience with a similar situation. Hope you get it tuned soon. Mine really came alive after jetting it "properly" (still need to tweak it a bit)