Where abouts are you, you might have a shop close by! Or I might be able to look at it myself! There's Yamaha Dealers everywhere out here. Walk in and grab the jets for a few bux! Banshee's love to breath, rip that airbox lid off & throw a K&N Filter in there! You'll need more fuel along with that. The 300's sound close & could be a starting point, definately raise the needle clip [try 3rd clip] & try the a/f screw at 2 turns out. If the pipes ping you're lean & require bigger jets, i dought it it though!
So Cal Represent!! :biggrin: