Pull your carb off the intake and check the slide when you open the throttle. The flat slide should come almost all the way up exposing about all of the circular part of the carb. But still I recommend doing a plug chop to know for sure if you need a bigger or smaller jet. You can buy jets here.
http://www.sickbikeparts.com/catalog/product_info.php?products_id=116
http://www.sickbikeparts.com/catalog/product_info.php?products_id=116