make sure your gas cap vent is not stoped up and the vent hose's on carb's this happend to my one time.hope this help's :thumbsup:
you may have what he mentions later in the post about the carbs being sucked dry. you may beed to visit his sticky and trim the float stopper.All raptor leak gas out of the carbs when you wheelie. You might never be able to fix that, but the float mod mentioned in my post might help to make the carbs leak less. I still find that some guys say they cannot wheelie even after the mods, but try the mods, but don't cut the float stopper unless you find you have problems of the carbs being sucked dry when you ride at full throttle for long distances.