I have a 04 model 400 AT. The wife and i were riding it Sat. and all of a sudden i had to give it more and more gas to make it go. Finally i was in the conner and the bike would not move it will just sit there and bogg down. I lifted the bike up and the front and rear wheels both turn smoothly. Is there and sort of engine break that could be getting stuck? Does anyone have any ideas?