I have a 2015 sportsman that was running fine for awhile and the when i shut it off and re-started it i had a problem. the engine was vibrating vigerously and was shaking the whole atv. after about two munutes of this i heard a loud clanking noise and the bike shut off. now, it wont even crank over and we took it to the dealer and they gave us most of the money back but now we are left with a blown quad. does anybody have any idea of what could of happened?