I have a 2010 yz450f and I was riding a wheelie and it fell over on the left hand side. It was in second gear and when I lifted it back up it stalled out. I then went to start it and the kick starter was as hard as a rock. I can put it in neutral and push it so I don't believe it's the transmission. I also took the spark plug out and it's still hard as a rock. Does anybody have any suggestions on what it could be?