I was riding on a track yesterday and bottomed out hitting a jump then shortly after that i heard my valves chattering and the bike just shut off. When i got f the track i noticed that oil was pouring out of the bottom of the bike so i looked a little closer to see that i cracked the case where the drain bolt screws in. I am sure i am going to need a new piston and rings valves and of course the case. How much do you think it would cost with labor parts and all the other BS. Also what do you think could of caused this ?