I'm some what new to the 4 stroke seen always ran 2 strokes. But anyways just got a 08 kx450f not to long ago and I was riding lost compression so tore it apart and here the piston was cracked everything else looks ok. Would anyone happen to know why the piston would crack. Never had this happen. Didnt know if it couldve been just worn out or not. Thanx I'm new to forums.