On a dirtbike, can having the wrong valve clearances cause the cam chain to snap?

On my 2007 KTM 525xc the cam chain snapped and broke the head. I am just wondering what may have caused this to happen, as my bike is not very old and seemed to be in good shape. I recently adjusted the intake valves to the .005 clearance and adjusted the throttle clip on the pin in the carb to get the bike running a bit better (and it worked) But then as soon as I got it going strong the cam chain snapped and broke a hole in the side of the case. The oil was fresh in the bike and it had the right level, coolant level was good, freshly rebuilt carb and vlave adjustment, and everything else was seemingly good. Could it have happened because I spaced my valves wrong? or was it probably because the previous owner just rode it too hard and it eventually gave out? Please answer if you are experienced I know a good amount about general care for bikes but this one really stumped me.