I've been thinking about the people that have reported their timing chain jumping time and was trying to come up with some type of correlation between these events. I'm having a hard time wrapping my head around it just being a random occurence based on a 'perfect storm' condition manifesting itself. We know it happens..recently I've seen/heard of it happening at 55 hrs and 30 hours. No reports of faulty tensioners. It has never happened to my bikes but I change mine at 50 hours and there is an easily observable difference in chain length between the new/old cam chain, but I have never seen any kinking or even binding. On the failures, what, if any, other observations were made? That is, scoring on the cam journals? Were the valve clearances in spec? Oil change frequency? Condition of the cam chain 'sliders'? Any other thoughts?