Originally posted by EVOLUTION
What do you think caused this,is it too much play in the bushing/crankshaft or maybe the engine revved to long without any additional load(runaway)? 
When a conrod blows like this is for too much slope in the bushing of the conrod with the crank pin (take attention on this if you appreciate your engines). I safer to spend 20$ on a new conrod from time to time than burn a lot of bucks in a new engine due a blown conrod.
Saw some of those and almost were by a worn conrod.