Paul, con rods get tired and there is no history on how these motors have been treated in the past. Some years ago I was putting an Enfield motor together for a friend and I said to him, "this con rod has done 120,000ks I think we should replace it as this is its 5th rebuild" His reply was "because it has done 120,000ks I think this rod is a good one" 5,000ks later the motor threw the rod out through the side of the case
