Stewaustralia,
I wonder if some of the motors coming directly out of Hong-Kong are the ones that didn't pass quality control? It seems that most of the problems come from the engines that are not pruchased through one of the distributors.
Just my thoughts from your comment on the bearing fit.

My DL50 is currently waiting on the plane to be finished. I will post my expierences with it once it's installed and running.