my engine broke

[qaart]

i was runing my brand new ofna lx 1 i ran 5 tanks to break it in after i replaced the rear diff on the 7th tank my engine kinda poped and locked up so i took the engine out and found the piston and pushrod broke
http://s538.photobucket.com/albums/ff343/qaart/ its the first pict

 

[Scrogg]

That usually happens when you run the engine too rich during breakin. All that excess fuel does not compress and stresses the conrod. When you break an engine in, keep it around 200-230F. You want it to run smoothly, but slightly rich. Blubbering rich and bogging is terrible for an engine.
It could very well have been defective though.
You could have revved it too high too soon as well.

 

[qaart]

well i let it coll off every run no more then half throtle i was told to run it a little rich for more lubericating