The case was changed a few months back due to the front bearing coming out really easy. If you take the engine apart, and you pull the crank out and stick a wrench in the case and hit the front bearing it will fall out.

The bad thing with this is air leaks and fuel leaks from the front bearing. Also it does not seem to have the power of a sealed engine. You can replace the bearing, or get the new case from Hobby Pro and put all the parts you have one the new case.