2robinhood

The pictures that " soarrich " posted are not a CRRC Pro GP50R engine.
I had a prototype GP50R for testing. S/N 0005
Went trough two engines with a too soft of aluminum engine case.
The bearings started to get loose in the engine housing.
Crank, connecting rod, bearings, cylinder were all from DL-50's ( Pre DLE-55 ).
CRRC made their own engine case and there own ignition.
I replaced my ignition with a Rcexl after two failed CRRC units.
Went through some issues with prop hubs ( prototypes were blue, productions were red ).
1st prototypes ran super strong, 2nd and 3rd had less rpm's (-300 ) with the same exact props.

Here is pictures and pictures of it ripped down for repairs.
Compare the machining of your engine to a prototype.