Yep.
1st issue with my 1st prototype was the engine case was made of too soft of aluminum and ater some run time the bearings started to get loose ( wearing the case ).
Second was two failed ignitions. ( I am running a RCexl ignition now ).
The new harder engine cases did not perform as well as the 1st prototype did. ( engine lost 200 - 300rpm ).
Now it seems to be running fine, I just need to put more time, time, time on it.
But since deer season is in, all my planes will not be used till around February. ( maybe one or two times on a nice weekend ).

Jody may have some more issues with his.
Maybe he will chime in.