An RC buddy of mine flies this engine and has many problems with it.
First, the chrome liner peeled off and he had to send it in for replacement - THIS was during break in on 30:1 Pennzoil 2 stroke oil.
The replacement engine runs very erratic. I have helped him with the engine and it is my opinion the design of the engine makes it run too hot.
The carburetor and muffler are too close and unless there is NO FIREWALL directly behind the muffler, the engine gets hot and vaporizes the fuel in the carburetor, leading to lean runs and erratic needle adjustments.
As I do not own the engine, and have only helped my friend with his, these are my second-hand observations.
Most of the DLEs I have seen running, run well. This one does not fall into that category.
Good luck.