I just purchase a Royal Trainer ARF never flown with an Alpha engine installed. From my library, the Dave Gierke Engine Guide publication #2, has put the whole breaking procedure
in a great form to follow. While it has been said that the EVO engine was broke in at the factory,
what harm would be done if it was run through Dave's procedure? I removed the engine, and
ran the breakin. Installed it into another trainer which had been crashed by another pilot that
I rebuilt, and has three test flights on it. The castor oil dripping out of the muffler after each flight has a color similar to normal castor oil in a bottle indicating to me that the engine is broken
in for max power use if desired. Moorman is right in saying that some engines need a gallon of
fuel run through them to finish the wear in necessary to give them a long operational life.

My EVO .455 really runs well, and did not give me any dead stick landings. You could use this
engine, or the .46, and be happy. My preferrence is for the Thunder Tiger Pro .46, but then
again, I really like my GMS .47 engines as they seem to have a nice bark to them when going
from full throttle to idle. I lost my first one on a fly-away.

Enjoy yourself with the new plane and engine of your choice.

Rich S.