Tune it has Pat says, and here is a quote from Pat as well.. Bring it to about 2500-3000 rpms or so with trim, lean peak the low needle, then check high. GO FLY!
There is no reason to set a gasoline engine with a rich needle setting to break it, you do that with oil percentage, such as 32:1 for x many tanks, and such. Running a gasser rich will only carbon up the engine and potentially foul the plug.