I broke in my 46AX's by starting them, and running rich. Then, throughout the first tank, lean the engine out so it peaks, but don't go too lean. Let it peak for about 10 seconds or so, then back to rich.

Repeat the process till the tank is empty.

After that, just fly it, but leave it a tad on the rich side for the first 3 or 4 flights.

Then tweak it and have a ball