RE: Profile for a 55 AX
Flameouts on the 55AX seem to be pretty common, but they can be easily cured.
1. Make sure EVERY bolt, screw, nut, nipple, is tight. We've had several that were too loosely assembled from the factory. This unusual for an OS engine in general, but seems to happen often in the 55AX for some reason.
2. Use an OS F glow plug.
3. Do NOT run the engine too rich on either the high or the low side. A little rich is fine, but too rich will cause flameouts even with the OS F plug.
You didn't say what prop you're running, but the APC 13x4 (not 4w) works great for 3D flying.