I have owned both an LA .40 & .46, and a close friend has a .40 & 3 .46s (silly lad). Of those six engines, only my .40 has never flamed out. One of my friend's .46s has literally never run through a full tank of fuel in flight -- it quit every single time. It is now a spare parts supply. I also had a .46 FX that flamed out often enough to be a serious annoyance.

We both have been modelling all our lives -- we both know how to tune engines -- I no longer own any OS engines, & I no longer have trouble.