For about 35 years now I have mounted my engines on planes and flown without any problem. It is true that on ABC engines that they need to be cycled somewhat, but I do that with one run on the ground. The rest I do a quick tune up, set a little rich and fly. Very seldom as an engine cut off on me, if they do I land and retune. In my opinion, bench running engines at home pisses off the neaighbors, waste fuel and cuts into my flying time -