Wow, things sure use to be easier! I stopped flying in 1990 and started again this past December. Back in the '80's thru 1990 (when I was flying a lot). I can remember building the airplane, taking it to the field, putting in fuel, starting the engine, leaning it out until it sounded good, setting the idle with the control linkage and throttle trim, then fly-fly-fly. No break in, no low idle adjustment, just lean it and fly. Have the manufacturers changed the way they make engines since I've been out of the hobby? I would imagine, like anything else in the world these day's, they probably made them better back then!