I've got the same (FX) engine and just ran in a brand new example using the method described below. Works for my Enya CXs, TT PROS, and O.S. FX & AX's without any longevity issues or performance problems. SF and earlier, I might be a bit more judicious with....but I laughed when I read what the FX pham (in my case a sheet) said. Schnuerled CNC manufactured ABN engine in a rich four stroke?!! What an unnecessary waste of fuel & my time.

Just stick it in the model and fly it. Use a low load prop, set it comfortably rich (no risk of a lean run) 2 stroke, make sure you've got at least 20% oil containing a generous splash of castor for the first quart or so and after checking it'll hold stable @ idle and nose high full hammer, go fly. Try not to hammer it unmercifully for the first half dozen flights, then start gradually leaning it out over the course of the next half dozen. Just like modern cars, you don't have follow a rigorous mysterious "toads eyes, and leg of newt at 5 minutes past midnight only when the moon is blue" regimented run-in routine. Just take it a bit easy for the first hours running or so, make sure the throttle gets the occasional change away from CWOT., ...Oh, and don't load it with an oversize prop.