This is what Rody said about this method… he also posted he runs a 7X4 prop on the motor

“Anyway, if you still want to do it in this way, I think in this way you cannot do a lot of things wrong.
So before you start to run in an engine I suggest you cover the cooling-head with something so the engine heats-up properly(without the cover the engine will stay too cold).
Then start the engine and let it run rich at full throttle for 2-tanks at a temperature of about 80°C.
Then 2 more tanks at 90°C.
Then 1 more tank at 100°C.

After this your engine is almost run-in, however you need to finish the rest of the running-in in the car for about 2 more tanks and you are then ready to go.
With the engine full-throttle, you are sure that the idle needle is not in front of the spraybar and so you are running the engine really on the setting of the main-needle and so are also sure the engine will run rich.
Also more fuel/air will go through the engine with full throttle so a better lubrification.”