Wrong. Full throttle and low rpms = lugging the engine, the worst possible thing you can do to any engine, broken in or not. Lugging an engine will pound the bearings to pieces very quickly. It does need full throttle, but only in short bursts, to seat the rings. After that, ride it normally for the next couple hundred miles, varying the throttle and giving it a lot of breaks to prevent overheating. The problem with those China engines is that no matter how you break them in, they have a max lifespan of 1500-2000 miles. A stock 2 stroke 49cc Puch moped engine OTOH has a lifespan of over 50,000 miles. Quite a difference, and all because of quality.