Every engine has a "powerband".
Its the range the engine makes power in. Most 4 stroke quads engines produce peak power and torque much lower in the range than a 2 stroke, but they still have powerbands.
Youre thinking of the peaky nature of a 2 stroke and that point in the powerband where they snap forward and start making power. Some 4 strokes are like that. Most of the race type 450s (yfzs, honda 450r, kawasakis, etc) are like that.