You really need to do some readiing about the Banshee and 2-strokes in general. A service manual is your friend. Find someone local who is familair with the Banshee. If not get the book. Please don't take this the wrong way but......the is no such thing as a "Power band" in a bike or any 2-stroke. All that is happening when the bike seems to "kick in" is that the engine is coming on the pipe and the bike is in its power band or the area in which the engine is running at its optimum performance. I'm sure someone can explain it better than me. These 350 engines are great when they are running at their best. Get to know it and you will be a very happy camper.