Well for the power surge, thats for carbed bikes, I know that first hand because it happened to my ninja 250. It causes this because you get that extra air and whatever fuel there is in the intake body is quickly mixed with all the extra air that is not intended altering the fuel/air ratio and...
2 hours seems a lot of time for plugs which are a 5min job. Putting the air box wrong will just mean that more dust will get into your engine, which is not good but not fatal. You oil will pick up most of the stuff and turn black faster. The only issue I can think that may come out of this is...
Lay off the junk, eat more protein and fruits, diet is perhaps the most important factor in good health, thats y the Japs live to a 100. Can't believe they even have pensions there
Let me start of that its just RPM (Rates per Minute), its plural. Next, demand your money back and make a scandal at that rip off dealer. If they have not fixed your bike they deserve no pay, ask to speak with the manager and be mad. If its a real dealer you should be refunded or get your bike...