How To Control Generators Noise

As we know that, Generators make very noisy. The main reason is that generators use their engines to generate electrical energy.
As usual, we set the volume of the sound between 60 to 90db. But if our generator is very cheap then its sound will be louder than 100db.
Anyone help me please. I have an Honda EU3000is Generator which is too much noise. If anyone have the solution is this problem so please guide me.