Above is a great tutorial that shows how to quieten a generator provided by BCtruck, rebuild, repair,repurpose. Most generators can be heard from a far distance and are usually run within a close proximity to the house it is powering. Being able to lower the sound level created when a generator is running can be a lifesaver and a ear-saver.
If you have an issue watching youtube videos due to your internet connection, alpharubicon did a great pictorial on the process seven years ago. Just make sure not to run this indoors.