I found this a few weeks ago. It bolts to the generator mount. There is an RPM adjuster screw. The shaft goes all the way through to drive other devices. No name has been found yet.
You heard about the policeman who stopped the TT manure truck for speeding and asked the driver "Don't you have a Governor on this truck?"
The driver said "No, it's just the Manure that makes it smell that way!"