People are right on one count. The sucker is loud. Thankfully, neighbors are far enough away (and have their own rock grinders), that I can stick the thing between my vehicle and RV. I don't know how clean/dirty the power it puts out, but even when it ran dry after I closed the fuel petcock, it stayed at 60 Hz and 120 volts from the built in meter. At least I can use the circuit breaker on the front as a switch to disconnect/connect loads.
It is the best I can do on short notice, but I know that if the Yamaha can't be fixed, a 3400 watt dual-fuel Champion inverter generator (#100263) is definitely in my future, just because of the fact that I can run the fuel tank dry, run it from a propane cylinder for a few minutes to ensure there is nothing in the carb or lines, then put the thing away.