I have the HF 8750 Watt Inverter Generator and I bought it in October 2022.  I just replaced the carburetor a couple of months ago because it was running really rough, needing some choke at high RPM's.  HF does not offer a replacement carb, only some very expensive gaskets and not even a repair kit. Fortunately, I found a direct replacement at Amazon (after finally ordering the right one 

) for less than the HF gasket set. The original carb looked perfect on the outside but it had bad corrosion on the inside. The solenoid needle at the bottom of the fuel bowl was badly corroded and the needle was bound up. The jet above is all covered in corrosion too.  Shutting off the fuel and running the engine until it runs out of fuel does not seem to empty the fuel bowl and therefore the corrosion.  I drained the new carb using the bowl drain which is a pain to do because there is no way to use a container that fits in the cramped space and most of the fuel gets spilled.
Replacing the carb was straightforward but required removing the fuel tank.  The inverter/all the electronics are epoxy sealed under the fuel tank as an assembly and the electronic throttle control connector is there.
On the other hand, my 4000 Watt Generac from 1992 that I  had replaced fuel lines, filters, plug, fuel line etc. last year refused to start. Finally, I figured out that the 1 year old "white B&S" filter would not let a single drop of fuel through. When I reinstalled the original 1992 "red" fuel filter it started right up 

. This B&S carb has never ever been drained. It has just has been run until out of fuel.