I have a Champion 9000/7000 that I bought from Costco a number of years ago. I was constantly fighting carbuerator problems because of aging gasoline mucking things up. About 3 years ago, I added a Motor Snorkel (
https://motorsnorkel.com/) which allows the generator to burn propane or gasoline. I now run it exclusively on propane, and I have not had single problem since I started running on propane. It starts right up every time. I start it every 3-4 months if I haven't used it. Champion now has a version of that generator that comes factory-ready for propane/gasoline use. The power output is slightly less on propane.
Also, I would strongly recommend putting in a transfer switch. I've got a 1-ton mini-split AC in my office, and the generator can run that, so I can at least get a little cooling when the power is out. With the transfer switch, I can easily switch between circuits as load requires.