All good questions and points.
The AC starts easily on shore power, even 20 amp.
The generator starts fine runs fine, except with AC load.
I have a volt meter and the volt output is 125, no load.
The tech gave me a hotter spark plug number to use.
Didn't think about the spark arrestor.
Gas is fresh.
Will try running the fan before starting the compressor for cool.
We are in the mountains, so altitude is an issue.
Thinking of going to the next size Champion. 5000 watt I think.
The tech had me turn up the rpm, but without a hertz meter, or rpm meter we really don't know if it's in spec or not. His words.