phoenix cruiser,
Maybe there is an issue with your power transfer switch. In my 2350 with fixed dinette, it is in the front bench seat, located directly above the generator itself.
geomusic,
I wonder if your Onan's altitude adjustment is set to high altitude, and you are now at low altitude, or the other way around. The adjustment changes how rich or lean. It is located on the generator. Remove the green access panel and see what it is set to.
We store our 2350 in a heated garage and never run the generator off season. I rarely run it in-season. The last good run under load was last August with a/c on for an hour, and all was well. I hear all the time about the need to run the generator off-season, but I never do. I figure they sit in unheated warehouses on shelves for years before they get installed.....right?
What little gas evaporates in the carburetor bowl isn't going to gum up anything. At least that has been my experience with all my lawn equipment for nearly 20 years. I store them without any prep in my garage, long before I had heat in there, and they always start up fine in the spring. 18hp lawn tractor, 8hp garden tiller, push mower and weed trimmer, are all now 20 years old and still run like champs. Even my 8hp snow thrower does great, and that works during the opposing season. I must be doing something right with straight forward general maintenance. But no storage preparations or off-season runs.
Ron