I have an Onan 5500 that has always started easily and run fine. Has about 240 hrs. I have a guy doing some inside work today so I showed him how to start it and turn the heat on as it was cold. He ...
The governor adjustment would be the last thing on the list (although very good to know). Check carb, fuel pump, fuel filters, add Sea Foam, etc. Mine was the fuel pump. But yours seems to be a pattern when not under a load.