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Is your Champion "Weekender" a Inverter genny with a pure sine wave output that varies RPM depending on load? Or a contractor style like these 3500/4000 with a dirty modified sine wave designed to run simple electric motors (fans, drills, saws, compressors), resistance elements and lights?
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It would be a mistake to dismiss all non-inverter generators as being only capable of producing crappy power.
Among the various non-inverter models, there are huge variations in power quality.
Some models use a very basic "resonant" voltage regulation scheme that only employs a couple of passive components.
Others have an automatic voltage regulator ("AVR") circuit that compares the AC output voltage against a built-in voltage reference, constantly adjusting the rotor winding current to maintain constant output voltage. Some models have power quality comparable to the best inverter models.
This particular Champion model has an AVR circuit, and produces good power quality.