Further Experimentation:
The 20-amp GFI outlet I got refuses to work with the generator. I didn't have any other spare outlets around, so I just directly connected the bare wires up to a Kill-a-watt.
With that, I was able to measure volts, amps, and hertz. The generator is a little erratic with no load - like a lawn mower when you aren't running the blades, you can hear the engine speed change up and down.
I load tested it, first with a 250 watt heat lamp. When that worked, I tested it next with an electric space heater. That heater has a low, medium, and high setting, which is actually 500, 800, and 1250 watts.
I fired up the generator, then turned the heater to low. The genny speed increased, but smoothed out as well. As I turned the setting on the heater up, the speed (and loudness) of the generator increased.
I ran the heater at 1200-1300 watts for about 5 minutes or so. The generator had no problem, although its exhaust started melting a hole through my plastic cart....
