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I absolutely agree with Monte. Load it with a 50w blanket or something. Only when mine has a 50 or 60 watt light globe going does it settle down into a groove. Once it's there it's quite stable. Power from these is typically very dirty (bordering on filthy), but a decent spike filter will at least protect you from over-voltage. It will not, however, cure the frequency and AC voltage regulation issues though. I've measured my GMC 750 watt unit and it wandered from 55 to 65 hertz and 180 to 270V AC. A pretty wild swing!
Nevertheless, I use it to run chargers and stuff without problem. I wouldn't run anything sensitive of it, but rather use a decent pure sine wave inverter off a good large battery.
Having said that - my only other advice is to throw out the spark plug that came with it and buy yourself an equivalent NGK. You'd be amazed at the difference that can make. Mine starts first time, every time, and has now clocked (logged) over 1,500 hours on our farm. Not bad for $99 at the Bunster. Make sure that you run it dry to turn it off - don't leave 2-stroke in the carby for any period of time. Turn off the tap and let it go until it stops.
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