Harbor Freight Predator 3500W question

Harbor Freight website has manuals available for download for most products. I usually read them before purchase to answer questions like yours. I purchased the 3500 last year and am extremely pleased. I wanted to have power to run the house furnace and pressure pump for my water storage system in case of a power outage. I checked voltage and frequency with an oscilloscope, loaded and unloaded. Its a perfect sine wave and frequency was always exactly 60.02 Hz. Voltage varied about 5V. It's a bit heavy but not so much that I can't lift it onto my pickup tailgate or put it in the cart behind my lawn tractor. It's very quiet and easy to work on. I took it apart for inspection and found the quality to be good. My only complaint is that the fuel shutoff and ignition are combined in one control. I added an ignition bypass switch so I can keep it running to drain the carburetor. There is a fuel bowl drain but it requires taking the side off to access it.

Carl