I've had such good service from my Lifan motorcycles that I bought a Lifan Energy Storm 2000 watt inverter generator. What a disappointment, I returned it and bought a Wen 1250 watt inverter generator. The little Wen is excellent! Quality is much better than the Lifan. Starts super easy, runs smooth and quiet.
The Lifan engine was a 105cc clone of the Honda 2000 generator that uses a cogged belt running in oil to turn the single lobe cam. The Wen is a 60cc clone of the 50cc Yamaha engine that has a gear driven single lobe cam and pushrods.