The machine arrived with a faulty fuel tank and I sent it back.. Nobody cares and nobody informs.... Unreliability and lack of professionalism.... I need the machine for my profession.... It has been 1 month....

The machine is intended for amateur use.
The manufacturer recommends a oil-gasoline ratio of 25:1 (!) for the first 20 hours of operation and then a ratio of 40:1.
Before the first use, I let it idle to burn half a tank for a basic engine break-in. Always with quality oil for two-stroke engines and fresh gasoline.
It started very easily.
Then I burned 2 tanks cutting weeds, always with the recommended initial oil-gasoline ratio of 25:1.
After about 30 minutes, I would turn it off to let it cool down. It has power, but I have the feeling that it could perform better.
I believe that with a ratio of 40:1 or 50:1, it probably won't heat up as much and the engine will work with its full torque. I will come back with my impressions in the future.
Finally, for anyone planning to buy it, I would suggest replacing the head with an aluminum one, as the one it comes with is plastic with automatic trimmer line release.