I notice that your choke lever is in the upward, full on position, are you making sure to shut off the choke to the full downward position after 15 to 30 seconds after starting it ???...It will die out just like you describe if you don't.Oil is 40:1 I think, the head bolts are on tight last I checked but ig I can give them a one over. And here's a couple pics
And yes, do everything that Gordy just said here.First of all you should be running 25 to 1 with dino oil for 300 miles, then 32 to 1 synthetic oil after. Second, that spark plug is junk, get a NGK BR6HS spark plug.
I might add to this by saying to NEVER mix oil in gas in the gas tank...It will NOT mix properly that way and you may even seize up your motor.
You need to mix it in a gallon gas jug so you are able to shake it vigorously every single time that you add gas to the tank for a thorough mixture.
You want to use 5.12 ounces of a decent quailty ash free 2 cycle conventional motor oil such as Valvoline 2 cycle multi-purpose motor oil, to One gallon of gas, preferably an Ethanol-Free gasoline for that breakin period.
After your Zeda recommended breakin period of 300 miles is over with, you can then go to full synthetic 2 cycle oil like Gordy mentioned and 32:1 mix will then be 4 ounces of oil to one gallon of gasoline.