Bought one of the cheap Chinese ones off eBay, had poor results, then bought the mini Mag. After a couple of turns either a finger over the carb intake to choke? It starts and runs very well.
It may pay you to get a few different types of o ring to start with, as the first one I used only lasted a very short time. I replaced it and now it is fine. Others seem to have had this issue also.
I run mine on Methanol with good results
Good luck.
Ian