Spark plug wet, carburetor???

Moin in the round, I have the following problem… I bought a 50 mashie for my neven. I bought it already as broken. So far so good. Spark plug has spark and that enough. I got the machine today after I cleaned the spark plug also to run but it always immediately drains after a short time, and the spark plug is again and again wet. I also tried to turn the stand gas further out for more air in the mixture, but any How did it do nothing. Air filter is new, it can’t be. If I dried the spark plug and turned on the choke jump it on again and again Now to my question… Can someone tell me what else I can do maybe so that it doesn’t always run so fat??? Friendly greetings