Don’t rush to take it to the service center. Carburetor adjustment is a standard procedure, and the manual will help you do it yourself. I had the same problem with my lawn mower last year. The key to the ManualMachine instructions is to find the „Maintenance” section. There’s usually a clear diagram that shows how to adjust the carburetor: turn it all the way in, then back out a certain number of turns (usually 1.5 or 2). If you follow the instructions, the lawn mower will work again right away. Also, check the fuel filter’s condition. If it’s clogged, no manual or screw adjustment will help because the mixture will still be too lean. Have you tried resetting the settings to the factory defaults using the diagram you found?