Piaggio NRG POWER DT Ignition time??

Hello with each other, I am still looking for faults, because the scooter unfortunately still doesn’t start. Spark is there, fuel is there, compression is at just under 8 bar. Exhaust is changed. And yet it doesn’t want to start. It’s not two things I want to check. 1. Oil quantity Can it be that if there’s too much oil, a mixture is created that won’t be ignited with the spark of the spark plug? My plan is to find out in which I give the carburettor premixed fuel and for as long as d or do I harm the carburetor, or the engine? 2. Ignition time According to the manual, you can check the ignition time with a strobe. I can borrow such a strobe. I am unfortunately not good in English and have the manual only in English. How do I adjust the ignition time? These are two small screws that hold the Lima, but I can not adjust anything, or do I look at the wrong place? I need a short description of what I do and what I do. Greetings Alex