CPI GTR 50 LC BJ 2004 2T – knocking noise from engine area

Good evening, I have a CPI GTR 50 LC BJ 2004 2 clock motor (Euro 2, Minarelli lying) I was preparing the scooter again. There were only two covers left. Now my luck left me and the scooter started to make the sounds shown in the video. The previous day the scooter ran liquid for about 30 km without making any troubles. https://youtube.com/shorts/kaIidcteVpU?si=SuKIH0U5o5u3qc41 To sound I have from a self-proclaimed hobby screwdriver (a Bowd I have not checked the oil pump yet and honestly don’t know where to do it. I might need a video or a guide (not yet found) to check the oil pump so that I can find a possible cause. Are there any other parts that I need to check now due to the noise? I’m for every tip / advice/fer ndiagnosis grateful ! Greetings Luca