Bad gas acceptance and loud screaming

Tomorrow, I have now taken the scooter out of hibernation and samit begin the problems I had displaced again in winter. It starts perfectly. Runs smoothly. Turns also nice up to the final speed and keeps it nice constant (approx. 60km/h). Now the big BUT: When turning high he starts to scream at about 40/50 km/h like crazy. Will now try to record the noise with mobile in the helmet compartment, I hope that works. It is really a very loud That’s what he does about 2-3 times for 2 seconds, then it’s gone. I have to turn it up ONLY the first time, quite rarely the second time, then not anymore. Only when he is cold again and I leave him again. After this first time he turns up full incl. screaming after the first time e.g. at the traffic light or junction from 30 hardly takes any gas for a few seconds, before he then pushes off. In addition, he is restless at full throttle, feels like you are It’s minimal, it’s not visible on the speedometer, but it’s annoying. It’s all original except for the exhaust, which is open. Someone’s plan? Coupling incl. bell and belt I changed last year, that didn’t bring anything.