Scooter drives only half-gas Piaggio 2 clocks

hello people. I am it again. my scooter makes new mucken again. on 31.8.22 have been refueling cheaply at aral, no E10. then I noticed that the scooter only drives half-gas. if I give full gas, it feels like, as if he swallows himself. he doesn’t want full gas. scooter starts normal, drives quite well to half-gas, but after that he just doesn’t want to anymore. scooter is a piaggio zip 2 clock from 2015. on the scooter is all original. nothing tinted. before kur zem once said goodbye to the fan wheel in the variobox. gave a big bang. parts bought and built in at the time. everything was good until now. I am grateful for every tip.