Peugeot vivacitiy needs high speed when starting

Hi Folks, maybe someone can help me. the scooter is original, and well maintained, 50cc. at the start you have to give an extreme amount of gas to get away, sometimes it doesn’t roll at all, then you play with the gas and at some point it starts slowly and starts slowly. Everything always with a lot of gas. the clutch I wiped out, the old looked still very good. But was obvious that it was on the clutch. But now the error has unfortunately not been fixed. have the Vari o disassembled, weights weighed and measured. The part cleaned, was actually not necessary. So the Vario is also ok. The strap is also as new. The box only ran 3700. The problem suddenly occurred. Who knows advice? Greeting immi