Zip does not start after wintering

Moin, have a problem again with my zip 50 bj.94. Wanted to reactivate the scooter this year,as I currently do not have the opportunity to buy a car (still a student). Well, wanted to start the scooter again today,to bring it to the workshop on March 1st (technical defects) actually got going as expected, tried to start by e-starter and it didn’t happen. The scooter tries to start, i.e. the spark plug ignites and it just comes the typical e “noise” is created but it doesn’t start. It’s actually excluded that it’s on the fuel, petrol arrives at the spark plug, if it has been removed twice, it was always wet. So, any “congestion” in the pipes is probably excluded, what can it be that the scooter doesn’t run? p.s.: Battery is of course charged.