A good starting point might be to do some reading about the cons of using an ethanol fuel mixture, while the scooter will not be used during a long, cold winter.
In short, the fuel mixture gets stale, evaporates, and glogges up everything - including air channels. You basically need need to strip everything, and use a carb cleaner to spray all channels and components according to instructions. Then blow it off with an air compressor.
If you haven’t changed the fuel filter yet, it might help to drain the fuel tank, replace the fuel filter, and re-fill the tank with fresh fuel. Remember, the clogging process that took place inside the carb during the long, cold winter., also took place inside the fuel tank when the scooter was stationary.
I am a member of several motorcycle groups in the US, and it became quite clear that ethanol is causing all sorts of carburetor problems when motorcycles don't get used for long periods.
In our country we don’t have ethanol fuel mixtures, we use our motorcycles and scooters almost 365 days per year, and we hardly ever experience carburetor problems.
