Scooter only starts with spray.!?

[SE50_4_ME]

Hi all. On other Dio, it fires up for a second or 2, only if I spray some flammable spray like carby cleaner in the mouth of the carby. So I know engine and spark are fine. I suspect fuel is not getting to the carby. What should I do and check?
Many thanks.

[MrJumps]

Never spary anything into a 2 stroke it throws its oil mixtures off. start with the pet * take both lines off the carb and give a suck on the vacume line, if fuel ends up in your mouth replace the petcock, fuel should only flow when your suckn.