If I'm guessing right... That is a watercooled 50cc 5 speed CDI ignition fully street legal mini motorcycle...
And I believe it has a real carburetor... With a "pilot jet'.
It is probably clogged.
It is a small brass jet... to find it you pull off the float bowl and turn over the carb..and it is down inside a hole and you need a small narrow blade screwdriver to get to it.
If that is not it try a brand new plug like Ron said.