well.. do pay some small amount of attention to her.. but this is important! Anyway, all will be forgiven when she takes it for a spin..
i'd'a suggested you swap carbs a while back if i was aware you had a spare to swap..
The loose screws around the reed block bugs me.. tells me someone was deep inside there messing around and didn't know or care enough to button it up tight.
I'd take a real close look at things for telltales . Did they split the case? Maybe remove the flywheel, stator and everything? Mangle the carburetor's internals?
Since closing what must have been a gaping vacuum leak made no difference (??) something at least as offensive is hiding someplace.
This is just moped school. You're having fun and learning stuff that one in a million people know. Don't allow a moped to defeat you or your sorry ass will live in shame for the rest of your days.