Re: what did you do to your motorized bicycle today?
Just a simple test before you go tinkering with the carb and manifold:
Try engaging the enrichner (choke) a little at a time and see if doing so improves the condition. If it does, then yes, you are running too lean. If it gets worse then you are running too rich.
"It's a chinagirl. It's a sometimes fun little engine that often will break your heart. It's disposable.
Does not come with a fortune cookie."