I'm having the same problem with mine too, same exact color and year too! I ordered the new float and o rings so hopefully this will stop that over flowing.
found one of these in the dump. Missing a few parts including the oil tank.. think it will run with pre mixed fuel for a test run until I figure out an oil tank solution?
Idk if your familiar with treatland for scooter parts. They have the clone carb in stock for very good price. Run awesome. I made the same mistake with that ebay carb you bought.