I picked up a Chinese carb for my 200S. At first glance I noticed the overflow port has a brass plug in it. I'm assuming this needs to be free to vent any fuel if needed?? Anybody have any experience or any feedback on this? I realize that the port on the carb may not be called an "overflow", but it vents or at least on the OEM carb it has a vent tube connected to it. Seems like I've seen some fuel vent from it in the past (oem) TIA