Hello, i don’t know if this picture is available to view for you guys. But it’s a picture of a Polaris trail boss 250 carburetor. There’s this black little nozzle on it.. I need a new carb for my quad and the carb I have now doesn’t have that black nozzle so I’m hesitant to getting another carb because most of them have this black nozzle. Can anyone explain to me what this black valve on there does for the quad? Would it be a problem if I used it for my quad now?

1992 Polaris Trail Boss 250 4×4 Carburetor 91 92 93 94 95 96 97 98 99 | eBay

There is the link for it if that is easier.

Thank