Yamaha Breeze carb help

[440challenger]

Workin on a yamaha breeze. Wondering where the vent / vaccum line is supposed to hook up to . Does it vent to the atmosphere or get plugged or go to a vaccum source? the line was missing and i can't find anywhere it could go. it doesnt have a vaccum operated petcock....


hose/port in question is circled in picture
Thanks!

[CSR400EX]

ive worked on a few of these, and if i remember right, it doesnt hook to anything, its just a vent or a overflow if it rolls over.