Here's photo of carb-vent hose routing. It should go up and down between intake tubes from airbox and out around rear-shock. There's a hose-routing loop down there somewhere with vent-tube from crankcase and airbox.
I recommend getting a hose connected to that vent ASAP. I've had stuff fall or crawl in there and kept me out of points running (should've won last season!), due to sitting on sidelines messing with my carbs when I could've been racing!