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It's a very small inside diameter, so you won't move a lot of air. If you think air is getting through, that should be enough to vent.
Probably just a leaking seal then. We've ALL had one, or more. I've replaced three myself (one on my ride and two on TheCaptain's).
It's straightforward...
There should be a small black plastic tube (like 1/8" dia.) coming off the top of the hub, headed for the engine bay and ultimately to the air cleaner housing. It tends to get brittle, and can be plugged, cracked, or both. Check it like any other bit of tubing; disconnect and give a blow or...
As you can see from the painful replies, it is always something coming up on these rides, but they make up for it in other ways.
Welcome to the club.
BDGR
Yup, pretty common.
When this happened to me the advice was to just find an NOS surplus halfshaft, rather than mess with pulling the old one and dismantling it to put on a boot. It is MUUUUUUUUCH faster to replace the whole thing, and when I needed mine they could be had for a reasonable...