Thank you Jerry for the info, Matt Shears mentioned that also to me awhile back, that those Aluminum aftermarket Vents clog to easily, and how those aftermarket aluminum gas caps vent holes are too small, had to drill mine out to 7 mm, still left enough metal.
We drilled the one out on my uncles 500 4-stroke Suzuki as well. His is a mud bike though so we've got a little more than a crispy piston to worry about if it vacuum locks lol