As far as I know the following only applies to motos without side covers or air boxes, an aesthetic theme usually found only on custom machines, not factory stuff. I've been told that CV carburetors equipped with pod filters suffer from air starvation when the bike starts reaching higher speeds, sometimes starting as low as 25mph, this due to the fact that the rush of air created by the bike's passage creates a vacuum behind the pod filter itself. I've heard that to combat this problem back in the day some race tuners would simply replace the pod filter with an unusually long velocity stack (the extra length creating a continually present column of air inside for the carb to drink from) or place the pod filter on a tube that extended all the way out to the frame rails (where the vacuum was not present). Starting at 7:05 you can hear this old school builder and racer explain in this Bike Shed video. My question: is this air starvation problem only present on CV carbs when equipped with pod filters because a CV "pulses" as it draws air? Or would something like a flat slide carby experience the same issue? Vintage, air cooled, carbed singles are my favorite engines of all time, so I pay especial attention to all their build details when I'm observing race bikes and similarly performance oriented machines of the thumper ilk--and I don't remember ever having seen one equipped with anything but a simple pod filter, even the builds from tuners who specialize in nothing but high performance thumpers.