Confused about number of valves...

[5th_bike]

When I checked the valve stem clearance, I remember checking two rocker/stem distances up front (exhaust) and two at the rear (inlet) of the cylinder.
So, I was telling some interested people "it has four valves".
Now in the newly introduced "specs" page I read that it only has two valves (and, more or less superfluously, "valves per cylinder: 2").
Does each valve have two stems ? Does only one of the stems have a valve at its bottom end ? :??:

[primal]

Must be a typo. Look on page 3-25 of the service manual. You can clearly see 4 valves in the 3rd picture. As far as I know, it has two intake and two exhaust valves.

[5th_bike]

Must be a typo. Look on page 3-25 of the service manual. You can clearly see 4 valves in the 3rd picture. As far as I know, it has two intake and two exhaust valves.

Indeed, also the drawings on the next page 3-26 clearly show 4 valves total.

When checking the internet, the mention of "2 valves" for this bike is quite common, for instance at motorcycle.com.

But here of all places, you wouldn't expect it.

[Water Warrior 2]

If I remember correctly there are only 2 rocker arms but each one operates 2 valves. 2 intake valves and 2 exhaust valves. That is the reason for the 2 exhaust pipes coming off the head. Some people think the GZ is a vertical twin cylinder bike because of the 2 pipes.