That hose OP asked about diverts water from the exhaust water jacket but it still goes into the same exhaust stream. So there would be no difference in power when that hose is reconnected...
Unless you were to send that water overboard via a pisser, but that's a pretty small line for a pisser
Yea I dont know how critical that line is, but Yamaha put it there for a reason so i would hook it back up
I believe that is correct that the water box is just a muffler. Maybe it is supposed to provide slight back pressure too? Im not too sure
... but after the initial startup, it's just a secondary water line transporting hot water from your head into your exhaust.
The majority of hot water from the head goes out the fatter water hose on the other side of the head, that water fills the exhaust water jackets including that rubber...
I believe that hose is meant to allow air to escape the cylinder head water jacket. Notice that it is at the highest point of the head when riding. If you allow all the air to escape from the highest point, then you ensure that water fills the jacket entirely.
Also before the water jackets...
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