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The capped hose is a drain for the crank case ventilation. It is attached to a small chamber with 3 ports: drain hose, vacuum intake (from the air intake prior to the carb), and crank case ventilation. During the intake stroke, the vacuum from the air intake draws air from inside the crank case. Any oil that happens to come out with the air, falls to the bottom of the chamber and collects in the drain hose. Its important to leave the hose capped, otherwise your oil will foul up quicker (since you won't have a vacuum to draw in the air from the engine). You should check the drain hose periodically to see if there's any oil in it.
On my bike the fan definitely draws air from the front of the bike, through the radiator, through the fan, and out the back. Are you sure its spinning in that direction? I really can't tell by your pictures where the radiator even is on the bike.
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