___Is there supposed to be a tube connecting to this? The spout (circled red) is on the air intake.

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Liquid drain for the air box. just a hole for any rain that gets sucked in.

___These were connected to the gas tank, and I assume it's normal for them to be hanging down. But, what is their function?

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Drain tubes, one should connect to the radiator overflow, one should go to the pan around the gas cap (incase of overfill) etc OH and your idle adjustment knob can be seen in this pic.

Your questions need a bike model, and more specifics. There's 3 black housings in the pic asking what the black housing is. The one with the large tube coming to it is your t-stat for the motor. The one with the bleed valve looks to be a hydrolic clutch in. The one with the shift pattern is trans inspection?


Looks like a pretty stock gixxer but that's just a guess.

If you need a shop TFOG is the one I'd recommend also.