Drain hose for the stock air box. It should have a plug and wire retainer at the end. Empty it at every oil change.

Good hunting

Here is another answer:

It is the drain hose for the compartment in the air cleaner that collects the oil spray from the engine breather.

Drain it when you change your oil.  It should have a tie that holds it up out of the way when you are riding.

Thats a no sweat thing,, dont bother, let it hang, drain it at oil change & go,, OR do like WD, leave it open,, its not as if its gonna belch a load o oil on the tire & dump ya..

found a factory clip at the back of engine block I believe that is where you can tuck the hose out of the way thats where I put mine anyway so it wouldnt look like a excited horse with it hanging down like that  

If you install a crank case breather filter will you still have to drain it at every oil change?

justin_o_guy2 wrote on 07/29/13 at 10:50:52:


Just be advised that, if you leave this hose unplugged, the airbox will now be able to suck in a small amount of unfiltered air.

I'm just sayin'.

There are supposed to be two tubes that hang down. One is about half an inch in diameter and should be plugged: that one is the air box drain hose. The other is smaller, is not plugged, and is the battery vent tube.