Evan's right - it's a breather tube, and from time to time some drops of oil may drip from it. If you ever find that a LOT of oil is coming out (frequent drips or God forbid a stream!), then something is wrong.
You can put one of the UNI breather hose filters we sell on it, or you can tie wrap it out of the way to the frame somewhere. Just don't block it off.
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- Mike
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