OK- no smartass remarks please. I'm new to this bike game so excuse me if this is a stupid question. After a long ride today I return home and notice that there is this open ended pipe which originates from somewhere up under the fuel tank and just kind of hangs down between the rear spring and chain (I moved it out in the photo for a better shot). Now the thing is that I had a major service done last week and I know that this pipe was not like this before the service. Is this pipe supposed to be there? What is it's purpose? Another probably unrelated problem is that it now idles very low and sometimes cuts out when I stop at lights, even when the engine is warm (after more than 20 minutes of riding). I plan on taking it back to the shop on monday but thought I might get some opinions before I have to book it in again and waste more time (without my bike). Any advice is much appreciated.