rear of the tank? looks like its the airbox breather. If you're getting alot of oil out of it the could be time o change the .... cant remember the name... oil pressure switch gasket? on the other side of the engine. at extended high speed oil can leak up to the airbox from the engine and out that drain pipe. I had mine chaged not that long ago. too much/many long motorway rides. it nac go in other ways too, you can also get oil out of it for other reasons too. but I think thats what youre looking at. youll get better answer out of someone else here no doubt. its no biggie, if the oil gets more sonstant then might be a concern, also keep an eye on your oil level
theres actually a plug you can put in the hose an now and then lets the build up out
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