Clutch basket wear, most vstrom 1000's end up with it sooner or later. Doesn't do any harm just gets more and more annoying. Mine is the newer 14 model, it started about 20k miles and got to the point I couldn't put up with it anymore at 33k. John sorted it out, in the link above from Mr Nick. Not to difficult to do, great info on the website and lots on YouTube also. Will cost about 300 or a bit more to put right.