When i changed my final drive oil, i noticed that the oil went under the cover at the top, ran down inside, and dripped out of the bottom edge. There is a flange inside, partially guarding the clutch from this, directing it to the back somewhat and down. Take your cover off and it is clearly seen. Maybe thats what is happening, just a guess on my part. As for brake dust, ive never owned a bike that constantly had so much brake dust, it seems to get everywhere to! I have hh pads for it now, ill change them out this winter and see what happens. Next time the final is changed, im taking my covers off first!