Brake dust
Willy,
I of course have no idea how much actual dust you have, nor what you consider to much. I can only recall seeing brake dust on my Liner and comment on that. Maybe a differant line of thought. The wheel rim has a wide flat surface and seems to be prone to collecting a lot of dust. I may also be braking excessively with the rear brake. I sometimes drag it a little in a tight slow turn, I use both brakes to stop normal, maybe should be putting more tension on the front brake.
With all that said I think I just need to clean it more often. I like to spray it off with a pressure washer then clean it with Yamaha's spray cleaner polish.
Dave