So Dede's got about 5K on her new to her 2005 ST1300 now. Not always, but most days after riding or coming to stop in traffic she says she can smell what smells like burning rubber faintly. I'm thinking a little bit of spilled oil on the muffler... I've only smelled it once and I guess it did smell more like rubber than oil. Any idea what I should be looking for? Never smelled this on my 2006 or my 2007.