I have recently bought a 2001 WR426 with an unknown number of Km's on it. I did my first oil change on it last week after having done three short rides and when I took the oil filter out it was covered in metal fillings. I wasn't too concerned though and replaced the oil filter, filled the bike with a synthetic oil and put a new spark plug in. I took the bike for another short ride (50 km's) and then drained the oil again to see if I could flush the rest of the metal fillings. To my surprise the oil was black and when I took the new spark plug out it was black as well (more sooty black than oily black, but quite fouled for a brand new plug with 50 km's on it). There were a few more metal fillings in the oil filter, but a lot less than last time. The bike also now seems to blow a bit of blue smoke when it's cold. Once it warms up it seems to go away though. The bike seems to run fine and has plenty of compression when I kick it over. So I'm wondering what my problem might be? Is it likely I've broken a ring and the metal fillings are from it or the barrel? I'm curious if anyone else has had a similar problem and what might be the cause.