Hi, I have changed the front and rear sprockets (new washer on front sprocket) and chain on my WR450 2005 like 500 Kms ago and have been riding with no problems. The chain slack seems to be within spec, I have been measuring it since I changed the chain and sprockets. I have been riding so far with the lubricant that came with the chain and then eventually I decided to put some Bel-Ray Chain lube on it. Since then, I don't know if it has anything to do with the Bel-Ray chain lube but I was checking the bike the other day and I noticed some sort of weird oily lines (not sure if it is oil though) on the front sprocket. So, I decided to clean the front sprocket and go for a small ride, as I stopped the bike again, I checked and those lines were there again. I have also checked behind the front sprocket (without removing it) and there does not seem to have any sort of leak. The lines look like this: http://s1186.photobucket.com/albums/z368/LFADSA/?action=view¤t=sprocket.jpg Does anyone have any idea what this could be please. Any suggestions please. Thank you.