hi i have had my 03 dr650 for over a year now and just lately i did an oil change and found aluminium filings in the oil so i went to a suzuki dealer and asked them about it and they recommended a new air filter so thats what i got and now when i start it up it sounds like crap like the piston is off balance and its rubbing on the side or something might be wrong with the gears so before i take it to a workshop to be robbed of a few hundred dollars i would like to know what might be going on?