I have three husaberg bikes that I just recently purchased. 1998 fx600, a 1999 fx600, and a 1999 fc501. All three of these bike have been sitting for who knows how long. I cleaned the tanks and carbs out and changed the oil. they all fire up and run, but I think the clutch on at least one is going out. I put 10w-40 castrol in them. I later read they are supposed to run sinthetic. I was wondering if this would hurt the clutch plates. I also had some fine metal in the tampon filter, looked like glitter with a little like fabric like material... Is that normal? one other thing, do all three bikes have the same clutch in them? thanks .....