Hi,
yesterday I had also some metal flakes in my oil screen.
And it was "light" metal. No steel.
I checked my camchain again and as I said before, the
chain scratched my crankcase. So I changed the chaintensioner plastic guide to the new one of 03.
The distinguishing feature is the colour and the shape. The old one is beige (dark yellow) and the new one is black.
J-jet-tim, yes first you have to check your chain tensioner - have a look if it´s in its end positon. First step is to unscrew the screw in the middle, afterwards you have to disassemble the whole tensioner. There you can see
in which position the notch is. If it´s already in end position the case is clarified, I think.
I can´t believe that it has to do with the aluminium cam sprocket, if you have one at all. Sorry I doubt it.
Otherwise, I didn´t hear about problems of the pre 2001 engines in that way.
By my experiences with older engines I can´t confirm the theory about the cam sprocket.
In former times the alu cam sprocket wasn´t worn out too quickly. And: they used it for over 10 years!
Biggish, you should also check your cam chain tensioner. It doesn´t take too much trouble or let me say time to spend on it.
best regards
hribman