After last seasons riding I decided to do some work on my engine. I have some oilleaks and some noises that I wan't to look into. When I took out the small oilfilter on the right side i saw quite a lot of small metal pieces. The main filter has no metal i it and is whole, its the strainer type not the paperfilter-type. No metal in the oil either. Found one piece of plastic. Could it be that the PO never cleaned the side filter properly? I will check the cam chain guide anyway because of the plastic, but are there other things that could leave metal in my side filter?