what are these things found in my oil change ?

[stilkus]

Hello,
I just made an oil change to my CBR 1997 SC33 900 and to my surprise I found 2 metallic rings and an piece like a calcium stone. my last oil change was at the beginning of summer this year and there was nothing in my oil. I am really puzzled, I need suggestions where this could come from. the motorcycle drives and pulls like a train, wheelies and tops speed 270-280 which isn't too bad given this bike has almost 63,000 km. I forgot to mention I changed the clutch last week as well

[RhynoCZ]

The sump plug washer? Although I'd expect a copper one to be there instead.

EDIT: What Robby says makes more sense.
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'87 Honda XBR 500, '96 Kawasaki ZX7R P1, '90 Honda CB-1, '88 Kawasaki GPz550, MZ 150 ETZ
'95 Mercedes-Benz w202 C200 CGI, '98 Mercedes-Benz w210 E200 Kompressor

[Robby]

My best guess are that they are bits of a clutch spring, and possibly a bit of clutch friction material.

[RhynoCZ]

^^^^
Yep, definitely that.
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'87 Honda XBR 500, '96 Kawasaki ZX7R P1, '90 Honda CB-1, '88 Kawasaki GPz550, MZ 150 ETZ
'95 Mercedes-Benz w202 C200 CGI, '98 Mercedes-Benz w210 E200 Kompressor

[stilkus]

thanks a lot, I think it could be parts of the clutch yes cause some plates weren't in their best condition when I took it out.
thanks again for your thoughts

[Keir]