Changed the oil for the first time on my 98 916 (bought it a few months ago). Here is what I found stuck to the drain plug (among other metal shavings):
Thanks for all of the quick responses!! I got in touch with the previous owner. He installed MBP collets in it, so he said it must've been from the owner before him.If its extra your in luck. If its one that popped off (guess thats possible) either way I'd say don't start have valves checked. What the heck if you just bought it who says you can trust the last owner actually adjusted the valves nice thing to do to a new to you bike
I would be very worried if a piece of clutch spring got into his crankcase. There would be bigger problems afoot.The size reference would be nice. It looks proportionally too fat for a closing shim retainer, but I'll admit that Desmo valves are new to me and my exposure to the parts involved is limited--but not zero exposure. Bit of clutch spring could match the proportions.
Does either end have indications of failure or breakage?