This is what washed out of the screen and into a paint-filter. Several of the tiny pieces were ferrous. The "skinny" length of foreign-material; I think is gasket material. The other
wider long piece is a sliver of brass shim-stock (?). This is the same material I make the Brass Floats out of. It had a curl to it so it is clearly a "trimming" but how it got into the pan is a mystery to me. It was most likely caught in what I thought was a clean rag and perhaps fell into the top of the engine during a valve adjustment/check, at some point in the past. The majority of the material found in the screen appears to be "fuzz" from paper-towels and rags - the same type of material found in my fuel filter (if you remember that article) Go Figure!
I've got 6 new header gaskets ready for the re-assembly but am deciding as to whether I'll bolt the pan back onto the original gasket or buy a new one. I'm in no rush to get it back together if I have to wait for a new gasket but have had good fortune and positive experiences re-using intact gaskets. NOTE: I called the local Kawi. dealer and was told that Kawasaki no longer has them in inventory. Fortunately there are lots of other sources but I find some of the prices plus shipping, quite ridiculous for what you're actually paying for. It would not be difficult to make one so I may opt for that.
I'm going to glass-bead the O/S of the pan to remove the age-stains, will polish the O-ringed elbow, pan-bolts, drain plugs and touch-up the already polished filter-cover and put it back together when I've decided about the gasket. This is an easy one day job and there's nothing to be intimidated about.