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Jarek, mine looked about the same on My 16PX at about 50hrs with no catch can. Gasoline did the trick for me, obviously you need to be careful and dispose of the nasty gunk properly. You might find...

Nope, just the purple stuff that normally works pretty good when you soak greasy parts in it. I wasn't super patient and had plenty of gas around....so i ran a few quarts of gas through it....then...

+ 1 for gasoline. =D> I tried purple degreaser, and some other stuff....didn't work worth a crap.