i took the n&s out and cleaned it but i did not see any debris. it still flooded after i put it back in and lowered the bowl pretty low.the o ring looked hard and shrunken to me.i will get new parts for it,but the good news is,let me start from the beginning,i bought a 850dp in the 80s ,used it many years happy with it,about 7 years ago it did about whats happening now,so i sold it to a buddy and i bought a new 850.i have not been as happy with this one,its not as snappy as the old one was.after taking it apart several times i was ok with it.i called my buddy yesterday who i sold the old 850 to 7 years ago and he still had it and he had just got it rebuilt.he let me have my old 850 back and i threw it on my car and i didn"t have to touch it.very crisp like it used to be.im going to run it and keep the newer other one for a spare