Sorry for my poor English...
I,ve bought two months ago 9,9 Johnson 1988y. ( Belgium)
Because engine was not in use during two years I,ve cleaned carb ,changed oil in gearbox etc..
But... inside carb in the end of throat from outlet side ,there is some bronze or cupper ring changing throat diameter from 21 mm to 15 (aprox).ring is 1,3 mm long . What is it??? on the pictures of carbs ( OMC official parts catalog) there is not any ring...in any kinds of 9,9 carbs ( there are two kinds of carbs for 9,9 and 15 HP only but different is inside carb body (different diameter) not by any rings...
There is a two plastic cover kind carb ( like in models from 1989) and mark on body:6KW.
andrew
Warsaw
Poland