1992 Johnson Evinrude "EN" 9.9 thru 30 Service Manual, P/N 508142, Page 97Get this manual
Check for correct positioning of the float levelThe float level controls the height of fuel in the float chamber and is critical with regard to carburetor calibration and function Turn carburetor body upside down and hold so gasket surface is horizontalThe weight of the float will close the float valve needleRest OMC Float Gauge, PIN 324891, on gasket surface and slide gauge up, next to floatTop of float should be between notches on gauge Igl Use notch that is indicated "25 thru 75 HP Be certain gauge is
not holding down the float If float level is not between the notches of gauge, lightly bend metal float arm to adjust levelBe careful not to force float needle valve into seatCheck for correct float drop dimensionThis dimension affects the full opening of the inlet needle and is critical to correct operation of the carburetorWith carburetor body in normal running position, the float must drop open to dimension shownTo adjust, bend tab on float arm where tab contacts float seat