1990 Johnson Evinrude "ES" 9.9 thru 30 Service Manual, P/N 507871, Page 78Get this manual
Carburetor Body
L!:I isopropyl alcohol2Visually inspect all gasket surfaces for nicks or irregularities3Check for excessive throttle shaft playCheck for throttle valve misalignment4If necessary, remove the calibration pocket core plug to inspect the pocket for damage or restrictions Drive small punch not more than Va in(3 mm) through plug and pry out Install new core plug with the convex side upSeatthe plug using flat end punch and plastic malletApply Gasoila sealer, OMC PIN 200763, to the rim of the core plug after it is seated5If necessary, remove the lead shot to inspect passage for restrictions or leaks Gently pry up on lead shot with sharp edged tool