1988 Johnson Evinrude CC 60 thru 75 outboards Service Manual, Page 106Get this manual
Carburetor Body f411Check all drillings and passages with syringe filled with isopropyl alcohol2Visually inspect all gasket surfaces for nicks or irregularities3Check for excessive throttle shaft playCheck for throttle valve misalignment f51
4If necessary, remove the calibration pocket core plugs to inspect the pocket for damage or restrictions Drive small punch not more than 18 in(3 mm) through plug and pry out