2003 Johnson ST 6/8 HP 4 Stroke Outboards Service Manual, PN 5005471, Page 105Get this manual
FUEL SYSTEM
CARBURETOR
Install the hinge pin, float, and float valveCheck 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 from base of carburetor body to dimension shownFloat Drop Dimension HP
1 into 38 in(25 to 35 mm) Bend the float lever tab to adjust float drop1234Air vent High speed orifice Inlet valve and gasket Hinge pin, float, and float valve
DRC7957
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 functionTurn carburetor body upside down and hold so gasket surface is horizontalThe weight of the float will close the float valve needleRest Float Gauge, PIN 324891, on gasket surface and slide gauge up, next to floatTop of float should be between notches on gaugeUse notch that is indicated "9.915 HP" Be certain gauge is not holding down the float