2003 Johnson ST 6/8 HP 4 Stroke Outboards Service Manual, PN 5005471, Page 106Get this manual
FUEL SYSTEM
CARBURETOR
Install the idle mixture needle and spring using Idle Adjustment Tool, PIN 910245Turn needle carefully until it lightly contacts the seat; then back it off four turnsApply RTV silicone rubber adhesive sealant to screw after adjustmentInstall the hinge pin, float, and float valve
Air vent High speed orifice Inlet valve and gasket Hinge pin, float, and float valve
Accelerator pump rod retainer Accelerator pump rod end cap Idle adjustment screw and spring Carburetor body cover Idle mixture needle and spring Inlet valve and gasket
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 float gaugeUse notch that is indicated "9.915 HP Be certain gauge is not holding down the float