Chrysler 75 and 85 HP Outboards Service Manual OB 3646, Page 43Get this manual
IDLE ADJUSTMENT CAUTION Do not force idle adjustment screw or the tip will be damaged 1Turn idle adjustment screws of all (3) carburetors clockwise until they seat in carburetorFigure 82Open all (3) idle adjustment screws one (1) turn counterclockwise3Shift engine to neutral and start motorAllow engine to warm up to operating temperature4Shift engine into forward gearThrottle engine back to lowest reliable setting 18TH TURN
UNTIL ENGINE POPS1I8TH TURN (WAIT 10 SEC
Figure 9(Finding) Lean Setting
6Turn idle adjustment screw counterclockwise to original position 7Rich SettingTurn idle adjustment screw counterclockwise 18 turn at timewith periods of at least ten (10) seconds between each adjustment until the engine begins to roll or gallop from the rich fuel setting