1987-1993 Mercury Mariner Outboards 70/75/80/90/100/115HP 3 and 4-cylinder Factory Service Manual, Page 104Get this manual
Carburetor Adjustments INITIAL STARTING ADJUSTMENT
CARBURETOR FLOAT ADJUSTMENT
After service or replacement of carburetor, turn low speed mixture screw adjustment in (CLOCKWISE) until it seats LIGHTLY then back off (each carburetor) the number of turns per model as indicated, following: 70 H.P- 1-14 75 H.P- 1-12 80 H.P- 1-12 90 H.P- 1-12 100 H.P- 1-34 115 H.P- 1-12
1If installed, remove carburetor as outlined in "Carburetor Removal", following2Remove fuel bowl and gasket and check float level as shown3If necessary, adjust float level by bending metal tab on float to which inlet needle is clipped11.1 mm (716 in
This adjustment will permit engine startupLOW SPEED MIXTURE ADJUSTMENT