1987-1993 Mercury Mariner Outboards 70/75/80/90/100/115HP 3 and 4-cylinder Factory Service Manual, Page 101Get this manual

Fuel System (Carburetor) Specifications
Float Setting 716 in ("0.015 in Float Weight grams ("0.4 grams) Idle Adjustment Screw 1-12 turns ("14) (Set Halfway Between Lean and Rich) 16 18 13

20 14 15 23

IMPORTANT: DO NOT touch this adjustmentThis is preset by the manufacturer, and is NOT for field serviceConventional carbcleaners will not affect the sealant securing this adjustment

• ATV
• Jet Ski
• Outboard Motors
• Personal Watercraft
• Snowmobiles
• Stern Drives