General Specifications
HP / kW
9.9 HP / 7.4 kW
Displacement
209 cc (12.8 cu in.)
Cylinders
2 (Inline)
WOT RPM
5000 - 6000
Weight
38.5 kg / 85 lbs
Drive & Lower Unit
Gear Ratio
2.08:1
Shaft Length
15, 20
Electrical System
Alternator Output 145 Watts
Starting System Electric/Manual
Technical Maintenance Toolkit
Verified service specifications for the Mercury 9.9hp FourStroke EFI (2024)
Lubrication
Engine Oil
Mercury FourStroke Oil 10W-30
Oil Capacity 1 Liters
Gearcase Lube 290 ml
Ignition System
Spark Plug
NGK DCPR6E
Gap Setting 0.035"
Firing Order 1-2-3-4
Performance Specs
Idle RPM 700 ± 50
WOT Range 5000-6000
Alternator 145W
Standard Maintenance Intervals
20H Break-in Service
100H Annual Tune-up
300H Water Pump & Seals
Identification
The serial number for the Mercury 9.9hp FourStroke EFI is typically found on a plate located on the transom bracket.
Technical Toolkit
Maintenance Compatibility
These models share common service parts with the Mercury 9.9hp FourStroke EFI:
Category Discovery
Reference Data
Information compiled from Mercury Marine factory service manuals and original sales literature published in 2024.