Description
Mercury 9.9HP 4-Stroke EFI Outboard (2016 model) is a compact, fuel-efficient portable marine engine designed for small fishing boats, inflatables, dinghies, sailboat auxiliaries, and lightweight utility vessels. It is part of Mercury’s well-known FourStroke portable series, built for reliability, quiet operation, easy starting, and low maintenance.
This engine is especially popular among boaters who need a lightweight motor that is easy to carry, install, and operate while still delivering consistent power for trolling, cruising, and short-distance travel.
Key Features
9.9 Horsepower Four-Stroke Engine
EFI (Electronic Fuel Injection) System on select models
Battery-less EFI starting system (on some variants)
Compact and portable lightweight design
Tiller handle steering control system
Electric start or manual start options
Long shaft (20”) and short shaft (15”) versions
Forward, Neutral, Reverse gear system
Quiet and smooth operation
Excellent fuel efficiency
Low emissions EPA-compliant design
Water-cooled thermostat system
Through-prop exhaust system
CDI digital ignition system
External portable fuel tank system
Strong low-end torque for small boats
Saltwater corrosion protection
Simple maintenance design
Integrated carrying handle
Shallow water drive capability
Reliable cold starting performance
Overheat protection system
Low oil pressure warning system
Vibration-reduction engine mounts
Easy throttle response control
Technical Specifications (Typical 2016 Mercury 9.9HP)
- Engine Type: 2-cylinder / 4-stroke
- Horsepower: 9.9 HP
- Displacement: ~209cc–247cc (varies by variant)
- Fuel System: EFI or carburetor (model dependent)
- Starting System: Manual or Electric Start
- Steering: Tiller handle
- Cooling System: Water-cooled
- Gear Shift: F-N-R (Forward, Neutral, Reverse)
- Gear Ratio: ~2.08:1
- Full Throttle Range: ~5000–6000 RPM
- Fuel Type: Unleaded gasoline
- Oil Type: 4-stroke marine engine oil
- Dry Weight: ~80–100 lbs depending on version
- Shaft Length: 15” or 20”
- Fuel Tank: External portable tank (typically 3–6 gallons)
