Equipped with a larger gear case for more thrust, the Mercury 9.9hp Command Thrust FourStroke delivers big-time power and control that wider, heavier boats demand. The Command Thrust gear case allows a wider selection of propellers to get the performance just right. So, if you're powering a barge, pontoon or heavier displacement hull, the 9.9hp is the perfect partner. Exclusive to Mercury and designed for easy control, the Multi-function tiller handle makes boating easy allowing gear shift, throttle, steer, tilt and stop the engine with just one hand. All recreational Mercury outboard models from the 2.5 - 350hp range now come with 3+3= 6 years of warranty coverage. World class engines, world class support, that's what you get when you buy a Mercury.

HP / kW
  • 9.9 / 7.3
Engine type
  • Inline 2
Displacement (CID/CC)
  • 12.8 / 208
Full throttle RPM
  • 5000-6000
Fuel induction system
  • 2 valves per cylinder, single overhead cam (SOHC)
Alternator amp / Watt
  • 6 amp / 76 watt
Recommended fuel
  • 87% octane / up to 10% ethanol
Recommended oil
  • Mercury FourStroke Oil 10W-30
Engine protection operator warning system
  • Low oil pressure
  • Over-rev
Starting
  • Electric
  • Manual
Steering
  • Remote
  • Tiller
Shaft length
  • 20" / 508 mm
  • 25" / 635 mm
Gearcase ratio
  • 2.42:1
Dry weight *Lightest model available
  • 96 lbs / 44 kg
CARB star rating
  • 3
Emissions Star Rating
  • 3
Bore and stroke
  • 2.16 x 1.73" / 55 x 44 mm
Ignition
  • CDI w/electronic spark advance
Fuel system
  • Carbureted
Cooling system
  • Water-cooled with thermostat
Gear shift
  • F-N-R
Gearcase options
  • Command Thrust
Trim system
  • Power Tilt
Trim positions
  • Ratcheting
Exhaust system
  • Through prop
Shallow water drive
  • Yes
Shallow water trim range (degrees)
  • 16
Integrated fuel tank (gal / L)
  • 3.2 / 12
Remote fuel tank standard (gal / L)
  • 3.2 / 12
Color
  • Phantom Black

 

Horse Power (hp)
  • 9.9