2018 Mercury FourStroke 9.9 HP - 20 in. Shaft

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FourStroke 9.9 HP - 20 in. Shaft



Start Easy

Incredibly responsive to get you going with little or no prep.

  • More Thrust: Mercury® ProKicker outboards feature a deeper gearcase and a four-blade, high-thrust propeller with matching gear ratio – the perfect setup for trolling and precise control in all conditions. The ProKicker gearcase is engineered to be rugged and durable, with robust gears and bearings and a heavy-duty skeg that’s 55% thicker and twice as strong side-to-side as the previous gearcase.
  • Enhanced Features: The Mercury 8 and 9.9hp FourStroke outboards include: New three-position choke and no primer button improve starting, simplify the starting procedure and allow the engine to warm up faster; A richer idle air / fuel mix makes the engine easier to start and provides better idle running quality (tiller handle models); A change to the ignition timing allows fishermen to find and hold optimal troll speed
  • Power Tilt: The fastest power tilt in the industry drops a Mercury 9.9 - 15hp ProKicker FourStroke outboard into the water in just five seconds. Exclusive kicker-centering straps align and secure the outboard in full tilt-up position while you’re underway.
  • Power in the Palm of Your Hand: Tiller models feature the exclusive Mercury multifunction tiller that puts shifting; throttle control (with improved slow-speed throttle advance for optimal trolling); stopping; tilting; steering in the palm of your hand.
  • Lightweight: At only 83 pounds, these engines are very portable and improve the performance of lightweight boats.
  • Convenient and Easy Tilting: Push down on the tiller handle to easily tilt the outboard to any position, made easy with our exclusive ratcheting transom bracket.
  • Start Easily, Idle Smoothly: Mercury 8hp to 20hp FourStroke outboards have features that make starting easier, warm-ups faster and idling smoother! The fuel filter on 8hp to 20hp Mercury FourStrokes has been moved to keep the carburetor cleaner; Tiller handle models have a richer air/fuel mix at idle; They also come standard with a three-position choke, eliminating the need for a primer button
  • 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 in. / 508 mm
  • Gearcase ratio: 2.08:1
  • Dry weight *Lightest model available: 84 lb. / 38 kg
  • CARB star rating: 3
  • Bore and stroke: 2.16 x 1.73 in. / 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: Standard
  • Trim positions: Ratcheting
  • Exhaust system: Through prop
  • Shallow water drive: Yes
  • Shallow water trim range (degrees): 16
  • Remote fuel tank standard (gal / L): 3.2 / 12
  • Color: Phantom Black
Dry weight based on lightest model available.



Engine Type
Inline 2
Bore x Stroke
2.16 x 1.73 in. (55 x 44 mm)
12.8 cid (208 cc)
Electric, Manual


Shaft Length
20 in. (508 mm)
84 lb. (38 kg)


Trim Method
Propshaft Horsepower
9.9 hp (7.3 kW)
Full Throttle Operating Range
5000-6000 rpm
Gear Ratio / Shift
2.08:1 / F-N-R
Fuel Induction
2 valves per cylinder, single overhead cam (SOHC)
6 amp / 76 watt
Water-cooled with thermostat
Remote, Tiller
3 Year Corrosion, 3 Year Limited

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