2017 Mercury FourStroke 20 HP - 15 in. Shaft

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FourStroke 20 HP - 15 in. Shaft



All-in-one Performance

Intuitive maneuvering for precise control.

  • Electrical support: A high-output alternator keeps batteries charged and fishing electronics humming.
  • 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
  • Great acceleration / more torque: Compact but powerful, Mercury® 15 - 30hp FourStroke outboards feature extra displacement and outstanding low-end torque that put a boat smartly on plane.
  • 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.
  • 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.
  • HP / kW: 20 / 14.7
  • Engine type: Inline 2
  • Displacement (CID/CC): 21.4 / 351
  • Full throttle RPM: 5400-6100
  • Fuel induction system: 2 valves per cylinder, single overhead cam (SOHC)
  • Alternator amp / Watt: 12 amp / 138 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: 15 in. / 381 mm
  • Gearcase ratio: 2.15:1
  • Dry weight *Lightest model available: 115 lb. / 52 kg
  • CARB star rating: 3
  • Bore and stroke: 2.40 x 2.36 in. / 61 x 60 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 system: Power Tilt
  • Trim positions: 6
  • Exhaust system: Through prop
  • Shallow water drive: Yes
  • Shallow water trim range (degrees): 16
  • Remote fuel tank standard (gal / L): 6.6 / 25
  • Color: Phantom Black



Engine Type
Inline 2
Bore x Stroke
2.40 x 2.36 in. (61 x 60 mm)
21.4 cid (351 cc)
Electric, Manual


Shaft Length
15 in. (381 mm)
115 lb. (52 kg)


Trim Method
Power Tilt
Propshaft Horsepower
20 hp (14.7 kW)
Full Throttle Operating Range
5400-6100 rpm
Gear Ratio / Shift
2.15:1 / F-N-R
Fuel Induction
2 valves per cylinder, single overhead cam (SOHC)
12 amp / 138 watt
Water-cooled with thermostat
Remote, Tiller
3 Year Corrosion, 3 Year Limited

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