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Mercury 20 HP Fourstroke

Mercury 20 HP – With models ranging from 30hp to 2.5hp, the Mercury FourStroke Portable are suited to everything from small inflatables to aluminium dinghies and punts. Mercury's FourStroke Portables are designed with leading edge features for enhanced reliability and performance. Like trouble-free starting thanks to a fast idle and fuel primer system. So every engine in the range runs smoother for longer. We've even added noise-reducing cowls, air intake silencers and through prop exhausts for even cleaner and quieter operation.

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″ / 381 mm
  • 20″ / 508 mm
Gearcase ratio
  • 2.15:1
Dry weight *Lightest model available
  • 115 lbs / 52 kg
CARB star rating
  • 3
Emissions Star Rating
  • 3
Bore and stroke
  • 2.40 x 2.36″ / 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