2008 Mercury 20HP 4S

On Sale
Was $1,799.00

N/A Hours
In Stock
Harris Boat Works
Stock #
20HP 4S
Engine Type
Outboard 4 Stroke
Engine Make
Engine Model
20 ELH
Engine Year


Dealer Insights

Electric Start
Long Shaft - For 20" Transoms
Tiller Handle

Fully Serviced and Ready to Go


Taking the fun with you is a great advantage of inflatable boats and small fishing boats. Mercury offers a complete line of portable FourStroke outboards that are extremely light, with the widest range of models to choose from. The entire line makes operation and portability easy with smart, simple features. Plus, clean, quiet, fuel-efficient FourStroke performance makes them the obvious power of choice. Everything from reliable, instant starts and clean, quiet operation to flawless performance under almost any condition makes Mercury mid-range engines a perfect fit for your boat. No stone was left unturned in our search for excellence, and the resulting engines deliver the reliable, responsive power you need, along with the fuel-efficient performance that has made Mercury FourStrokes the world's best-selling mid-range four-strokes. Delivering peace of mind is a leading priority with Mercury FourStrokes. From the first time you turn the key to your hundredth fishing trip and beyond, you can count on them to perform. The advanced technology, durable components, smart features and unmatched warranty combine to provide the engine security you need today and in the years to come.

  • Overhead cam provides smooth, quiet and efficient operation
  • Unique engine mount system reduces vibration
  • Accelerator pump ensures responsive acceleration
  • Meets all world wide emission requirements
  • Multi-function tiller controls shift, steering, throttle, throttle friction, trim and stop controls
  • Comes standard in 15" and 20" shaft lengths
  • Options include manual trim or power tilt, as well as Manual start and Electric+Manual start
  • BORN TO BE SMOOTH: All portable and mid-range Mercury FourStrokes feature INLINE DESIGNS for inherently smooth operation.
  • EASY SHIFTING: PRECISION ENGINEERED SHIFT system delivers smooth shifting for an improved driving experience.
  • INDUSTRY-LEADING WARRANTY: Every Mercury outboard comes with a three-year limited factory-backed, nondeclining warranty (except Mercury Racing models).
  • SMART ENGINES MEAN MORE FUN: The ECM (Electronic Control Module), with its advanced microprocessor, is the brain of the Mercury FourStroke engine. It controls engine functions such as idle speed, starting and smooth performance and alerts you to potential problems.
  • PEACE OF MIND: Engine Guardian uses more than 40 sensors to monitor functions of your engine. If the proactive operator-warning system detects a potential problem – such as overreving, overheating or low oil pressure – Engine Guardian sends out an alert and automatically reduces engine power to prevent damage.
  • CLEAN POWER: All Mercury FourStrokes are designed to run clean, helping to protect the environment for generations to come. Every Mercury mid-range FourStroke engine carries a CARB THREE-STAR ULTRA-LOW EMISSIONS RATING.
  • HP @ Prop: 20
  • kW @ Prop: 14.9
  • Max RPM (WOT): 5400-6100
  • Cylinders: 2 (in-line)
  • Displacement (CID/cc): 21.4/351
  • Bore & Stroke (in): 2.40 x 2.36
  • Bore & Stroke (mm): 61 x 60
  • Cooling System: Water-cooled w/thermostat
  • Ignition System: CDI w/ electric spark advance
  • Starting: Manual or electric
  • Gear Ratio: 2.15:1
  • Gear Shift: F-N-R (Shift-in-Handle Tiller or Remote Control)
  • Steering: Tiller or remote
  • Alternator Amp: 2 Volt / 11 Amp
  • Alternator Watt: 139
  • Trim Positions: 6
  • Shallow Water Drive: Standard
  • Exhaust System: Through prop
  • Lubrication System: Wet sump
  • Recommended Oil: Mercury 4-Stroke Outboard Oil
  • Oil Capacity: 1.0 L / 1.1 Qt.
  • Fuel Induction System: 2-valve single overhead cam
  • Remote Fuel Tank: Standard
  • Remote Fuel Tank (US Gal): 6.6
  • Remote Fuel Tank (L): 25
  • Shaft Length (inches): 15/20
  • Shaft Length (mm): 381/508
  • Dry Weight (lbs.): 115
  • Dry Weight (kg.): 52
  • Operator Warning System: Low oil pressure / Over--rev
  • Available Propellers: Standard equipment
  • CARB Star Rating: 3
  • Warranty: 3 Year Limited and 3 Year Limited Corrosion



Engine Type
2 Cylinder (in-line)
Bore x Stroke
2.40" x 2.36" (61 x 60 mm)
21.4 cu. in. (351 cc)
CDI w/ electric spark advance, Manual or electric


Shaft Length
15/20 in. (381/508 mm)
115 lbs. (52 kg)


Trim Method
6 Positions
Propshaft Horsepower
20 hp (14.9 kw)
Full Throttle Operating Range
5400 - 6100 RPM
Gear Ratio / Shift
2.15:1, F-N-R (Shift-in-Handle Tiller or Remote Control)
Fuel Induction
2-valve single overhead cam (SOHC)
2 Volt / 11 Amps (139 watts)
Water-cooled w/thermostat
Tiller or remote
3 Year