20 HP

Performance and Power in one convenient package.

Taking the fun with you is one of the great advantages of owning an inflatable boat or small fishing boat. Mercury offers a complete line of extremely light portable FourStroke outboards, with the widest range of models to choose from. So wherever you and your boat go, your Mercury portable FourStroke can also go. 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.

 

Key 20hp Features

Large Displacement Design

At 21.4 cubic inches, this engine delivers the strong low-end torque needed to get the hull up on plane, with quicker throttle response and acceleration.

Fingertip Control

Mercury Fourstrokes are designed with a boat load of user-friendly features, such as our multifunction tiller handle. This tiller handle gives you easy one-handed operation of shifting, stopping, throttle, throttle friction, and tilt. More control equals better maneuverability.

Wishbone Mounts

Mercury’s “wishbone” style motor mount system cradles the powerhead and absorbs the torsional rotation of the crankshaft. By isolating and reducing the vibration transmission to your boat, it provides a smooth driving experience.

Long-Lasting Gearcase

Mercury’s 20hp FourStrokes have dual water pickups. So even if you end up in the shallows, your engine will keep its cool and not overheat.

HP/Kw @ Prop 20 / 14.7
Full throttle RPM 5250-6250
Cylinder Configuration 2 (in-line)
Displacement (CID / CC) 21.4 / 351
Bore and Stroke (in / mm) 2.40 x 2.36in
61 x 60mm
Fuel Induction System 2 valves per cylinder, single overhead cam (SOHC)
Ignition CDI w/electronic spark advance
Fuel System Carbureted
Alternator Amp 12 amp / 138 watt
Cooling System Water-cooled with thermostat
Starting Electric
Manual
Gearcase Ratio 2.15:1
Gear Shift F-N-R
Steering Remote
Tiller
Trim System Power Tilt
Trim Positions 6 position with shallow water drive
Exhaust System Though prop
Shallow water drive Yes
Shallow water trim range (degrees) 16
Recommended Oil Mercury 4-Stroke Outboard Oil
Recommended Fuel 87 octane/up to 10% ethanol
Remote fuel tank standard (gal / L) 6.6 / 25
Engine Protection Operator Warning System Low oil pressure
Over-rev
Shaft Length 15 in (381mm)
20 in (508 mm)
Dry Weight * Lightest model available 115lbs / 52kg
CARB Star Rating 3