FourStrokes 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.
20 FourStroke Specifications
| HP/Kw @ Prop | 20 / 14.7 |
|---|---|
| Full throttle RPM | 5400-6100 |
| Cylinder Configuration | 2 (in-line) |
| Displacement (L / CID) | 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 (Electric) |
| Cooling System | Water-cooled with thermostat |
| Starting | Electric Manual |
| Gearcase Ratio | 2.15:1 |
| Gear Shift | F-N-R |
| Steering | Remote Tiller |
| Trim System | Manual Power Tilt |
| Trim Positions | 6 |
| Exhaust System | Though prop |
| Shallow water drive | Yes |
| Shallow water trim range (degrees) | 16 |
| Recommended Oil | Mercury 4-Stroke Outboard Oil |
| Fuel Ethanol Tolerance | 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 / 52.3kg |
