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.
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.
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.
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||20 / 14.7|
|Full throttle RPM||5250-6250|
|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|
|Alternator Amp||12 amp / 138 watt|
|Cooling System||Water-cooled with thermostat|
|Trim System||Power Tilt|
|Trim Positions||6 position with shallow water drive|
|Exhaust System||Through 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
|Shaft Length||15 in (381mm)
20 in (508 mm)
|Dry Weight * Lightest model available||115lbs / 52kg|
|CARB Star Rating||3|
FourStroke 20 HP Engine Tests
FourStroke 20 HP Resources
You can order all available Mercury literature online or through any authorized Mercury dealer. Please have your outboard or sterndrive serial number before placing the order.
- Operation, Maintenance and Warranty Manuals
- Parts Manual
- Service Manual
Request printed brochures by mail or download as an electronic PDF.Request a Brochure
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