Fast throttle response and fast acceleration are features designed into the 20 HP EFI Mercury Outboard. With powerful low end torque and a large displacement your boat planes faster and you get to your destination across the water faster thanks to Mercury engineering. At 103 lbs. the Mercury 20 HP EFI model 20MH is your affordable choice in the 20 HP line up with a manual start and the 15 inch short shaft. The 20MH also includes manual tilt, a heavy duty transom bracket, vibration absorbing mounts and Mercury’s multi function tiller. Mercury outboards come with a 3-year factory warranty that starts on day of purchase.
Additional information
| Horsepower | 20 HP |
|---|---|
| Shaft Length | 15″ (Short) |
| Starter Type | Manual |
| Tilt & Trim | Manual |
FEATURES
- Large Displacement Powerhead (351cc)
- Thru-Cowl Backup Manual Start
- Digital CD Ignition with Spark Advance
- Tuned Intake for Quick Acceleration
- High Grade Marine Alloy Construction
- Stainless Steel Water Pump Housing
- Zinc Coated Water Passages
- Rated for Saltwater Use
- Sacrificial Zinc Anodes and Trim Tab
- Tiller Integrated F-N-R Gear Shifting
- Adjustable Steering Tension Control
- Twist-Grip Throttle with Tension Control
- Thermostat Controlled Water Cooling
- Heavy Duty Transom Mounting Bracket
- Quiet Through-Propeller-Hub Exhaust
- “Wishbone” Mount for Reduced Vibration
- 3.2 Gallon Fuel Tank and Fuel Line
- Easy Maintenance Canister Oil Filter
- Start-In-Gear Protection
- Low Oil Pressure Warning Indicator
- ESG Over-Rev Protection
- Safety Lanyard Stop Switch
- Owner’s Manual
- Mercury Marine 3-Year Warranty
SPECS
| MODEL | 20HP EFI 20MH |
|---|---|
| MODEL YEAR | 2021 |
| SKU | 20MH-21EFI |
| WEIGHT | 103.0 lb |
| MANUFACTURER | Mercury |
| COUNTRY OF MANUFACTURE | Japan |
| HORSEPOWER | 20hp |
| SHAFT LENGTH | 15″ (Short) |
| STEERING | Tiller |
| STARTING | Manual |
| TRIM & TILT | Manual |
| FUEL DELIVERY | EFI |
| FUEL TANK | External |
| CYLINDER(S) | 2 |
| DISPLACEMENT | 333 cc (20.3 cubic inches) |
| BORE AND STROKE | 61 mm x 57 mm (2.402 in. x 2.244 in.) |
| FULL THROTTLE RPM RANGE | 5400-6100 |
| IGNITION SYSTEM | CDI w/electronic spark advance |
| INDUCTION SCAVENGING | SOHC |
| VALVES PER CYLINDER | 2 |
| FUEL TYPE | 87 octane/up to 10% ethanol |
| FUEL TANK / FUEL LINE | 3.2 Gallon/12 Liter |
| OIL TYPE | Mercury 4-Stroke Outboard Oil |
| OIL CAPACITY | 1 Quart (1000 ml) |
| LUBRICATION | Trochoid Pump |
| ALTERNATOR | Optional 12 amp / 138 watt (Electric) |
| COOLING SYSTEM | Water-cooled with thermostat |
| SALTWATER RATED | Yes |
| GEAR RATIO | 2.15 |
| GEAR SHIFT | Forward-Neutral-Reverse |
| PROPELLER | 9.2″ Diameter X 9.1″ Pitch 3-Blade Aluminum |
IN THE BOX
- Fuel Tank (3.2 gallon)
- Quick Connect Fuel Line
- Mercury 3-Year Warranty
- Aluminum Propeller
- Mercury 4-Stroke Oil
- Owner’s Manual & Tool Kit

Yamaha Outboards 6HP F6LMHA
Honda 9.9HP Portable Outboard | BF10DK3SHS
2021 HONDA 2.3 HP BF2.3DHSCH Outboard Motor
Mercury Verado 350HP CXXL Outboard White
Honda 15HP Portable Outboard | BF15D3LH
Yamaha Outboards 150HP V MAX SHO VF150XA
Mercury 4HP 4MLH Outboard
2021 Mercury 4 HP MLH Outboard Motor
Achilles LSI-E Series Inflatable Boat | White LSI-290E 2022
Yamaha 150HP | F150XB |Scratch & Dent Level 1 | 4959
2022 Suzuki DF150AP X 150 HP Outboard Motor
2021 HONDA 15 HP BF15D3SHS Outboard Motor
Mercury 9.9HP 9.9MH Outboard
Yamaha F60LB Outboard | 60HP Scratch and Dent Level 1 | 4785
Mercury 4HP 4MH Outboard
2021 HONDA 5 HP BF5DHSHNA Outboard Motor
2021 HONDA 9.9 HP BFP10D3XHT Power Thrust Outboard Motor
2022 Suzuki DF300AP L 300 HP Outboard Motor
Achilles LT Series Inflatable Boat | LT-2 2022
2021 HONDA 9.9 HP BFP10D3XHS Power Thrust Outboard Motor
SALE - Achilles LEX Series Inflatable Boat | LEX-96 2021
Mercury 3.5HP 3.5MH Outboard
2022 Suzuki DF115B X 115 HP Outboard Motor
2022 Suzuki DF150A X 150 HP Outboard Motor
2022 Suzuki DF350A X 350 HP Outboard Motor
Honda 15HP Portable Outboard | BF15D3SH
Mercury 5HP 5MLH LPG Propane Outboard
Yamaha 115HP Jet | F115JB
2022 Suzuki DF200A L 200 HP Outboard Motor
Mercury 5HP 5MLHA Sail Power Outboard
2021 HONDA 20 HP BF20D3SH Outboard Motor
Yamaha 200HP DEC | F200LCA
Mercury 6HP 6MH Outboard
Yamaha Outboards 9.9HP High Thrust T9.9LPHB
Mercury 9.9HP 9.9EL Command Thrust Outboard
Yamaha 175HP DEC | F175XCA
2021 HONDA 9.9 HP BFP10D3XH Power Thrust Outboard Motor 