2018 Mercury 20MLH 20HP 4-Stroke Outboard Motor

The 2018 Mercury 20MLH 20HP Outboard Motor is engineered to deliver reliable power, quick acceleration, and smooth operation for boaters who demand performance and durability. Designed with Mercury’s proven marine engineering, this compact yet powerful outboard is an excellent choice for small fishing boats, aluminum boats, tenders, and inflatable vessels.

At the heart of this engine is a large-displacement 351cc powerhead, providing strong low-end torque that allows your boat to plane quickly and maintain consistent speed even with heavier loads. The tuned intake system and advanced ignition technology further enhance throttle response and overall performance.

Weighing only 118 lbs, the Mercury 20MLH is easy to mount, handle, and transport while still delivering dependable power on the water. The heavy-duty transom bracket, vibration-absorbing mounts, and “wishbone” mounting system reduce engine vibration, resulting in smoother and quieter operation.

Built with high-grade marine alloy construction, stainless steel components, and zinc-coated water passages, this engine is designed to withstand harsh marine environments. It is fully saltwater-rated and protected with sacrificial zinc anodes and corrosion-resistant materials to ensure long-term durability.

The multi-function tiller handle integrates throttle control, steering, and gear shifting for convenient one-handed operation. Additional features such as adjustable steering tension, start-in-gear protection, over-rev protection, and low oil pressure warning provide added safety and reliability.

Whether you’re heading out for fishing, coastal cruising, or transporting gear across the water, the Mercury 20MLH 20HP Outboard Motor offers a perfect balance of power, efficiency, and durability.

Key Features

• Large Displacement Powerhead (351cc) for strong torque

• Fast throttle response and quick acceleration

• Digital CDI ignition with electronic spark advance

• Tuned intake system for improved performance

• High-grade marine alloy construction for durability

• Stainless steel water pump housing

• Zinc-coated water passages for corrosion protection

• Saltwater-rated design with sacrificial zinc anodes

• Integrated tiller handle with Forward-Neutral-Reverse shifting

• Adjustable steering tension control

• Twist-grip throttle with adjustable tension

• Thermostat-controlled water cooling system

• Heavy-duty transom mounting bracket

• Manual tilt system

• Quiet through-propeller hub exhaust

• Vibration-reducing “wishbone” mount system

• Start-in-gear protection safety feature

• Low oil pressure warning indicator

• ESG over-rev protection system

• Safety lanyard emergency stop switch

• Easy maintenance oil filter system

Motor Specifications

Model: 20MLH
Model Year: 2018
Manufacturer: Mercury Marine
Country of Manufacture: Japan

Horsepower: 20 HP
Engine Type: 4-Stroke
Cylinders: 2

Shaft Length: 20″ Long
Steering: Tiller
Starting System: Manual
Trim & Tilt: Manual

Fuel Delivery: Carburetor
Fuel Tank: External

Displacement: 351 cc (21.4 cu in)
Bore x Stroke: 2.40 × 2.36 in

Full Throttle RPM Range: 5400 – 6100 RPM
Ignition System: CDI with electronic spark advance

Fuel Type: 87 octane (up to 10% ethanol)
Fuel Tank Capacity: 6.6 gallons

Cooling System: Water-cooled with thermostat
Saltwater Rated: Yes

Gear Ratio: 2.15:1
Gear Shift: Forward – Neutral – Reverse

Propeller: 3-Blade Aluminum (9.2″ Diameter × 9.1″ Pitch)

Weight: 118 lbs

Oil Type: Mercury 4-Stroke Outboard Oil
Oil Capacity: 1 Quart (1000 ml)

Alternator: Optional 12 Amp / 138 Watt

What’s Included in the Box

• 6.6 Gallon External Fuel Tank

• Quick-Connect Fuel Line

• Aluminum Propeller

• Mercury 4-Stroke Engine Oil

• Owner’s Manual

• Tool Kit

• Mercury Marine 3-Year Warranty