Mercury 20 HP Electric Start, Remote Steering, Trim & Tilt, Long Shaft Outboard Motor

The Mercury FourStroke 20 ELPT EFI is a 4-stroke outboard marine engine designed for small fiberglass, aluminum, or inflatable boats requiring a long shaft, measuring 2.5–5 meters, with a 20 HP / 14.7 kW and 333 cc 2-cylinder engine. The FourStroke 20 ELPT EFI, with its 333 cc EFI FourStroke engine, offers economical and reliable power to small and medium-sized boat users.

FourStroke 20 ELPT EFI Series Features and Technology Advantages

The 2-cylinder design provides balanced power with a compact and lightweight design. EFI injection ensures reliable starting without the need for a manual fuel system.

• 2-Cylinder Engine (333 cc): 2-cylinder design provides balanced power with a compact and lightweight design
• Long Shaft (508 mm (20")): Propeller operates at optimum depth with the correct transom height
• EFI Electronic Injection: No primer pump required — fuel system automatically fills before turning the key
• Electric Start: Instant engagement with key or button — comfortable and quick starting
• Manual Trim: Adjust stern angle manually — simple and reliable mechanical structure
• 12-Liter Internal Tank: Ready for daily short-distance use; external fuel tank input available

Long Shaft — What Boat Type Is It Suitable For?

The long shaft (508 mm (20")) is suitable for the vast majority of inflatable boat, aluminum, and fiberglass boat models. For boats with a transom height of 381 mm, a short shaft model should be preferred.

Technical Specifications

Who Is This Engine For?

• 2.5–5 meter small and medium-sized boats: economical EFI power
• Fishing and coastal use: quiet 4-stroke operation
• Inflatable boats and RIBs: lightweight engine and balanced thrust
• Auxiliary engine: access to reliable Mercury service network

Maintenance and Longevity

4-stroke Mercury engines operate trouble-free for many years with regular oil changes and end-of-season maintenance protocols. The impeller of the water-cooled system should be checked every 100 hours or every two seasons. In saltwater use, freshwater flushing is mandatory after every use.

Related maintenance categories: Maintenance Kit | Engine Oil | Impeller | Mercury Spare Parts

Frequently Asked Questions

What boat size does the Mercury FourStroke 20 HP engine fit?

20 HP power can fit different sizes depending on boat weight and type. General rule: 15–20 kg boat weight per HP. Always check the maximum engine power recommended by the boat manufacturer.

What advantage does the EFI system provide over a carbureted engine?

EFI (Electronic Fuel Injection) does not require a primer pump or choke adjustment. It provides reliable starting in cold weather and at high altitudes, consistent power output, and lower fuel consumption compared to carbureted alternatives.

What are the Mercury FourStroke maintenance periods?

Oil change at the first 20 hours, then every 100 hours or once a season. Impeller check every two seasons. In saltwater use, freshwater flushing is mandatory after every use. End-of-season fuel system protection is recommended.

Which boat and inflatable boat brands are compatible with the FourStroke 20 ELPT EFI?

Mercury outboard motors are compatible with many fiberglass, aluminum, and inflatable boat models thanks to their universal stern clamp or transom mounting system. The only criteria are your boat's 508 mm (20") transom height and the maximum engine power approved by the manufacturer. You can get compatibility confirmation from Clever Marin by sharing your boat model.

Related Products and Categories

• Mercury Outboard Motors
• Mercury Marine Products
• Mercury Spare Parts
• Mercury 2.5–30 HP FourStroke
• Mercury 40–60 HP FourStroke
• Outboard Motors
• Boat Engines
• Maintenance Kit
• Impeller
• Anode

Is This the Right Configuration for Your Boat?

Share your boat model, transom height, and intended use — let's verify together if the Mercury FourStroke 20 ELPT EFI engine is suitable for your boat and ensure the correct shaft selection.