Mercury 50 HP Long Shaft Outboard Motor with Electric Start, Steering, Trim and Tilt

The Mercury FourStroke 50 ELPT EFI is a 4-stroke outboard marine engine designed for small fiberglass, aluminum, or inflatable boats requiring a long shaft, with a length of 2.5–5 meters, boasting 50 HP / 37 kW and a 995 cc 4-cylinder engine. The FourStroke 50 ELPT EFI, with its 995 cc EFI FourStroke engine, offers economical and reliable power to small and medium-sized boat users.

FourStroke 50 ELPT EFI Series Features and Technology Advantages

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

• 4-Cylinder Engine (995 cc): 2-cylinder structure offers balanced power with a compact and lightweight design
• Long Shaft (508 mm (20")): Propeller operates at optimum depth with correct transom height
• EFI Electronic Injection: No primer pump needed — automatic fuel system filling before turning the key
• Electric Start: Instant activation with key or button — comfortable and quick starting
• Electric Power Trim & Tilt: Adjust trim angle with a button while cruising — optimizes fuel efficiency; fully raise engine with tilt
• 25 Liter Internal Tank: Sufficient capacity for medium-distance routes; option for external tank connection

Long Shaft — Which Boat Type Is It Suitable For?

A 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: economic EFI power
• Fishing and coastal use: quiet 4-stroke operation
• Inflatable boats and RIBs: lightweight engine and balanced thrust
• Backup engine: reliable Mercury service network access

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 each use.

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

Frequently Asked Questions

What boat size is the Mercury FourStroke 50 HP engine suitable for?

50 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 offer 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 intervals?

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

Which boat brands are compatible with the FourStroke 50 ELPT EFI?

Mercury outboard engines are compatible with many fiberglass, aluminum, and inflatable boat models thanks to their universal transom 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 Engines
• Mercury Marine Products
• Mercury Spare Parts
• Mercury 2.5–30 HP FourStroke
• Mercury 40–60 HP FourStroke
• Outboard Engines
• 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 confirm together the suitability of the Mercury FourStroke 50 ELPT EFI engine for your boat and the correct shaft selection.