Mercury 40 HP Rope & Electric Start Trim Tilt Long Shaft Outboard Motor

The Mercury FourStroke 40 ELH PT 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 40 HP / 30 kW and 747 cc 3-cylinder engine. The FourStroke 40 ELH PT EFI, with its 747 cc EFI FourStroke engine, offers economical and reliable power to small and medium-sized boat users.

FourStroke 40 ELH PT EFI Series Features and Technology Advantages

The 3-cylinder design offers balanced power with a compact and lightweight design. EFI injection ensures reliable starting without the need for a manual fuel system.

• 3-Cylinder Engine (747 cc): The 3-cylinder design offers balanced power with a compact and lightweight design
• Long Shaft (508 mm (20")): The propeller operates at optimal depth with the correct transom height
• EFI Electronic Injection: No primer pump required — automatic fuel system filling before turning the key
• Electric Start: Instant engagement with a key or button — comfortable and quick starting
• Electric Trim and Tilt (Power Trim & Tilt): Adjust trim angle during navigation with a button — fuel efficiency optimization; full engine lift with tilt
• 25 Liter Internal Tank: Sufficient capacity for medium-distance routes; option for external tank connection

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: economic EFI power
• Fishing and coastal use: quiet 4-stroke operation
• Inflatable boats and RIBs: lightweight engine and balanced thrust
• Auxiliary 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 does the Mercury FourStroke 40 HP engine fit?

40 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 high altitudes, consistent power output, and lower fuel consumption compared to carbureted alternatives.

What are the maintenance intervals for Mercury FourStroke?

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

Which boat and brand models are compatible with the FourStroke 40 ELH PT EFI?

Mercury outboard motors 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 transom height of 508 mm (20") 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 It the Right Configuration for Your Boat?

Share your boat model, transom height, and intended use — let's verify the suitability of the Mercury FourStroke 40 ELH PT EFI engine for your boat and the correct shaft selection together.