Mercury 100 HP Electric Start Steering Trim Tilt Long Shaft Outboard Motor

The Mercury FourStroke 100 ELPT EFI is a 4-stroke outboard marine engine designed for medium-sized fiberglass, aluminum, or inflatable boats requiring a long shaft, suitable for boats 4–7 meters in length, with 100 HP / 74 kW and a 2064 cc 4-cylinder engine. The FourStroke 100 ELPT EFI with its 2064 cc 4-cylinder EFI FourStroke engine offers efficient and reliable power to medium-sized boat users. Located within Mercury's most popular power range, this model stands out with its extensive service network and long-life advantage.

FourStroke 100 ELPT EFI Series Features and Technology Advantages

The 4-cylinder structure provides balanced vibration and strong torque, ensuring stable cruising for medium-sized boats. EFI electronic injection ensures reliable starting in all weather conditions and optimized fuel consumption.

• 4-Cylinder Engine (2064 cc): The 4-cylinder structure provides balanced vibration and strong torque, ensuring stable cruising for medium-sized boats
• Long Shaft (508 mm (20")): The propeller operates at optimum depth for the correct transom height
• EFI Electronic Injection: Easier cold starting and lower fuel consumption compared to carbureted alternatives
• Electric Start: Instant activation with a key or button — comfortable and fast starting
• Power Trim & Tilt: Adjust trim angle with a button during cruising — fuel efficiency optimization; tilt the engine fully up with tilt
• External Floating Fuel System: Connection for a large capacity external tank — range determined by user needs

Long Shaft — What Type of Boat Is It Suitable For?

The long shaft (508 mm (20")) is suitable for the majority of inflatable, 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?

• 4–7 meter medium-sized boat primary engine: 4-cylinder balanced power and quiet operation
• Fishing and coastal cruising: Comfort for long routes with EFI economy
• Family boat and weekly use: Reliable and low-maintenance power source
• Rental boat applications: Extensive Mercury service network and spare part access

Maintenance and Longevity

4-stroke Mercury engines operate smoothly 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 100 HP engine suitable for?

100 HP power can suit 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 and 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 oil change every 100 hours or once a season. Impeller check every two seasons. In saltwater use, freshwater flushing is mandatory after each use. End-of-season fuel system protection is recommended.

Which boat and brand models are compatible with the FourStroke 100 ELPT 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 508 mm (20") transom height and the maximum engine power approved by the manufacturer. You can share your boat model to get compatibility confirmation from Clever Marin.

Related Products and Categories

• Mercury Outboard Motors
• Mercury Marine Products
• Mercury Spare Parts
• Mercury 40–60 HP FourStroke
• Mercury 75–150 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 confirm together the suitability of the Mercury FourStroke 100 ELPT EFI engine for your boat and the correct shaft selection.