Mercury 115 HP Electric Start, Steering, Trim and Tilt CT Extra Long Shaft Outboard Motor

The Mercury FourStroke 115 EXLPT EFI CT is a 4-stroke outboard marine engine designed for medium-sized fiberglass, aluminum, or inflatable boats requiring an extra-long shaft, such as 4–7 meter vessels, with a 115 HP / 86 kW and 2064 cc 4-cylinder engine. Thanks to its Command Thrust (CT) gearcase system, it features a larger gearcase and lower unit from a higher-horsepower engine block. The FourStroke 115 EXLPT EFI CT, with its 2064 cc 4-cylinder EFI FourStroke engine, offers efficient and reliable power to medium-sized boat users. This model, which falls within Mercury's most popular power range, stands out with its extensive service network and long-life advantage.

FourStroke 115 EXLPT EFI CT Series Features and Technology Advantages

The 4-cylinder configuration provides balanced vibration and strong torque, ensuring stable cruising on 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 configuration provides balanced vibration and strong torque, ensuring stable cruising on medium-sized boats
• Extra-Long Shaft (572 mm (22.5")): The propeller operates at optimum depth at the correct transom height
• EFI Electronic Injection: Easy cold starting and lower fuel consumption compared to carbureted alternatives
• Command Thrust (CT) Gearcase: A larger gearcase and lower unit from a higher-horsepower engine block — high torque at low RPMs and strong thrust capability
• Electric Start: Instant engagement with a key or button — comfortable and fast starting
• Electric Trim and Tilt (Power Trim & Tilt): Adjust trim angle with a button while cruising — fuel efficiency optimization; fully raise the engine with tilt
• External Floating Fuel System: Connection for a large-capacity external tank — range determined by user needs

Extra-Long Shaft — Which Boat Type Is It Suitable For?

The extra-long shaft (572 mm (22.5")) allows the propeller to operate at the correct water depth on large fiberglass and aluminum boats with high freeboards. It is 64 mm longer than the standard long shaft (508 mm).

Technical Specifications

Who Is This Engine For?

• Primary engine for 4–7 meter medium-sized boats: 4-cylinder balanced power and quiet operation
• Fishing and coastal cruising: EFI economy for comfortable long journeys
• Family boat and weekly use: reliable and low-maintenance power source
• Rental boat applications: extensive Mercury service network and spare parts accessibility

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. Freshwater rinsing is mandatory after every use in saltwater.

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

Frequently Asked Questions

What boat size is the Mercury FourStroke 115 HP engine suitable for?

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

What advantages does the EFI system offer compared to 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 maintenance intervals for the Mercury FourStroke?

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

Which boat and inflatable boat brands are compatible with the FourStroke 115 EXLPT EFI CT?

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 572 mm (22.5") transom height and the maximum engine power approved by the manufacturer. You can confirm compatibility with Clever Marin by sharing your boat model.

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 It the Right Configuration for Your Boat?

Share your boat model, transom height, and intended use — let's verify together if the Mercury FourStroke 115 EXLPT EFI CT engine is suitable for your boat and the correct shaft choice.