Description

Read Before You Buy 2016 Mercury 115 HP FourStroke Engine

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2016 Mercury 115 HP FourStroke For Sale

The 2016 Mercury 115 HP FourStroke is a dependable used outboard engine designed for boaters who need a strong balance of power, fuel efficiency, smooth operation, and everyday reliability. Powered by a 2.1-liter inline four-cylinder engine, this Mercury outboard delivers 115 horsepower with electronic fuel injection for responsive acceleration, consistent starting, and efficient fuel delivery.

With approximately 130 operating hours, this engine can be an excellent option for repowering a compatible fishing boat, center console, runabout, pontoon, utility boat, or other mid-size recreational vessel. Its four-stroke design provides smooth power delivery and reduced noise compared with many older two-stroke platforms.

The engine uses a 20-inch shaft, mechanical controls, natural aspiration, and a 35-amp alternator. It also supports Mercury SmartCraft monitoring and power trim and tilt depending on the specific rigging configuration.

Product Overview

The Mercury 115 HP FourStroke is built around a naturally aspirated 2.1-liter inline four-cylinder gasoline engine. Its four-stroke architecture is designed to provide reliable power throughout the operating range while maintaining practical fuel consumption for recreational and fishing applications.

Electronic Fuel Injection helps meter fuel accurately according to operating conditions. This contributes to easier starting, smoother acceleration, and consistent engine response across different speeds.

With a rated speed of approximately 6,000 RPM, the engine is suited to boats that require dependable mid-range horsepower without moving into the weight and fuel requirements associated with larger outboards.

Key Features

• 115 HP Mercury FourStroke outboard
• 2016 model year
• Approximately 130 operating hours
• 2.1-liter displacement
• Inline four-cylinder configuration
• Four-stroke gasoline engine
• Electronic Fuel Injection
• Naturally aspirated
• 6,000 RPM rated speed
• 20-inch shaft
• Mechanical controls
• 35-amp alternator
• SmartCraft-compatible monitoring
• Water-cooled engine
• Power trim and tilt support depending on configuration
• Electric starting
• Smooth acceleration and throttle response
• Suitable for recreational and fishing applications

Technical Specifications

Specification	Details
Brand	Mercury
Model	115 HP FourStroke
Model Year	2016
Condition	Used
Horsepower	115 HP
Rated Output	86 kW / 115 HP
Fuel Type	Gasoline
Displacement	2.1 L
Number of Cylinders	4
Engine Type	Four-Stroke
Aspiration	Naturally Aspirated
Fuel System	Electronic Fuel Injection
Rated Speed	6,000 RPM
Bore x Stroke	80 mm × 90 mm
Shaft Length	20 inches
Weight	399 lbs / 181 kg
Operating Hours	Approximately 130
Alternator	35 amp
Controls	Mechanical
Cooling	Water-Cooled
Starting	Electric Start
Monitoring	SmartCraft Compatible

2.1-Liter Inline Four-Cylinder Engine

At the center of this Mercury 115 is a 2.1-liter inline four-cylinder powerhead. The four-cylinder configuration helps provide smooth and predictable power delivery, making the engine suitable for boats where comfortable cruising and reliable acceleration are important.

The naturally aspirated design keeps the engine architecture relatively straightforward while providing sufficient power for a broad range of mid-size boats.

The 80 mm × 90 mm bore and stroke combination contributes to the engine’s displacement and power characteristics, while the 6,000 RPM rated speed allows the engine to operate effectively across cruising and higher-load conditions.

Electronic Fuel Injection

The Mercury 115 FourStroke uses Electronic Fuel Injection (EFI) to regulate fuel delivery.

EFI provides several advantages over older carbureted systems, including:

• Consistent fuel delivery
• Easier starting
• Improved throttle response
• Better operation across changing conditions
• More precise fuel metering
• Efficient combustion
• Smooth acceleration

For everyday boating, EFI is particularly useful because the engine can adjust fuel delivery according to operating conditions rather than relying on a traditional carburetor system.

Performance and Power Delivery

With 115 horsepower, this Mercury is positioned between smaller recreational outboards and higher-output engines designed for larger offshore vessels.

The engine can provide useful acceleration for boats carrying passengers, fishing equipment, fuel, and other onboard loads. Actual performance will depend on hull design, boat weight, propeller selection, load, water conditions, and engine mounting height.

The 6,000 RPM rated speed also makes correct propeller selection important. A properly matched propeller allows the engine to reach its appropriate operating range without being excessively loaded or over-revved.

20-Inch Shaft Configuration

This particular specification lists a 20-inch shaft.

A 20-inch shaft is commonly used on boats with transoms designed for long-shaft outboard installations. Correct shaft length is important because the engine’s anti-ventilation plate and propeller need to sit at an appropriate position relative to the boat hull.

Before purchasing or installing the engine, compare the existing boat transom height and mounting arrangement with the engine’s shaft length.

Mechanical Controls

The engine is listed with mechanical controls, making it suitable for compatible steering and throttle systems.

Depending on the boat’s existing rigging, the installation may use mechanical throttle and shift controls along with an appropriate steering system.

The exact steering, control cables, gauges, and rigging should be checked before installation, particularly when replacing a different brand or model of outboard.

SmartCraft Compatibility

Mercury SmartCraft compatibility allows the engine to work with compatible digital monitoring equipment.

Depending on the installed system, boaters may be able to monitor information such as:

• Engine RPM
• Engine operating data
• Fuel information
• Engine alerts
• System status
• Other available engine parameters

The exact information available depends on the gauges, instruments, and rigging installed on the boat.

Charging System

The engine is equipped with a 35-amp alternator.

This charging capacity can support the electrical requirements of many recreational boats while also helping maintain the starting battery during normal operation.

Electrical demands vary significantly between boats. Boats using multiple electronics, fish finders, radios, lighting, pumps, livewells, trolling equipment, or other accessories should have their complete electrical system evaluated during installation.

Cooling System

The Mercury 115 uses a water-cooled engine system with thermostat-controlled temperature management.

Proper cooling-system maintenance is essential for any used marine engine. The cooling system should be inspected periodically, particularly if the engine has been operated in saltwater.

Important maintenance areas include:

• Water pump and impeller
• Thermostat
• Cooling passages
• Water intake
• Cooling-system indicators
• Hoses and related components

Regular flushing after saltwater operation can also help reduce salt and mineral buildup.

Fuel Requirements

The engine is designed to operate on unleaded gasoline. The supplied specifications indicate a minimum octane rating of approximately 87 AKI, although fuel requirements should always be confirmed against the engine’s applicable Mercury documentation and the specific operating market.

Avoid contaminated or stale fuel, particularly on a used engine that may not be operated regularly.

Keeping the fuel system clean and using appropriate marine fuel filtration can help maintain reliable operation.

Oil and Routine Maintenance

Regular maintenance is particularly important when purchasing a used outboard.

Typical service areas include:

• Engine oil replacement
• Oil filter replacement
• Gearcase lubricant replacement
• Spark plug inspection or replacement
• Fuel filter inspection
• Water pump and impeller inspection
• Thermostat inspection
• Battery and electrical-system checks
• Fuel-system inspection
• Corrosion inspection
• Cooling-system flushing

Maintenance intervals should be based on Mercury’s recommended service schedule and the engine’s actual operating conditions.

An engine used heavily in saltwater may require additional inspection and corrosion-prevention attention compared with an engine used primarily in freshwater.

Used Engine Condition and 130 Hours

This engine is listed with approximately 130 hours, which is relatively limited operating time for a marine engine of this age.

However, engine hours should not be considered the only indicator of condition.

For a used Mercury 115, buyers should ideally evaluate:

• Cold starting behavior
• Idle quality
• Compression
• Charging-system output
• Cooling-system operation
• Gearcase condition
• Propeller condition
• Oil condition
• Fuel-system condition
• Corrosion
• Service history
• Diagnostic data where available
• Trim and tilt operation
• Steering and control operation

A properly maintained engine with documented service can be more desirable than an engine with fewer hours but poor maintenance history.

Suitable Boat Applications

The 2016 Mercury 115 HP FourStroke can be suitable for a variety of boats, depending on hull specifications and manufacturer-rated horsepower requirements.

Potential applications include:

Fishing Boats

The 115 HP output provides a useful combination of cruising performance and acceleration for many fishing-boat configurations.

Center Consoles

Compatible center-console boats can benefit from the engine’s four-cylinder layout and 115 HP output, particularly where balanced performance and efficient cruising are important.

Pontoons

The engine can be appropriate for compatible pontoon boats where the manufacturer’s maximum horsepower rating allows a 115 HP outboard.

Runabouts

For recreational runabouts, the FourStroke platform offers smooth operation and practical cruising performance.

Utility Boats

Its four-cylinder configuration and 115 HP output can provide useful power for general-purpose marine applications.

Repower Considerations

The Mercury 115 can be considered when replacing an older outboard, provided the boat is rated for the engine’s horsepower, weight, and shaft configuration.

Before repowering, check:

• Maximum rated horsepower
• Maximum permitted engine weight
• Transom height
• Shaft length
• Steering compatibility
• Throttle and shift controls
• Electrical connections
• Battery requirements
• Fuel-system compatibility
• Propeller requirements
• Engine mounting position

A proper repower should consider the complete boat and rigging system rather than horsepower alone.

Propeller Selection

Propeller selection has a major effect on how a 115 HP outboard performs.

The correct propeller depends on:

• Boat weight
• Hull design
• Intended use
• Number of passengers
• Gear carried
• Desired cruising speed
• Engine mounting height
• Required wide-open-throttle RPM

The objective is to select a propeller that allows the engine to operate within its recommended RPM range under normal load.

An incorrectly sized propeller can negatively affect acceleration, fuel consumption, engine load, and overall performance.

Saltwater Use

The Mercury FourStroke platform can be used in marine environments, including saltwater applications, when properly maintained.

Saltwater operation requires additional attention to:

• Freshwater flushing
• Corrosion inspection
• Sacrificial anodes
• Gearcase condition
• Electrical connections
• Cooling passages
• Fasteners and mounting hardware

After saltwater operation, appropriate flushing and routine inspection can help protect the engine’s cooling system and external components.

Installation Considerations

Before installation, verify that the boat and engine are compatible.

Important measurements and specifications include:

• 20-inch shaft configuration
• Transom height
• Engine mounting pattern
• Steering system
• Throttle and shift system
• Battery and electrical connections
• Fuel line and fuel filtration
• Propeller selection
• Engine weight
• Boat horsepower rating

Professional installation is recommended when significant rigging or repowering work is required.

Why Choose to Buy 2016 Mercury 115 HP FourStroke?

The Mercury 115 HP FourStroke offers a practical combination of power, four-stroke efficiency, and proven outboard functionality.

Its main advantages include:

• 115 HP output for a broad range of mid-size boats
• 2.1L four-cylinder architecture for smooth operation
• EFI fuel delivery for consistent starting and throttle response
• Four-stroke design for efficient everyday operation
• 20-inch shaft for compatible long-shaft installations
• 35-amp alternator for onboard electrical needs
• SmartCraft compatibility for engine monitoring
• Mechanical controls for compatible conventional rigging
• Approximately 130 hours listed on this used engine
• Suitable for fishing, recreational, utility, and cruising applications

Frequently Asked Questions

How much horsepower does the 2016 Mercury FourStroke produce?

This engine is rated at 115 horsepower, equivalent to approximately 86 kW.

What is the engine displacement?

The Mercury 115 FourStroke uses a 2.1-liter displacement.

How many cylinders does it have?

It is an inline four-cylinder outboard.

Is the Mercury 115 a four-stroke engine?

Yes. This model is a four-stroke gasoline outboard.

Does it use fuel injection?

Yes. The engine uses Electronic Fuel Injection (EFI).

What shaft length does this engine have?

This listing specifies a 20-inch shaft. Other configurations of the Mercury 115 family may be available with different shaft lengths, so the exact engine configuration should be verified before installation.

How many hours does this used Mercury 115 have?

The engine is listed with approximately 130 operating hours.

What is the engine weight?

The listed dry weight is approximately 399 lbs / 181 kg.

Does it have an alternator?

Yes. The listed alternator output is 35 amps.

Is it compatible with SmartCraft?

Yes. The engine is listed as SmartCraft compatible, allowing compatible digital monitoring equipment to be used.

Does it have power trim and tilt?

Power trim and tilt are supported for appropriate configurations. The exact trim and tilt equipment should be confirmed for the specific engine before purchase.

What boats can use a 115 HP Mercury?

Depending on the boat manufacturer’s horsepower and weight ratings, the engine may be suitable for fishing boats, center consoles, runabouts, pontoons, utility boats, and other mid-size recreational vessels.

What maintenance does a used Mercury 115 require?

Routine service generally includes engine oil and filter changes, gearcase lubricant replacement, spark plug inspection, fuel-system checks, water-pump inspection, cooling-system maintenance, and corrosion inspection.

Is 130 hours considered high for a used outboard?

130 hours is not inherently high, but operating hours should be evaluated together with service history, storage conditions, saltwater exposure, diagnostic information, compression, and overall mechanical condition.

Final Thoughts

The 2016 Mercury 115 HP FourStroke is a versatile used outboard for boat owners looking for dependable 115 HP performance in a relatively straightforward four-cylinder package. Its 2.1-liter engine, EFI fuel system, 20-inch shaft, 35-amp alternator, mechanical controls, and SmartCraft compatibility make it a practical choice for a wide variety of compatible boats.

With approximately 130 hours, this particular engine may be an attractive repower or replacement option, provided its mechanical condition, service history, rigging, and compatibility with the intended boat are properly verified.

For the best installation and performance, match the engine to the boat’s horsepower rating, transom height, shaft requirement, steering system, controls, and propeller requirements before completing the purchase.