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Original price was: $5,500.00.$4,500.00Current price is: $4,500.00.
The Mercury 115 HP FourStroke Outboard Motor is a 2.1-liter inline-four outboard built for boat owners who need substantial four-stroke power without moving into a larger V6 platform. The 115 HP engine combines electronic fuel injection, electric starting, power trim and tilt, SmartCraft compatibility and a 5,000–6,000 RPM full-throttle operating range.
For the 115 HP FourStroke configuration, Mercury documents a 2.1-liter inline-four powerhead, 8-valve SOHC architecture, multi-port electronic fuel injection and a 35-amp charging system. The engine is available in 20-inch and 25-inch shaft configurations, while a Command Thrust gearcase is available on applicable 115 HP versions for boats that benefit from a larger propeller.
The Mercury 115 FourStroke uses a 2.1-liter inline-four engine with an 8-valve SOHC cylinder head. Published specifications identify a 90 mm bore and 81 mm stroke, with a 5,000–6,000 RPM full-throttle operating range.
The relatively large displacement for a 115 HP outboard is part of the engine’s design approach: Mercury describes its 75–115 HP FourStroke range as using high-displacement powerheads and lightweight designs to deliver strong torque and acceleration.
The 115 HP FourStroke uses computer-controlled multi-port electronic fuel injection (EFI). EFI provides electronically managed fuel delivery across the engine’s operating range and supports consistent starting, throttle response and operation.
The documented air-induction system uses a performance-tuned scroll intake manifold. This intake design is part of the 115 HP FourStroke’s overall airflow and combustion system.
| Specification | Mercury 115 HP FourStroke |
|---|---|
| Manufacturer | Mercury Marine |
| Rated power | 115 HP / approximately 86 kW |
| Engine type | 4-stroke inline-four |
| Valve configuration | 8-valve SOHC |
| Displacement | 2.1 L / approximately 2,061 cc |
| Bore × stroke | 90 × 81 mm |
| Full-throttle operating range | 5,000–6,000 RPM |
| Fuel system | Computer-controlled multi-port electronic fuel injection |
| Air induction | Performance-tuned scroll intake manifold |
| Starting | Electric Smart Start |
| Alternator | 35 A / 441 W |
| Cooling | Water-cooled with thermostat |
| Gear shift | Forward-Neutral-Reverse |
| Primary gear ratio | 2.07:1 |
| Steering | Remote; configuration-dependent tiller options available |
| Trim system | Power trim and power tilt |
| Shaft lengths | 20 in. / 508 mm and 25 in. / 635 mm |
| Dry weight | Approximately 359 lb / 163 kg for the lightest standard model |
| Oil capacity | Approximately 5.5 qt / 5.2 L |
| Exhaust | Through propeller |
The Mercury 115 FourStroke is offered in 20-inch and 25-inch shaft configurations. The correct shaft length depends on the boat’s transom height and the specific engine configuration.
Before ordering a 115 HP outboard, measure the transom and confirm the shaft specification. Correct mounting height helps maintain proper propeller depth and can affect acceleration, handling, ventilation and overall performance.
The standard Mercury 115 FourStroke uses a 2.07:1 primary gear ratio. Mercury also offers a Command Thrust gearcase on applicable 90 and 115 HP models. The Command Thrust design is intended to turn larger-diameter propellers and can be useful for heavier boats that need stronger low-speed thrust and easier planing.
Command Thrust should not be assumed simply because an engine is rated at 115 HP. Confirm the exact model designation and gearcase before choosing a propeller or planning a repower.
The Mercury 115 HP FourStroke is available with power trim and power tilt. Trim adjustment allows the operator to change the engine’s running angle according to boat speed, load and water conditions, while tilt provides additional clearance when the engine is raised.
Proper trim can improve the boat’s running attitude, but the engine should be operated within Mercury’s recommended trim range. Avoid excessive positive trim, especially during acceleration or rough-water operation.
Published specifications identify a 35-amp / 441-watt alternator with a water-cooled voltage regulator. Mercury also identifies the 115 FourStroke as compatible with SmartCraft digital technology.
SmartCraft compatibility can allow appropriate connected marine instrumentation and engine information systems to monitor operating information. Actual available functions depend on the rigging, instruments and model configuration.
The 115 HP FourStroke uses SmartCraft Engine Guardian as its engine-protection and operator-warning system.
Electronic protection systems are designed to provide warnings or protective responses when certain engine conditions require attention. They do not replace normal pre-launch inspections, maintenance or safe operating practices.
Published Mercury specifications for this 115 HP FourStroke identify unleaded regular gasoline with a minimum 87 octane rating (R+M/2), or 90 RON, with a maximum ethanol content of 10 percent. Mercury FourStroke 10W-30 oil is listed as the recommended engine oil.
Fuel and lubricant requirements can vary by market and model configuration. Always use the owner’s manual for the exact engine when servicing a particular 115 HP motor.
The Mercury 115 FourStroke uses a water-cooled system with thermostat and a through-propeller exhaust arrangement.
Cooling-water flow should be checked whenever the engine is operated. If cooling-water flow appears abnormal, stop the engine and investigate the cause rather than continuing to run the motor without adequate cooling.
A 115 HP FourStroke is suited to compatible fishing boats, aluminum boats, runabouts, deck boats, open-bow boats, inflatables and other recreational craft designed for this horsepower class. Mercury specifically identifies applications including deck, inshore fishing, bass, aluminum tiller, runabout, rigid-hull inflatable and fish-and-ski boats.
The correct application depends on the boat manufacturer’s maximum horsepower rating, transom capacity, engine weight limits and recommended shaft length. A 115 HP engine should not be installed on a boat that is not rated to accept its power and weight.
When replacing an older outboard with a Mercury 115 HP FourStroke, check the entire rigging system rather than evaluating the engine in isolation. Verify transom height, mounting-hole arrangement, steering system, throttle and shift controls, battery capacity, fuel supply, propeller clearance and engine weight.
The lightest published standard configuration is approximately 359 lb / 163 kg. The actual installed weight can be higher once the propeller, controls, steering components and other rigging are included.
For heavier boats, confirm whether the specific 115 HP configuration uses a standard or Command Thrust gearcase. The gearcase selection can affect propeller choice and low-speed thrust characteristics.
Routine maintenance should include engine-oil and filter service, gearcase lubricant inspection, spark-plug checks, cooling-system inspection, propeller inspection, fuel-system checks and examination of anodes and mounting hardware.
If purchasing a used Mercury 115 HP outboard, review its service history and serial number before installation. A professional inspection can also evaluate compression, diagnostic data, lower-unit condition, corrosion and the condition of the steering and trim systems.
The Mercury FourStroke is rated at 115 HP, with published specifications listing approximately 86 kW.
The 115 HP FourStroke uses a 2.1-liter inline-four powerhead, with published specifications identifying approximately 2,061 cc displacement.
Yes. The engine uses computer-controlled multi-port electronic fuel injection (EFI).
The published full-throttle operating range is 5,000–6,000 RPM.
The lightest standard configuration is approximately 359 lb / 163 kg. Exact weight varies with shaft length, gearcase and equipment.
The 115 HP FourStroke is available in 20-inch and 25-inch shaft configurations in the documented model range.
Yes. Published specifications identify power trim and power tilt for the 115 HP FourStroke.
Yes. Mercury identifies Command Thrust as an available gearcase for applicable 90 and 115 HP FourStroke outboards. It is designed to turn larger propellers and provide increased low-speed thrust for suitable boats.
The Mercury 115 HP FourStroke Outboard Motor combines 115 HP, a 2.1-liter inline-four engine, EFI, electric starting, power trim and tilt, SmartCraft compatibility and a 35-amp charging system. It is a practical high-output four-stroke option for boats designed around the 115 HP class.
Before purchasing, confirm the exact model configuration, shaft length, gearcase, boat horsepower rating, transom height, engine weight and rigging requirements. Browse our outboard engines category to compare additional marine propulsion options.
