25 HP 4-Stroke Midrange Outboard

Model MFS25

With Tohatsu's reputation for powerful speed and unmatched reliability, the Tohatsu 25 hp 4-stroke will keep boaters loyal. Redesigned for 2015, the upper and lower motor cover features a more modern look, and easier access to regular maintenance items.

The all new multi-function tiller handle comes standard on all 25hp models with electric start. This tiller includes all controls conveniently located on the handle for easy access giving you more control, better maneuverability and increased safety.

With all of the features you need to make the most of your motor on the water, this engine gives what it promises: powerful performance and exceptional fuel economy. This 25 hp 4-stroke has become another top seller.

Tohatsu 4-Stroke Benefits:

  • All new sleek design
  • Designed with proven technology
  • Advanced cross-flow induction for smooth operation
  • Canister style oil filter for easy replacement
  • Larger capacity oil reservoir for optimum lubrication
  • Tuned intake system for crisp takeoffs
  • Ultra Low emission, EPA and CARB approved
  • 5 Year limited warranty

High Performance and Easy Operation:

  • Lower gear ratio from 1.92:1 to 2.17:1 gives you better low end torque and the ability to turn a higher pitch prop for better top end performance
  • Electronic fuel injection
  • The boating industry's first battery-free, manual start EFI 4-stroke
  • Digital CD ignition system for quicker starts
  • Large alternator and rectifier for superior battery charging
  • Adjustable steering friction and trim tab for reducing steering effort
  • Front mounted shift lever for easier operation
  • Shallow water drive, 6 tilt positions*
  • Power trim and tilt*
  • Remote control**

Fundamentals for User Convenience and Reliability:

  • Redesigned upper and lower motor cover for a more modern look and easier access to regular maintenance items
  • Built in fresh water flush system on lower motor cover for easy access
  • Through-the-prop exhaust for a quieter ride
  • Thermostatically controlled cooling system for consistent engine temperature
  • Stainless steel water pump housing liner for outstanding durability
  • High grade marine aluminum alloy that provides the ultimate protection against corrosion
  • Zinc coating on internal water passages for superior corrosion resistance
  • 6.6 gallon (25 liter) fuel tank including fuel fittings and fuel line
  • Aluminum propeller

Warning & Protection:

  • Low oil pressure warning (audible)
  • Overheat warning (audible)
  • Safety lanyard (an essential protection feature standard on all Tohatsu outboards)
  • Start-in-gear protection for safer engine starting
  • Over-rev. limiter

* Certain models

** Remote control models



Engine Control Unit

Multi-Function Tiller Handle

Available on select 25hp models. This handle features an ergonomically designed shift lever for easy and convenient shifting as well as a longer throttle grip with 110 degrees rotation for easier maneuverability. All controls on the multi-function tiller are conveniently located on the handle for easy access and control. The gear shift, throttle control, trim switch, safety lanyard cord and electric start key switch are all integrated in the handle.


Engine Control Unit

Engine Control Unit (ECU)

The 16 bit ECU precisely controls the fuel injection and ignition timing for 4-stroke engines.


Three step trolling speed control

Battery-Less Electronic Fuel Injection

The 30hp and 25hp now have the industry's first battery-less electronically controlled fuel injection that provides quick throttle response, excellent fuel economy, and very smooth rides on the water.


Three step trolling speed control

Tuned Intake Manifold

The tuned intake manifold provides increased low & mid speed torque and quieter operation.


Three step trolling speed control

Tubular Air-Intake

The tubular structure of the air-intake, originally developed by Tohatsu, helps to take in necessary airflow to the engine while preventing water from entering into the motor cover.


Three step trolling speed control


Standard built-in freshwater flushing system simplifies routine engine flushing.


Engine (No. of Cylinder) 3
Output 25 hp (18.4 kw)
Displacement 526 cc (32.09 cu.in.)
Bore x Stroke 61 x 60 mm (2.4 x 2.36 in)
Starting Electric or Manual
Control Type Remote Control or Tiller Handle
Gear Shift Forward - Neutral - Reverse
Gear Ratio 1.92:1
Propeller Selection Range 8" - 14"
Transom Height 15", 20"
Fuel Unleaded Gasoline (87 Octane)
Oil Type NMMA Certified FC-W® 4-stroke oil** SAE 10W-30/40 (SF, SG, SH, SJ)
Oil Capacity 2 qt. (1800 mL)
Fuel Tank 6.6 US Gal. (25 Lit) Separate Fuel Tank
Weight* 157 lbs. (71.5 kg)
Alternator Output 12V, 180W, 15A
Max. RPM Range 5,000 - 6,000
Electric Fuel Injection S
Digital CD Ignition System S
Start In Gear Protection S
Thermostat Controlled Cooling System S
Through-The-Prop Exhaust S
Shallow Water Drive O
Oil Pressure Warning S
Power Trim and Tilt O


  • S: Standard Features
  • O: Optional on Certain Models
  • * Weight specification is based on the lightest version.

    ** FC-W® is a registered trademark of the National Marine Manufacturers Assoc. (NMMA)

    Specifications and descriptions are subject to change without notice.



    Parts Book Type Brand Model Book Year Book #
    Download 4-Stroke Nissan NSF25A 2002 002N21050-1
    Download 4-Stroke Tohatsu MFS25A 2002 002-21050-1
    Download 4-Stroke Tohatsu MFS25B 2005 002-21050-2
    Download 4-Stroke Tohatsu MFS25B 2010 002-21050-4
    Download 4-Stroke Tohatsu MFS25B 2011 002-21050-5
    Download 4-Stroke Tohatsu MFS25B 2012 002-21050-6
    Download 4-Stroke Tohatsu MFS25B 2013 002-21050-7
    Download 4-Stroke Tohatsu MFS25B 2014 002-21050-8
    Download 4-Stroke Tohatsu MFS25C 2015 002-21050-0AD

    Request Quote


    Prop Type Load* Diameter Pitch Blades Standard Equip. Part # Comments
    aluminum  NA 14.3 21 3   9999RUBE321M  RUBEX / HUB KIT REQUIRED
    aluminum  NA 14.5 19 3   9999RUBE319M  RUBEX / HUB KIT REQUIRED
    aluminum  NA 14.8 17 3   9999RUBE317M  RUBEX / HUB KIT REQUIRED
    aluminum  NA 15 15 3   9999RUBE315M  RUBEX / HUB KIT REQUIRED
    aluminum  NA 15.5 12 3   PTRVT3R12P  
    aluminum  NA 15.5 11 3   PTRVT3R11P  
    stainless steel  NA 15.25 23 3   PTOFS3R23P  
    stainless steel  NA 15.25 23 3   PTOFS3L23P left hand for counter-rotating gear case
    stainless steel  NA 15.25 21 3   PTOFS3R21P  
    stainless steel  NA 14.25 21 3   PTPTZ3R21P  
    stainless steel  NA 14.25 21 3   PTPTZ3L21P left hand for counter-rotating gear case
    stainless steel  NA 15.25 21 3   PTOFS3L21P left hand for counter-rotating gear case
    stainless steel  NA 15.25 19 3   PTOFS3L19P left hand for counter-rotating gear case
    stainless steel  NA 15.25 19 3   PTOFS3R19P  
    stainless steel  NA 14.25 19 3   PTPTZ3L19P left hand for counter-rotating gear case
    stainless steel  NA 14.25 19 3   PTPTZ3R19P  
    stainless steel  NA 14.25 17 3   PTPTZ3R17P  
    stainless steel  NA 15.25 17 3   PTOFS3R17P  
    stainless steel  NA 15.25 15 3   PTOFS3R15P  
    stainless steel  NA 14.25 15 3   PTPTZ3R15P  

    Repair Kits/Electrics

    Part Number Description
    3R0-87322-0 Water Pump Repair Kit (MFS25/30)
    3R0-76300-1 Electric Starter Kit (MFS25/30A)
    3R0-87322-0 Water Pump Repair Kit (MFS25/30)
    3R0-76300-1 Electric Starter Kit (MFS25/30A)
    3R3-87122-1* Carburetor Repair Kit (MFS25/30A) - 3 Carburetor Repair Kits (3R3-87122-1) are required; one kit for each of the 3 carburetors.

    Fuel Tanks + More

    Part Number Description
    3H670-2002M Fuel line hose (primer bulb assembly & fuel connectors)
    3FF70-2004M Fuel line hose (no connectors/fittings; fits all models)
    394-70260-0 8mm (5/16") fuel connector (engine male)
    3GR70-2500M 8mm (5/16") fuel connector (engine female)
    9999800MA2 1/4" NPT (thread) fuel connector (tank male). Can be used on permanent tanks or fuel/water separators with 1/4" NPT (thread).
    3B2-70281-0 8mm (5/16") fuel connector (tank female). Works with 9999800MA2 fuel connector.
    99999-37851 Tohatsu Water/Fuel Separator Kit (includes one filter)
    99999-37801 Replacement 10 micron filter (for Tohatsu Water/Fuel Separator)
    99999-UF10K UNIKAS UF-10K Water/Fuel Separator Kit (includes one filter)
    99999-UF10RF Replacement 10 micron filter for Unikas UF-10K (includes replace o-ring)