90 HP 2-Stroke TLDI Outboard

TLDI Model MD90

The Tohatsu 90hp TLDI® outboard is one of the premier members of our new generation of direct injection outboards. We developed our TLDI® line of outboards to provide consumers with the best possible choice for environmentally conscious yet powerful outboards. We have all of that and more in the 90 hp TLDI®.

The 90 hp TLDI® provides significant increases in fuel and oil economy while also providing a decrease in hydrocarbon emissions through the exhaust. This in turn gives you a clean, quiet, boat ride at a lessened operating cost. The Tohatsu 90hp TLDI® gives every boater a truly reliable outboard while providing advanced technology!

Tohatsu 90 hp TLDI® Benefits:

  • Air assisted direct fuel injection system that provides excellent fuel economy
  • Extremely quiet operation
  • Excellent horsepower-to-weight ratio
  • Comes standard with a convenient built-in freshwater flush system that simplifies routine engine flushing
  • Lightweight and compact
  • Ultra-low emission, EPA and CARB approved
  • 5 Year limited warranty

High Performance and Easy Operation:

  • Inductive ignition system for reliable starting
  • Outstanding acceleration
  • Electronic oil pump for more precise oil regulation throughout the rpm range
  • Oil reservoir located on the top of the motor for quicker and easier refill onboard
  • Multi-point oil injection system to more completely lubricate vital engine components
  • Power Trim & Tilt
  • Remote control box**

Fundamentals for User Convenience and Reliability:

  • Through-the-prop exhaust for a quieter ride
  • Thermostatically controlled cooling system for consistent engine temperature
  • Stainless steel water pump housing 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
  • User adjustable idle and trolling speeds
  • Tachometer and Trim & Tilt Gauge**
  • Aluminum propeller

Warning & Protection:

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


The TLDI® series are Tohatsu's award winning outboard motors that have an established reputation for being compact in size while demonstrating highly desired features such as low emissions and high fuel economy that are demanded by the new generation of boaters.

They are powered by a direct fuel injection system and a 32 bit ECU (Engine Control Unit). The ECU gives precise fuel injection instructions in accordance to the operating conditions detected by the multiple sensors located on the motor. The TLDI® outboard motors meets all of the emission regulations stipulated by EPA (Environmental Protection Agency) and CARB (California Air Resources Board).


Three step trolling speed control 3-Step Trolling Speed Control - The idling speed can be set to any of the three rpm ranges, 700, 800 or 900, by adjusting it on your key switch. This feature allows you to select the ideal trolling speed for maneuvering during a variety of current and wind conditions.  


Engine Control Unit Engine Control Unit (ECU)
The 32 bit engine control unit controls the fuel injection and ignition timing for TLDI® outboards.


Flushing System Fresh Water Flushing Port The 90 hp TLDI® comes standard with a convenient built-in freshwater flush system.  Located on the side of the engine, the flushing port simplifies routine engine flushing.  


Air compressor Air Compressor
One of TLDI®'s essential engine components that is the driving force in achieving stabilized fuel injection.


Direct fuel injection into cylinders Direct fuel Injection into Cylinders - Due to the intrinsic design of the chamber on the cylinder head, the finely atomized fuel mist created by the fuel injector is injected near the spark plug to achieve ideal combustion.  


Multifunctional tachometer Multifunctional Tachometer - The tachometer informs the operator of potential problems through the meter indicator and warning lamp. (Remote models only.)


Pistons Pistons Dedicated to TLDI® Outboards - Teflon coated pistons (equipped on MD 75/90/115) with a concave shape to the head were specifically designed for TLDI® and significantly increase the fuel combustion efficiency.  


Engine (No. of Cylinder) 3
Output 90hp (66.2 kw)
Displacement 1267 cc (77.3 cu.in)
Bore x Stroke 86 x 72.7 mm (3.39 x 2.86 in)
Starting Electric
Control Type Remote Control
Gear Shift Forward - Neutral - Reverse
Gear Ratio 2.33:1
Propeller Selection Range 11" - 21"
Transom Height 20", 25"
Fuel Unleaded Gasoline (87 Octane)
Oil Type Premium TCW-3 or Recommended
Fuel Tank Optional
Weight* 337 lbs (153 kg)
Alternator Output 12V, 490W, 40A
Max. RPM Range 5,150 - 5,850
Direct Fuel Injection S
Inductive Ignition System S
Start In Gear Protection S
Thermostat Controlled Cooling System S
Through-The-Prop Exhaust S
Power Trim and Tilt S
Variable Idle Speed 700, 800, 900 rpm


  • S: Standard Features
  • O: Optional on Certain Models
  • * Weight specification is based on the lightest version. Specifications and descriptions are subject to change without notice.



    Parts Book Type Brand Model Book Year Book #
    Download TLDI Tohatsu NSD90A 2001 002N21049-0
    Download TLDI Tohatsu NSD90B 2003 002N21049-2
    Download TLDI Tohatsu NSD90B (AQ) 2006 002N21049-3
    Download TLDI Tohatsu MD90B 2003 002-21049-2
    Download TLDI Tohatsu MD90B (AQ) 2006 002-21049-3
    Download TLDI Tohatsu MD90B 2010 002-21049-5
    Download TLDI Tohatsu MD90C2 2010 002-21049-6
    Download TLDI Tohatsu MD90C2 2012 002-21049-7
    Download TLDI Tohatsu MD90C2 2013 002-21049-8
    Download TLDI Tohatsu MD90C2 2014 002-21049-9
    Download TLDI Tohatsu MD90C2 2015 002-21049-0AE

    Request Quote


    Prop Type Load* Diameter Pitch Blades Standard Equip. Part # Comments
    aluminum light 13.2 21 3   9999RUBA321M Rubex/hub kit required
    aluminum light 12.75 21 3   3N4W645451  
    aluminum light 13.2 19 3   9999RUBA319M Rubex/hub kit required
    aluminum light 13 19 3   3N4W645411  
    aluminum light 13.25 17 3   9999RUBA317M Rubex/hub kit required
    aluminum moderate 13.25 16 3   3N4B645341  
    aluminum moderate 13.5 15 3   9999RUBA315M Rubex/hub kit required
    aluminum heavy 13.75 13 3   9999RUBA313M Rubex/hub kit required
    aluminum heavy 14 11 3   9999RUBA311M Rubex/hub kit required
    aluminum heavy 14 11 3   3N4B645231  
    aluminum heavy 14 9 3   9999RUBA309M Rubex/hub kit required
    stainless steel  NA 13.25 19 3   PT70115P19  
    stainless steel  NA 13.25 18 3   NM889610180  
    stainless steel  NA 13.25 17 3   PT70115P17  
    stainless steel  NA 13.25 15 3   PT70115P15  
    stainless steel  NA 13.25 14 3   PT70115P14  

    Repair Kits/Electrics

    Part Number Description
    3C7-87322-1 Water Pump Repair Kit (MD70/75/90/115)

    Fuel Tanks + More

    Part Number Description
    3B770-2004M Fuel line hose (primer bulb assembly & fuel connectors) - will not fit TLDI 75/90C2
    3FF70-2004M Fuel line hose (no connectors/fittings; fits all models)
    3B2-70260-1 8mm (5/16") fuel connector (engine male) - not needed for not needed for TLDI 75/90C2
    3B270-2501M 8mm (5/16") fuel connector (engine female) - not needed for not needed for TLDI 75/90C2
    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)