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Tohatsu 2-Stroke 115-140HP Outboard Engine Parts

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This page is dedicated to Tohatsu 2-Stroke 115-140HP outboard engines. Use it to find compatible parts and service information, including maintenance tips, common replacement parts, and troubleshooting guidance. You can also browse the main Tohatsu collection for a wider selection. Scroll to the bottom of the page to start browsing parts for this engine. On the collection page, use the Filter & Sort controls to narrow results by horsepower, year range, and part category/section.

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How to Identify Your 115-140HP Model

  • Locate the nameplate/serial plate on the starboard side of the transom bracket or the swivel bracket. Record the full model code and serial number.
  • Model codes may include series letters and shaft length (e.g., "L" for long shaft). Examples you may see on these 2-strokes include M115A/M120A/M140A (carb) and MD115A/NSD115A (TLDI).
  • Carbureted vs. TLDI: Carb models have carburetors and a conventional fuel pump; TLDI models have an oil tank, vapor/fuel separator, injectors, and a fuel rail—use this to select the correct fuel and electrical parts.
  • For oil‑injected 2-strokes, note the presence of a remote or under-cowl oil tank and the routing of oil lines; this helps confirm parts for hoses and sensors.

Platform Overview

Carbureted Inline‑4 2‑Stroke (115/120/140 A‑series)

Feature Description
Configuration Inline‑4, carbureted 2‑Stroke with oil injection on most models
Common Models M115A, M120A, M140A (various shaft lengths and control options)
Advantages Lightweight package with strong holeshot and simple mechanical service
Notes Shares many gearcase, cooling, and ignition components across the range; fuel pump and carb parts are carb‑platform specific

TLDI Direct‑Injection 2‑Stroke (115/120/140)

Feature Description
Configuration Inline‑4, low‑pressure direct‑injected 2‑Stroke (TLDI) with oil injection
Common Models MD115A, NSD115A and related TLDI 120/140 variants
Advantages Improved fuel economy and emissions compared to carb versions; strong mid‑range torque
Notes TLDI fuel/air components (vapor separator, injectors, sensors, harness) are platform‑specific; cooling and many gearcase parts remain similar

Routine Maintenance & Service Parts

Intervals below are general guidelines for 2‑stroke outboards in this class. Always follow the official Tohatsu service manual for your exact model and usage.

Item Interval* Remarks Parts Link
Gear oil (lower unit) Every 100 hours or annually Change and inspect for water or metal; reseal if contamination is found Tohatsu Lower Unit Seal Kits
Spark plugs Every 100 hours or annually Use correct heat range; re‑gap or replace if fouled Spark Plugs
Fuel filter (in‑line or under‑cowl) Inspect every 50 hours; replace at 100 hours TLDI models also have fine filters in the vapor separator Fuel Filters
Water pump impeller/kit Every 200 hours or 2 seasons Replace sooner if weak tell‑tale or overheat alarm occurs Tohatsu Water Pump Repair Kits
Anodes (internal & external) Inspect every 50 hours; replace when 50% depleted Use correct alloy for your water (salt/brackish/fresh) Anodes
Oil‑injection tank, lines, and pump (2‑Stroke) Seasonally Check for clean oil, leaks, and perform pump bleed/prime after service Hoses
Fuel pump diaphragm (carb models) Inspect at 200 hours; replace if soft or cracked Common cause of bogging or surging on carb platforms Fuel Pumps
Thermostat Inspect annually; replace as needed Stuck thermostats can cause rich running or overheat Tohatsu Outboard Parts
Propeller and hardware Check each trip Inspect blades, hub, and cotter; keep a spare prop and hardware on board Propellers

Frequently Used Parts Categories

Common Symptoms & Quick Checks

Symptom Check First Related Parts
Weak tell‑tale or overheat alarm Inspect intake screen, tell‑tale hose, and water pump; test thermostat Water pump kit, thermostat, grommets/hoses, anodes
Poor acceleration or power loss Check prop damage or hub slip, spark plugs, fuel quality, and filters Propeller, spark plugs, fuel filter, carb kit or fuel pump (carb), VST/filters (TLDI)
Hard starting or rough idle Prime bulb and check for air leaks; verify plug condition; for TLDI, inspect vapor separator and injector health Fuel hoses/clamps, fuel filter, spark plugs, injector service (TLDI)
Excessive smoke (2‑Stroke) Confirm fresh fuel and correct oil; check oil pump calibration and thermostat operation Spark plugs, oil lines, thermostat
Gearcase noise or metal in oil Verify oil level/condition; look for water intrusion; pressure test and reseal Lower unit seal kit, prop shaft seals, bearings

FAQs

Are parts interchangeable between carb and TLDI models?

Many hardware and cooling/gearcase parts interchange, but fuel and electrical components differ significantly. Always confirm by full model code and serial number before ordering.

When should I replace the impeller?

As a rule of thumb, replace the impeller every 200 hours or every two seasons—sooner if the tell‑tale weakens, you run in silt/sand, or the engine overheats.

How often should I change the lower unit gear oil?

Change at least annually or every 100 hours. Inspect the drained oil for water (milky color) or metal. If contamination is present, pressure test and reseal the gearcase.

What information helps confirm part compatibility?

The complete model code, serial number, shaft length, and whether the engine is carbureted or TLDI direct‑injected. Photos of the nameplate and the part needing replacement are also helpful.

Ready to find parts for your Tohatsu 2‑Stroke 115-140HP? Browse the main Tohatsu collection by horsepower, year, and model to locate compatible components.

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If you’re unsure about your model, send us a photo of the nameplate and the part you need and we’ll help verify compatibility.
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