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Tohatsu 2-Stroke Outboard Engine 25-70HP Parts

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This page supports Tohatsu 2-Stroke 25–70HP outboard engines. Use it to quickly find compatible parts and service information, including maintenance tips, common replacement items, and troubleshooting guidance. You can also browse the main Tohatsu collection. Scroll to the bottom of this page to start browsing parts for this engine, and on the collection page use the Filter & Sort controls to narrow results by horsepower, year range, and part category.

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How to Identify Your 25–70HP Model

  • Locate the model/serial plate on the transom bracket or swivel bracket. It lists model code, horsepower, and serial number.
  • Model codes may include suffixes for shaft length (S/L/XL), start type (manual/electric), and control type (tiller/remote). Match these when selecting parts.
  • These are carbureted 2‑stroke motors. Some 25–30HP units may be twin or triple cylinder depending on year; 40–70HP models are commonly inline‑3. Verify cylinder count and gearcase style before ordering water pump kits.
  • If equipped with oil injection, note the presence of an oil tank and hoses; premix models will not have an injection reservoir.

Platform Overview

25–30HP Two‑Stroke Midrange

Feature Description
Configuration Carbureted 2‑stroke, twin or triple cylinder depending on year; manual or electric start; tiller or remote control.
Common Models Examples include Tohatsu/Nissan M25, M30 (and NS variants). Exact codes vary by market and year.
Advantages Light weight, quick throttle response, simple carb service.
Notes Fuel pump assemblies may cross over with higher HP models; water pump kits and gearcase seals depend on gearcase style and shaft length.

40–70HP Two‑Stroke Midrange

Feature Description
Configuration Carbureted 2‑stroke inline‑3 with CDI ignition; remote or tiller configurations available by year.
Common Models Examples include M40, M50, M60, M70 series (regional codes vary).
Advantages Strong mid‑range torque, straightforward maintenance, broad parts availability.
Notes Impellers are commonly shared across 40–90HP families; carburetor jetting and link‑and‑sync procedures differ by horsepower—match kits to your exact model code.

Routine Maintenance & Service Parts

Intervals below are general guidelines; always follow the maintenance schedule in your official service manual and adjust for heavy use or harsh conditions.

Item Interval* Remarks Parts Link
Gear oil (lower unit) Every 100 hours or annually Check for water intrusion and metal; replace drain/vent gaskets when servicing. Tohatsu Lower Unit Seal Kits
Spark plugs Inspect every 50 hours; replace ~100 hours Verify heat range and gap; replace if fouled or worn. Spark Plugs
Fuel filter (inline/under‑cowl) Every 100 hours or as needed Replace sooner if contaminated fuel or storage issues are suspected. Fuel Filters
Fuel pump diaphragm/assembly Every 2–3 seasons Hard starting or power loss may indicate a weak diaphragm; use ethanol‑safe components. Fuel Pumps
Water pump impeller or full kit Inspect annually; replace every 1–2 seasons Replace sooner for sandy/silty water or weak telltale stream. Tohatsu Water Pump Repair Kits
Anodes (zincs) Inspect every 50 hours; replace at ~50% loss Choose alloy for your water (salt, brackish, or fresh). Ensure good electrical contact. Anodes
2‑stroke oil supply (premix or oil injection) Verify every trip; service annually Use TC‑W3 oil. For oil‑injected models, inspect reservoir, filters, and hoses; bleed system after service. Hoses

Frequently Used Parts Categories

Common Symptoms & Quick Checks

Symptom Check First Related Parts
Weak telltale stream / overheat alarm Inspect intake screens, impeller condition, and thermostat operation. Water pump impeller/kit, thermostat, intake screens, gaskets.
Poor acceleration / power loss Check fuel quality, squeeze bulb firmness, inline filter restriction, and carburetor cleanliness. Fuel filter, fuel pump, carburetor rebuild kit, spark plugs.
Hard starting / rough idle Verify choke/primer operation, plug condition, and idle mixture/link‑and‑sync settings. Spark plugs, carb gaskets/needles, fuel pump diaphragm, primer/choke components.
Excessive smoke (2‑stroke) Confirm premix ratio or oil injection calibration; look for stuck float/needle flooding. Spark plugs, carburetor parts, thermostats (engine running too cool), oil injection hoses.
Gearcase noise / metal in gear oil Inspect prop for fishing line, check gear oil for water/metal, and test for bearing play. Gearcase seals, bearings, thrust washers, drain/vent plug gaskets.

FAQs

Are parts interchangeable across different years in the 25–70HP range?

Many service items (spark plugs, filters, some fuel pumps, and certain impellers) are shared across models, but carburetor kits, gearcase seals, and ignition components can vary by year, cylinder count, and shaft length. Always confirm by model code and serial number.

When should I replace the impeller?

Inspect the impeller annually and replace every 1–2 seasons, or immediately after any overheat, weak telltale stream, or if the motor was run dry. Sandy or silty water may require more frequent service.

How often should I change lower unit gear oil?

At least every 100 hours or once per year. Change sooner if you see water contamination (milky oil) or metal particles during inspection.

What information is needed to confirm part compatibility?

Provide the full model code, serial number, horsepower, shaft length (S/L/XL), start and control type, and whether the engine is premix or oil‑injected. A photo of the nameplate helps verify details.

Ready to find the right parts? Browse the main Tohatsu collection and filter by horsepower, year, and model for the best match.

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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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