Tohatsu 2-Stroke 15-50HP Outboard Marine Engine Parts

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For Tohatsu 2-Stroke 15–50HP outboard engines, this page helps you find compatible parts and practical service information. Below you’ll find 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 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 15–50HP Model

Locate the nameplate/serial sticker on the transom bracket or swivel bracket. It lists the model code, serial number, and shaft length.
Decode the suffix: letters typically indicate shaft length (S/L/XL), starting method (manual vs. electric), and control type (tiller vs. remote). The serial range can help pinpoint the year.
Platform cues: 15–30HP models are commonly 2‑cylinder carbureted two‑strokes; 40–50HP models are often 3‑cylinder carbureted two‑strokes.
If your engine has an oil‑injection tank and pump, note those details—some variants are premix while others use oil injection, which affects parts selection and service steps.

Platform Overview

15–30HP Class

Feature	Description
Configuration	Inline‑2, reed‑valve, carbureted 2‑Stroke
Common Models	Typical 15–30HP two‑stroke variants with manual or electric start, tiller or remote control
Advantages	Light weight, simple maintenance, responsive low‑end torque
Notes	Premix or oil‑injection depending on model; cooling and ignition parts may differ by year/serial range

40–50HP Class

Feature	Description
Configuration	Inline‑3, loop‑charged, carbureted 2‑Stroke
Common Models	Typical 40–50HP two‑stroke variants; shared families with closely related Mercury/Nissan co‑developed models in some years
Advantages	Strong mid‑range power, straightforward carb service, durable gearcase
Notes	Impellers/thermostats vary by production year; verify shaft length and gear ratio for propeller selection

Routine Maintenance & Service Parts

Intervals below are general guidelines for two‑stroke outboards. Always follow your specific model’s official service manual.

Item	Interval*	Remarks	Parts Link
Gear oil (lower unit)	Every 100 hours or annually	Change more often if water intrusion or metal found; replace seals if leaking	Tohatsu Lower Unit Seal Kits
Spark plugs	Inspect every 50 hours; replace ~100 hours or as needed	Gap to spec; replace sooner if fouling or misfire	Spark Plugs
Fuel filter / water‑separating filter	100 hours or annually	Replace more often with ethanol fuel or contaminated fuel	Fuel Filters
Fuel line & connectors	Inspect each season	Check for soft spots, leaks, and quick‑connect wear	Fuel Connectors
Water pump impeller / kit	Every 2 seasons or 200 hours	Replace sooner if weak tell‑tale or overheating	Tohatsu Water Pump Repair Kits
Anodes (zinc/aluminum/magnesium)	Inspect often; replace at ~50% wear	Choose alloy for your water (salt, brackish, or fresh)	Anodes
Premix ratio or oil‑injection service	Check each season	Confirm correct premix (commonly 50:1) or bleed/inspect injection pump and lines	Tohatsu Outboard Parts

Frequently Used Parts Categories

Routine Service — Service & Maintenance Kits
Cooling System — Tohatsu Water Pump Repair Kits
Fuel System — Fuel Filters and Fuel Pumps
Ignition / Electrical — Electrical Items
Corrosion Protection — Anodes
Lower Unit & Seals — Tohatsu Lower Unit Seal Kits
Propulsion & Safety — Propellers and Propeller Guards

Common Symptoms & Quick Checks

Symptom	Check First	Related Parts
Weak tell‑tale stream / overheat alarm	Inspect intake screens, water pump impeller, and thermostat	Water pump kit, impeller, thermostat, intake screen
Poor acceleration / power loss	Check spark plug condition, fuel quality, and carburetor cleanliness	Spark plugs, fuel filter, carb repair kit, fuel pump
Hard starting / rough idle	Verify choke/enrichment operation, primer bulb, and compression	Fuel connectors/lines, fuel pump, carb kit, spark plugs
Excessive smoke (2‑Stroke)	Confirm correct premix ratio or oil‑injection calibration; check plugs	Spark plugs, fuel/oil lines, oil‑injection components
Gearcase noise / metal in gear oil	Drain and inspect oil; check for water intrusion and propshaft seal damage	Lower unit seal kit, gear oil, propeller hardware

FAQs

Are parts interchangeable between different years or platforms?

Some items interchange across years, but many cooling, ignition, and gearcase parts differ by production changes and cylinder count (2‑cyl vs. 3‑cyl). Use your exact model code and serial to verify compatibility.

When should I replace the impeller?

As a preventive measure, replace every two seasons or ~200 hours. Replace immediately if the tell‑tale is weak, the engine overheats, or you ran through sand/silt.

How often should the lower unit gear oil be changed?

Typically every 100 hours or annually. If the drained oil looks milky or metallic, service seals and investigate internal wear before further use.

What information helps confirm part compatibility?

Provide the model code, full serial number, horsepower, shaft length (S/L/XL), start/control type, and a clear photo of the nameplate and the part you’re replacing.

Ready to find the right components? Browse the main Tohatsu collection by horsepower, year, and model.

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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.