Tohatsu 2-6 HP 2-Stroke & 4-Stroke Outboard Engine Parts

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This page is for Tohatsu 2–6 HP 2‑Stroke & 4‑Stroke outboard engines. Use it to find compatible parts and practical service information, including maintenance tips, frequently replaced 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. 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 2–6 HP Model

Nameplate location: Look on the transom/clamp bracket (often port side) or swivel bracket for the model and serial plate.
Reading the code: Examples like MFS6, MFS5, MFS4 (4‑Stroke) or M5/M3.5 (2‑Stroke). Suffixes typically indicate shaft length (S=15 in, L=20 in) and options such as electric start (E) or tiller vs. remote.
2‑Stroke vs 4‑Stroke: 4‑Stroke models have an oil fill cap and dipstick on the powerhead; 2‑Stroke models use premix or an oil injection tank and do not have an engine oil dipstick.
Shared platforms: Many 4/5/6 HP 4‑Stroke models share core components; verify exact model and serial to confirm parts compatibility.

Platform Overview

Small 2‑Stroke (2–6 HP)

Feature	Description
Configuration	Carbureted 2‑Stroke, manual start, tiller control; lightweight package for dinghies and small inflatables.
Common Models	Examples: M2/M3.5/M5/M6 series (varies by year and market).
Advantages	Very light, simple to service, strong hole‑shot for size.
Notes	Use the correct fuel‑oil ratio specified for your model; many wear items (impellers, plugs, anodes) are serviceable with basic tools.

Small 4‑Stroke (2–6 HP)

Feature	Description
Configuration	Carbureted 4‑Stroke, single‑cylinder, manual start; popular for portability and fuel efficiency.
Common Models	Examples: MFS2.5/MFS3.5/MFS4/MFS5/MFS6 with S or L shaft options.
Advantages	Quiet operation, low fuel use, broad parts commonality among 4/5/6 HP variants.
Notes	Many routine service parts (impeller kits, spark plugs, anodes) overlap across the 4/5/6 HP family; confirm by model and serial.

Routine Maintenance & Service Parts

Intervals below are general guidelines; always follow the procedures and schedules in your official service manual for your exact model and operating conditions.

Item	Interval*	Remarks	Parts Link
Engine oil + filter (4‑Stroke)	First 20 hours, then every 100 hours or annually	Warm engine before draining; replace crush washer if applicable.	Oil Filters
Gear oil (lower unit)	Every 100 hours or annually	Check for water contamination (milky oil) and metal on drain plug; replace seals if leaking.	Tohatsu Outboard Parts
Spark plugs	Inspect every 50 hours; replace every 100 hours or annually	Verify heat range/gap per manual; replace if fouled or worn.	Spark Plug
Inline/fuel filter	Inspect every 50 hours; replace annually or if restricted	Replace sooner if using ethanol‑blended fuel or in dusty environments.	Fuel Filters
Water pump impeller/kit	Every 2–3 seasons, or at the first sign of weak telltale	Replace impeller, wear plate, and key; inspect housing and gaskets.	Tohatsu Water Pump Repair Kits
Anodes (zinc/aluminum/magnesium)	Inspect every 50 hours; replace when 50% consumed	Choose anode material for your water type (salt/brackish/fresh).	Anodes
2‑Stroke oil supply / premix	Check before each outing	Use the specified TC‑W3 marine oil and correct mix ratio or verify oil injection tank level and lines.	Tohatsu Outboard Parts
Propeller hardware (shear pin/cotter, thrust washer)	Inspect every 50 hours or after impact	Carry spares; a damaged pin or cotter can strand the boat.	Propellers

Frequently Used Parts Categories

Routine Service — Tohatsu Outboard Parts
Cooling System — Tohatsu Water Pump Repair Kits
Gearcase Seals — Tohatsu Lower Unit Seal Kits
Fuel System — Fuel Filters
Ignition / Electrical — Electrical Items
Propellers & Hardware — Propellers
Corrosion Protection — Anodes

Common Symptoms & Quick Checks

Symptom	Check First	Related Parts
Weak telltale or overheat alarm	Inspect intake screens for blockage, verify thermostat operation, and check impeller condition.	Water pump kit, thermostat, intake screen, telltale hose/grommet.
Hard starting or rough idle	Confirm fresh fuel, primer bulb firmness, choke/enrichment function, and spark plug condition/gap.	Spark plugs, fuel filter, fuel line/primer bulb, carburetor components.
Poor acceleration or power loss	Inspect propeller for bent blades or a slipped hub, check for fuel restriction, and verify compression.	Propeller, fuel filter, spark plugs, air intake screen.
Excessive smoke (2‑Stroke)	Confirm correct oil mix ratio, check choke stuck “on”, and look for flooding.	Spark plugs, carburetor needle/float, fuel lines.
Gearcase noise or metal in gear oil	Check oil level and color; look for water intrusion; inspect prop shaft seals after fishing line wraps.	Lower unit seal kit, drain/fill plug seals, prop shaft seals, gear oil.

FAQs

Are parts interchangeable between different years or platforms?

Some items interchange within the same platform (for example, many 4/5/6 HP 4‑Stroke parts). However, 2‑Stroke and 4‑Stroke parts generally do not interchange. Always confirm using your exact model code, suffixes, and serial number.

When should I replace the water pump impeller?

As a rule of thumb, replace every 2–3 seasons or sooner if the telltale weakens, the engine overheats, or the impeller shows wear. Sand, silt, or frequent beaching shortens service life.

How often should I change the gear oil?

Change gear oil every 100 hours or annually. Inspect for milky color (water), burnt smell, or metal particles. If contaminated, service seals before refilling.

What information helps confirm part compatibility?

Please provide the model code, serial number, shaft length (S/L), start type (manual/electric), and a clear photo of the nameplate. Noting any options (charger coil, remote vs tiller) also helps.

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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.