Tohatsu 2-6 HP 4-Stroke Outboard Parts

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This page supports Tohatsu 4‑Stroke 2–6 HP outboard engines and helps you quickly find compatible parts and service information. Below you’ll find maintenance tips, common replacement parts, and troubleshooting guidance. You can also browse the main Tohatsu collection any time, and at the bottom of this page you’ll find a direct link 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/serial plate: Look on the clamp bracket and on the cylinder block casting for the model/serial. Photograph this plate before ordering parts.
Model code and suffix: Examples for this class include MFS4C, MFS5C, MFS6C with shaft suffixes S/L/UL (short/long/ultra‑long). “SP” indicates a charging/alternator variant on some models. Controls may be tiller by default with optional remote on select versions.
4‑Stroke identifiers: You’ll see an engine oil fill cap/dipstick and no separate 2‑stroke oil tank. Fuel may be from an integral tank or a separate 12 L portable tank depending on model.
Prop/rigging details: Shaft length and prop pitch affect parts selection (e.g., propellers, driveshaft components). Verify these from your nameplate and current rigging.

Platform Overview

Tohatsu 4/5/6 HP “C” Series (example: MFS4C/MFS5C/MFS6C)

Feature	Description
Configuration	Single‑cylinder, water‑cooled, carbureted 4‑stroke, manual start. Through‑hub exhaust. Designed for portable use and small craft.
Common Models	MFS4C, MFS5C, MFS6C (S/L/UL). “SP” variants include a charging coil on select models. Optional remote control available on certain versions.
Advantages	Lightweight, quiet operation, low fuel consumption, simple routine service, and strong low‑speed torque for tenders and small inflatables.
Notes	Typical service items include spark plugs (e.g., NGK DCPR6E with 0.8–0.9 mm gap), engine oil changes, lower‑unit gear oil, and water pump impeller. Oil and gear oil quantities are small on this platform; always confirm capacities and procedures in your official service manual.

Routine Maintenance & Service Parts

Intervals below are general guidelines for small Tohatsu 4‑stroke portables. Always follow the procedures, specifications, and safety instructions in your official service manual.

Item	Interval*	Remarks	Parts Link
Engine oil (FC‑W 10W‑30/10W‑40)	First 20 hrs, then every 100 hrs or annually	Warm engine, drain fully, refill to dipstick mark. Do not overfill. Typical capacity is small on 4/5/6 HP; confirm in your manual.	Tohatsu Outboard Parts
Lower‑unit gear oil	Every 100 hrs or annually	Drain from bottom, fill from below until it exits top plug. Inspect for water (milky oil). Replace seals if intrusion is found.	Tohatsu Lower Unit Seal Kits
Spark plug(s)	Inspect every 100 hrs; replace 200 hrs or as needed	Use the specified heat range (e.g., NGK DCPR6E on many 4/5/6C). Gap typically 0.8–0.9 mm; confirm for your model.	Spark Plugs
Fuel filter(s)	Inspect every 50–100 hrs; replace as needed	Check in‑engine screen and portable tank pickup. Consider a water‑separating filter when using a separate 12 L tank.	Fuel Filters
Water pump impeller/kit	Every 1–2 seasons (or 200 hrs)	Replace sooner for sandy/silty use or weak tell‑tale stream. Always verify correct kit for your model and shaft length.	Tohatsu Water Pump Repair Kits
Anodes (sacrificial)	Inspect every 50 hrs; replace when ~30% eroded	Never paint or grease anodes. Check more often in brackish/salt water.	Anodes
Propeller (inspection/selection)	Check frequently	Inspect for damage and correct pitch. Small Tohatsu 4/5/6 HP often run 6–9" pitches; verify for your hull and load.	Propellers

*Intervals are typical for small portable 4‑stroke outboards; always defer to your engine’s official service schedule.

Frequently Used Parts Categories

Routine Service Kits and essentials: Service & Maintenance Kits
Cooling system (impellers, pump kits): Tohatsu Water Pump Repair Kits
Gearcase seals and rebuild items: Tohatsu Lower Unit Seal Kits
Propellers and hardware: Propellers
Ignition & Electrical (plugs, small electrical): Electrical Items · Spark Plugs
Corrosion protection: Anodes
Convenience add‑ons: Boat Accessories · Propeller Guards · Outboard Hydrofoil Stabilizers

Common Symptoms & Quick Checks

Symptom	Check First	Related Parts
Weak tell‑tale stream or overheat alarm	Inspect intake screens for blockage; verify impeller condition; confirm thermostat function; ensure tell‑tale is not obstructed.	Water pump kit/impeller, intake screen, thermostat, gaskets
Hard starting or rough idle	Confirm fresh fuel; check/replace spark plug and gap; prime bulb until firm; verify choke/fast idle use on cold starts; inspect in‑line/tank filters.	Spark plug, fuel filter, primer bulb/connector, carburetor service parts
Poor acceleration or power loss	Check prop for bent blades; drain contaminated fuel; inspect fuel filter and venting; verify throttle linkage; confirm correct prop pitch and load.	Propeller, fuel filter, fuel tank cap/vent components, spark plug
Gearcase noise or milky gear oil	Change gear oil and inspect for water; check prop shaft seal for fishing line damage; evaluate drain/fill plug gaskets.	Lower‑unit seal kit, plug gaskets, bearings (as required)

FAQs

Are parts interchangeable between different years or platforms?

Many items are shared within the MFS4C/5C/6C family, but changes by year, shaft length, and charging/remote options can affect fitment. Provide your full model code, serial number, and shaft length to confirm compatibility.

When should the impeller be replaced?

As a rule, inspect annually and replace every 1–2 seasons (or ~200 hours). Replace sooner if you see a weak tell‑tale stream, overheating, or if the engine was run dry or in sandy water.

How often should the lower‑unit gear oil be changed?

At least once per season or every 100 hours. If you find milky oil or metal debris, service seals and inspect internal components before further use.

What information do you need to verify parts?

Send the model code (e.g., MFS6C), serial number, shaft length (S/L/UL), control type (tiller or remote), and a photo of the nameplate and the part you’re replacing. This ensures the most accurate match.

Ready to find parts? Browse the main Tohatsu collection and use the Filter & Sort tools to narrow by horsepower, year range, and part category.

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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.