Tohatsu 4-Stroke 16HP Outboard Engine Parts

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This page is tailored for Tohatsu 4‑Stroke 16HP outboard engines. Use it to find compatible parts, routine service guidance, and troubleshooting tips. You can also browse the main Tohatsu collection for a broader selection. Scroll to the bottom of the page to start browsing parts for this engine, and remember you can use the “Filter & Sort” controls on the collection page to narrow results by horsepower, year range, and part category.

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How to Identify Your 16HP Model

Find the nameplate/serial plate on the transom bracket (usually port side). It lists the model code, serial number, and shaft length.
Model codes often start with “MFS” for 4‑stroke Tohatsu. Suffix letters typically indicate features: S/L for 15"/20" shaft, E for electric start, and remote/tiller variations.
Many 16HP variants share a platform with the 15–20HP family. Confirm displacement and features to ensure parts compatibility.
4‑stroke models have an engine oil fill and spin‑on/element oil filter; this helps distinguish them from older 2‑stroke units.

Engine Overview

Tohatsu 16HP 4‑Stroke Family

Feature	Description
Configuration	2‑cylinder SOHC 4‑stroke; earlier variants typically carbureted, later versions may use EFI depending on market and year.
Common Models	Often related to the MFS15/MFS18/MFS20 family. 16HP models may be market‑specific, detuned, or option‑limited versions within this platform.
Advantages	Quiet operation, good low‑end torque for planing small boats, and broad parts availability due to shared family components.
Notes	Many service items (impeller kit, anodes, spark plugs, filters) cross over with 15–20HP 4‑stroke siblings. Always match by model code and serial to confirm.

Routine Maintenance & Service Parts

Intervals below are general guidelines for typical recreational use. Always refer to your official service manual for model‑specific procedures and schedules.

Item	Interval*	Remarks	Parts Link
Engine oil & filter	Every 100 hours or annually	Warm engine before draining; replace crush washer if equipped.	Oil Filters
Gear oil (lower unit)	Every 100 hours or annually	Inspect for metal flakes/water intrusion; replace seals if contamination is found.	Tohatsu Lower Unit Seal Kits
Spark plugs	Inspect 100 hours; replace 200 hours or as needed	Check gap and insulator color; replace if fouled or eroded.	Spark Plugs
Fuel filter / water‑separating filter	Every 100 hours or annually	Replace sooner if fuel contamination or ethanol phase separation is suspected.	Fuel Filters
Water pump impeller/kit	Every 100–200 hours or 1–2 seasons	Replace sooner if weak tell‑tale stream or overheat warnings occur.	Tohatsu Water Pump Repair Kits
Anodes (engine & gearcase)	Inspect monthly; replace at ~50% consumed	Choose zinc for saltwater, aluminum/magnesium for brackish/fresh per local guidance.	Anodes
Thermostat (inspect/replace)	Inspect annually; replace 2–3 years or if cooling issues	Stuck thermostats cause cold‑running or overheat; always use a new gasket.	Tohatsu Outboard Parts

Frequently Used Parts Categories

Cooling System: Tohatsu Water Pump Repair Kits
Gearcase & Seals: Tohatsu Lower Unit Seal Kits
Ignition Service: Spark Plugs
Fuel System: Fuel Filters
Propellers & Hardware: Propellers
Corrosion Protection: Anodes
Accessories: Boat Accessories

Common Symptoms & Quick Checks

Symptom	Check First	Related Parts
Weak tell‑tale stream or overheat alarm	Inspect intake screen for debris; verify impeller age; check thermostat operation.	Water pump repair kit, intake screen, thermostat, gaskets
Hard starting or rough idle	Confirm fresh fuel; replace/inspect fuel filter; check spark plug gap and condition; verify choke/EFI prime.	Fuel filter, spark plugs, primer bulb/lines, EFI components (if equipped)
Poor acceleration or power loss	Check prop for damage/cavitation; verify throttle opening; inspect plugs and compression; confirm correct prop pitch.	Propeller, spark plugs, fuel system service parts, air intake components
Gearcase noise or milky gear oil	Drain and inspect gear oil; check prop shaft seal and drain/fill screw gaskets.	Lower unit seal kit, gear oil drain/fill gaskets, prop hub hardware
Excessive vibration	Inspect prop for bent blades; check engine mounting and idle speed; verify spark on both cylinders.	Propeller, prop hardware, ignition service parts, mounts

FAQs

Are parts interchangeable between different years or within the 15–20HP platform?

Many service items are shared across the 15–20HP 4‑stroke family, but ignition, intake, and control‑related parts can change by year or sub‑series. Match by full model code and serial number before ordering.

When should the impeller be replaced?

As a rule of thumb, every 100–200 hours or 1–2 seasons for recreational use. Replace sooner if you see a weak tell‑tale stream, run sandy/shallow water, or encounter any overheat alarms.

How often should gear oil be changed?

Change gear oil every 100 hours or annually. If water or metal is found in the oil, service seals before returning to use.

What information helps confirm part compatibility?

Provide the complete model code, serial number, shaft length (S or L), starting/control type (manual/electric, tiller/remote), and a clear photo of the nameplate and the part you are replacing.

Ready to find parts by horsepower, year, and model? Browse our main Tohatsu collection and use the Filter & Sort controls to narrow your results.

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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.