Tohatsu 4-Stroke 8-50HP Outboard Engine Parts

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This page is dedicated to Tohatsu 4-Stroke 8–50HP outboard engines. Use it to 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. Scroll to the bottom of the page to start browsing parts for this engine, and remember that on the collection page you can use the Filter & Sort controls to narrow results by horsepower, year range, and part category.

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How to Identify Your 8–50HP Model

Locate the identification plate on the transom clamp bracket or swivel bracket; it lists the model code and serial number.
For 4-stroke Tohatsu models, codes often begin with “MFS” followed by horsepower (e.g., MFS9.8, MFS20, MFS30, MFS50). Suffix letters indicate shaft length (S/L/UL), start/controls (E for electric start, T for power trim/remote), and revision.
Verify whether your engine is carbureted or EFI (many 25–50HP are EFI; some smaller portables are carbureted). Parts like fuel and ignition components can differ by system and year.
Record the serial number when ordering; gasket sets, water pump kits, and lower unit seals can vary across revisions.

Engine Platform Overview

Portable Twin-Cylinder (8–9.8HP)

Feature	Description
Configuration	Compact 2-cylinder, 4-stroke, typically carbureted; designed for portability and tiller control.
Common Models	MFS8, MFS9.8 (various shaft lengths and start options).
Advantages	Lightweight, easy to transport, excellent fuel economy at displacement speeds.
Notes	Verify model suffix for impeller and gearcase parts; ignition and carburetor details can vary by year.

Mid Portable Twin-Cylinder (15–20HP)

Feature	Description
Configuration	2-cylinder 4-stroke; earlier units may be carbureted, later versions commonly use EFI.
Common Models	MFS15, MFS20 with S/L shaft options, manual or electric start, tiller or remote.
Advantages	Strong low-end torque for mid-size inflatables and small skiffs; EFI variants start easily and run cleanly.
Notes	Fuel and ignition components differ between carb and EFI; confirm serial number for accurate kit selection.

Inline-3 Midrange (25–30HP)

Feature	Description
Configuration	Inline-3, 4-stroke, commonly EFI; smooth running and efficient.
Common Models	MFS25, MFS30 with manual/electric start, power trim options.
Advantages	Balanced performance for utility skiffs and light pontoons; reliable cooling and charging systems.
Notes	Many water pump and gearcase parts are shared across close HP ratings; verify shaft length and gear ratio when ordering.

Inline-3 EFI (40–50HP)

Feature	Description
Configuration	Inline-3, EFI 4-stroke; popular with remote controls and power trim/tilt.
Common Models	MFS40, MFS50 with S/L/UL shafts and various control kits.
Advantages	Good fuel economy, broad torque, and clean emissions via EFI.
Notes	Match model suffix for correct thermostat, anodes, and water pump kits; prop selection influences holeshot and top speed.

Routine Maintenance & Service Parts

Intervals below are general guidelines for 4-stroke outboards; always follow your specific Tohatsu service manual and local operating conditions.

Item	Interval*	Remarks	Parts Link
Engine oil + filter	First 20 hours, then every 100 hours or annually	Use marine 4-stroke oil; replace filter with each oil change.	Oil Filters
Gear oil (lower unit)	Every 100 hours or annually	Inspect for water intrusion or metal particles; reseal if contamination is found.	Tohatsu Lower Unit Seal Kits
Spark plugs	Inspect every 100 hours; replace as needed	Use correct heat range and gap; replace if fouled or worn.	Spark Plugs
Fuel filter / water-separating filter	Inspect every 50–100 hours; replace 100–200 hours	More frequent service in dusty or high-moisture environments.	Fuel Filters
Water pump impeller / kit	Every 2–3 seasons or 200 hours	Shorten interval for sandy, silty, or shallow operation.	Tohatsu Water Pump Repair Kits
Anodes (internal & external)	Inspect every 50 hours; replace when 50% depleted	Use the correct alloy for fresh, brackish, or salt water.	Anodes

Frequently Used Parts Categories

Routine Service: Service & Maintenance Kits
Cooling System: Tohatsu Water Pump Repair Kits
Fuel System: Fuel Filters
Ignition / Electrical: Electrical Items, Starters, Rectifiers
Propulsion & Drivetrain: Propellers, Tohatsu Lower Unit Seal Kits
Corrosion Protection: Anodes
Accessories: 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 debris, verify impeller condition, ensure tell‑tale hose isn’t blocked; check thermostat operation.	Water pump kit, intake screen, thermostat, anodes
Hard starting or rough idle	Confirm fresh fuel and proper priming; check inline fuel filter; inspect plugs; for EFI, verify battery voltage and connector integrity.	Fuel filter, spark plugs, electrical connectors; carburetor parts or injector service (as equipped)
Poor acceleration or power loss	Examine propeller for damage or fouling; look for fuel restriction; perform compression and spark checks; verify throttle linkage/ECU faults.	Propeller, fuel filter, spark plugs, ignition components
Gearcase noise or metal in gear oil	Check oil level and color; look for milky oil (water ingress); inspect prop shaft for fishing line; pressure test gearcase.	Lower unit seal kit, bearings, shims
Low charging voltage or battery not maintaining charge	Test battery and grounds; inspect rectifier‑regulator and stator output; check for corroded connectors.	Rectifier/regulator, stator, wiring/terminals

FAQs

Are parts interchangeable between different years or platforms?

Some gaskets, anodes, and service items overlap between close model years or HP variants, but ignition, fuel, and gearcase components often change with updates. Always confirm using the exact model code, suffix, and serial number.

When should I replace the water pump impeller?

As a preventive measure every 2–3 seasons or about 200 hours. Shorten the interval if you operate in sandy, silty, or weedy water, or if the tell‑tale becomes weak.

How often should gear oil be changed?

At least every 100 hours or annually. If the oil appears milky or contaminated, reseal and service the gearcase before further use.

What information helps confirm part compatibility?

Provide the full model code (including suffix), serial number, shaft length, start/control type (manual/electric, tiller/remote), and whether your engine is carbureted or EFI.

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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.