Tohatsu 4-Stroke 115-140HP Outboard Engine Parts

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This page is dedicated to Tohatsu 4‑Stroke 115–140HP outboard engines. Use it to find compatible parts and key service information, including maintenance tips, common replacement items, and troubleshooting guidance. You can also browse our 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 115–140HP Model

Nameplate location: Look for the model/serial plate on the transom bracket or clamp bracket; the same information is often repeated on a sticker under the engine cowling.
Model code and suffix: The code typically indicates horsepower and features. Suffix letters/numbers denote shaft length (L/XL), control type (remote/tiller), and revision/year coding.
4‑Stroke identifiers: EFI fuel system components, an oil filter on the powerhead, and a maintenance label under the cowling distinguish these from 2‑stroke platforms.
Accessories context: Gauges, control boxes, and harnesses may vary by steering/rigging style; verify with the serial to ensure wiring and connector compatibility.

Engine Platform Overview

115–140HP 4‑Stroke Inline‑4

Feature	Description
Configuration	Inline‑4, EFI 4‑stroke with electronic ignition and freshwater‑flush provision.
Common Models	115–140HP 4‑stroke outboards in the mid‑range family; variations by shaft length, rigging, and model year.
Advantages	Good fuel economy, low noise and vibration, strong mid‑range torque for heavier hulls.
Notes	Many service parts are shared across the 115–140 range, but prop pitch, gear ratio, and rigging components can differ. Verify with the engine serial before ordering.

Routine Maintenance & Service Parts

Intervals below are general guidelines for typical recreational use. Always follow the official service manual for your specific engine and duty cycle.

Item	Interval*	Remarks	Parts Link
Engine oil + filter	100 hours or annually	Warm engine before draining; replace crush washer if required; verify oil spec/quantity.	Oil Filters
Gear oil (lower unit)	100 hours or annually	Inspect magnet and oil for metal; replace drain/fill gaskets; pressure test if water intrusion suspected.	Tohatsu Lower Unit Seal Kits
Spark plugs	100–200 hours or annually	Check heat range and gap; replace if fouled, worn, or out of spec.	Spark Plugs
Fuel filter / water separator	100 hours or as needed	Drain/inspect for water and debris; replace if flow is restricted or contamination is present.	Fuel Filters
Water pump impeller/kit	2 seasons or 200 hours (inspect annually)	Replace sooner if stream weakens or after sand/silt use; consider full kit with wear plate and gaskets.	Tohatsu Water Pump Repair Kits
Anodes (internal/external)	Inspect every 50 hours; replace when 50% depleted	Use the correct alloy for your water (zinc, aluminum, or magnesium). Maintain good electrical bonding.	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
Corrosion Protection: Anodes
Sealing & Gaskets: Gaskets
Propulsion: Propellers

Common Symptoms & Quick Checks

Symptom	Check First	Related Parts
Weak tell‑tale stream or overheat alarm	Inspect intake screens for blockage; verify water pump output; check thermostat operation.	Water pump kit, intake screen, thermostat, gaskets
Poor acceleration or power loss	Check prop for damage/cavitation; replace fuel filters; inspect spark plugs; verify clean fuel and correct prop pitch.	Propeller, fuel filter, spark plugs, fuel pump screen
Hard starting or rough idle	Confirm battery voltage and connections; inspect plugs and ignition leads; check for air leaks in fuel line and stale fuel.	Spark plugs, fuel filter, primer bulb/hoses, starter/battery cables
Gearcase noise or metal in gear oil	Drain and inspect oil; check for water intrusion; perform seal and bearing inspection; verify correct prop hub.	Lower unit seal kit, carrier seals, drain/fill gaskets, prop hub

FAQs

Are parts interchangeable between 115HP and 140HP models?

Many routine service parts cross over within the 115–140HP inline‑4 family, but items like propellers, gear ratios, and certain sensors/rigging components can differ. Always confirm with the full model/serial information.

When should I replace the impeller?

Inspect annually and replace every 2 seasons or about 200 hours. Replace sooner if you see a weak tell‑tale stream, after heavy silt/sand use, or whenever the pump housing shows wear.

How often should lower unit gear oil be changed?

Change at least every 100 hours or annually. If the oil appears milky, metallic, or has water, service immediately and pressure test the gearcase to check seals.

What information helps confirm part compatibility?

Provide the model code, full serial number, shaft length (L/XL), control type (remote/tiller), and any existing part numbers. Photos of the nameplate and the part being replaced are helpful.

Ready to find parts by horsepower, year, and model? Browse our main Tohatsu collection and use the filters 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.