Tohatsu 115HP 2-Stroke Outboard Marine Engine Parts

(15 products)

This page is for Tohatsu 2-Stroke 115HP outboard engines. Use it to find compatible parts and service information, including maintenance tips, common replacement parts, and troubleshooting guidance. You can also browse the main Tohatsu collection, and at the bottom of this page you’ll find a quick way 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.

Browse All Tohatsu Parts

How to Identify Your 115HP Model

Find the nameplate/serial plate on the transom bracket or swivel bracket (usually on the port side). Record model code, serial number, and shaft length.
Model codes for carbureted 2-strokes often look like M115A2 with suffixes that indicate options: S/L/X for shaft length, E for electric start, and T for power trim & tilt.
2-Stroke identification: carburetors and an external or remote oil tank (for oil-injected models) are common; there is no crankcase engine oil like on 4-strokes.
If parts interchange with Nissan-branded equivalents, always confirm using the exact model code and serial range before ordering.

Engine Overview

Tohatsu 115HP 2‑Stroke (M115A2 family)

Feature	Description
Configuration	Carbureted 2‑stroke, inline multi‑cylinder with oil injection (if equipped). Conventional magneto ignition with C.D. unit and separate oil pump.
Common Models	M115A2 and related 115HP 2‑stroke variants from the early‑2000s era.
Advantages	Relatively light for its class, simple carbureted layout, strong mid‑range torque.
Notes	Verify model code/shaft length to confirm parts. Many wear items overlap with Nissan‑branded equivalents. Maintain the cooling system and gearcase to protect the powerhead.

Routine Maintenance & Service Parts

Intervals below are general guidelines for typical recreational use. Always follow the official service manual for your exact model and operating conditions.

Item	Interval*	Remarks	Parts Link
Gear oil (lower unit)	Every 100 hours or annually	Check for water intrusion or metal on the magnet; reseal if milkiness or leaks are found.	Tohatsu Lower Unit Seal Kits
Spark plugs	Inspect every 50 hours; replace ~100 hours/season	Use correct heat range and gap; fouling increases with extended idling or rich mixture.	Spark Plugs
Fuel filter / inline filter	Inspect every 50 hours; replace as needed	Keep a spare on board; ethanol fuels and debris can restrict flow.	Fuel Filters
Water pump impeller / kit	Every 2–3 seasons or 200 hours	Replace sooner if weak tell‑tale, running sandy/silty water, or overheat alarms.	Tohatsu Water Pump Repair Kits
Anodes (internal/external)	Inspect every 50 hours; replace when 50% consumed	Choose alloy for your waters (aluminum for brackish, zinc for salt, magnesium for fresh).	Anodes
Oil injection system (if equipped)	Annually	Verify pump output, bleed any air, and inspect hoses/tank. Use quality TC‑W3 oil.	Tohatsu Outboard Parts
Propeller service	Inspect each trip; remove/grease splines seasonally	Check for fishing line at seal, nicks, or bent blades; verify hub integrity.	Propellers

Frequently Used Parts Categories

Routine Service: Tohatsu Water Pump Repair Kits
Gearcase & Sealing: Tohatsu Lower Unit Seal Kits
Fuel System: Fuel Filters
Ignition / Electrical: Electrical Items
Corrosion Protection: Anodes
Propulsion: Propellers

Common Symptoms & Quick Checks

Symptom	Check First	Related Parts
Weak tell‑tale or overheat alarm	Inspect intake screens for blockage; verify impeller condition; confirm thermostat operation.	Water pump kit, intake screen, thermostat, anodes.
Poor acceleration / power loss	Check fuel quality and filters; inspect carburetor jets and synchronization; verify compression and reed valves.	Fuel filter, carburetor components, spark plugs, reeds, propeller (hub slip).
Hard starting / rough idle	Verify spark on all cylinders; primer bulb firmness; choke/enrichment function; look for air leaks in fuel lines.	Spark plugs, fuel pump/diaphragm, fuel lines, starter-related components.
Excessive smoke (2‑stroke)	Confirm oil injection setting or premix ratio; ensure engine is up to temperature; check for stuck choke.	Oil injection components, spark plugs, choke/enrichment parts.
Gearcase noise or metal in oil	Drain and inspect oil; check prop shaft for fishing line damage; pressure/vacuum test for seal leaks.	Lower unit seal kit, bearings, gearset, propeller hardware.

FAQs

Are parts interchangeable between different years or platforms?

Some parts interchange across close model years and Nissan‑branded equivalents, but others are model‑specific. Always confirm with your exact model code and serial number before ordering.

When should I replace the water pump impeller?

As a rule of thumb every 2–3 seasons or about 200 hours. Replace sooner if the tell‑tale weakens, you operate in sandy/silty water, or after any overheat event.

How often should I change lower unit gear oil?

Change every 100 hours or annually, and always before off‑season storage. Inspect for water (milky oil) or metal debris; reseal the gearcase if contamination is found.

What information do you need to confirm part compatibility?

Please provide the model code (e.g., M115A2), serial number, shaft length, and options such as electric start or power trim & tilt. A clear photo of the nameplate helps us verify the correct parts.

Ready to find parts for your Tohatsu by horsepower, year, and model? Browse our full selection to get the right fit for your 115HP 2‑Stroke.

Shop Tohatsu Outboard Parts

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.