Tohatsu 15HP 2-Stroke Outboard Engine Parts

(12 products)

This page focuses on Tohatsu 2‑Stroke 15HP outboard engines. Use it to find compatible parts and practical service information, including maintenance tips, common replacement items, and troubleshooting guidance. You can also browse the main Tohatsu collection for a wider selection. Scroll to the bottom of this page 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.

Browse All Tohatsu Parts

How to Identify Your 15HP Model

Locate the model/serial plate on the transom bracket or clamp bracket. It lists model code, shaft length, and serial number.
Model code basics: examples include M15 or NS15 followed by suffix letters for features (e.g., E = electric start, S/L = short/long shaft). The suffix can also hint at the production year or revision.
2‑Stroke identifiers: no crankcase oil fill/dipstick; premix fuel required unless oil‑injected. Many 9.9/15/18 HP Tohatsu/Nissan 2‑strokes share core components.
Confirm details on the nameplate and cowling label before ordering; small differences in carburetor jetting, ignition, or gearcase can affect parts compatibility.

Engine Overview

Tohatsu 15HP 2‑Stroke (Twin‑Cylinder)

Feature	Description
Configuration	Inline 2‑cylinder, carbureted 2‑stroke with reed induction
Common Models	Tohatsu/Nissan M15, NS15; closely related to 9.9HP and 18HP siblings in many components
Advantages	Lightweight, simple design, strong low‑to‑mid RPM torque, straightforward maintenance
Notes	Many service parts (impeller, gaskets, ignition items) interchange across 9.9/15/18HP, but carburetor specs and some gearcase parts vary—verify by model/serial.

Routine Maintenance & Service Parts

Intervals below are general guidelines for typical recreational use. Always follow the official service manual and adjust intervals for heavy use or harsh conditions.

Item	Interval*	Remarks	Parts Link
Gear oil (lower unit)	Every 100 hours or annually	Check for water/milky oil and metal debris; renew seals if contamination is found.	Tohatsu Lower Unit Seal Kits
Spark plugs	Inspect 50 hours; replace annually or as needed	Use the correct heat range and gap; replace if fouled or worn.	Spark Plugs
Fuel filter (inline)	Every 100 hours or annually	Replace sooner if fuel quality is questionable or after storage.	Fuel Filters
Water pump impeller / kit	Inspect annually; replace every 2–3 seasons or if flow is weak	Critical for cooling; sandy/silty water shortens life—service more often.	Tohatsu Water Pump Repair Kits
Anodes (sacrificial)	Inspect 50 hours; replace when 50% eroded	Match anode material to water type (zinc, aluminum, or magnesium).	Anodes
Premix ratio / oil‑injection check (2‑Stroke)	Each fill‑up; inspect seasonally	Use fresh gasoline with TC‑W3 2‑stroke oil at the specified ratio (commonly 50:1) unless equipped with oil injection. Inspect oil tank, lines, and screens.	Tohatsu Outboard Parts
Propeller inspection	Every 50 hours or after impact	Remove and grease the shaft; repair/replace damaged blades to prevent cavitation.	Propellers

Frequently Used Parts Categories

Cooling System – Tohatsu Water Pump Repair Kits
Fuel System – Fuel Filters and Fuel Pumps
Carburetion – Carburetor
Ignition / Electrical – Spark Plugs
Lower Unit Sealing – Tohatsu Lower Unit Seal Kits
Propulsion – Propellers
Corrosion Protection – Anodes

Common Symptoms & Quick Checks

Symptom	Check First	Related Parts
Weak telltale stream / overheat alarm	Inspect intake screens for blockage; verify impeller condition; check thermostat operation.	Water pump kit, thermostat, intake screen
Poor acceleration / power loss	Check propeller for dings or spun hub; inspect fuel filter and lines; clean carburetor jets; test fuel pump output.	Propeller, fuel filter, carburetor kit, fuel pump
Hard starting / rough idle	Verify choke/enrichment function; replace or regap spark plugs; confirm fresh fuel; check for air leaks at fuel connector/lines.	Spark plugs, carburetor, fuel filter, fuel line connector
Excessive smoke (2‑Stroke)	Confirm correct premix ratio; ensure choke is not stuck on; verify thermostat closes to reach proper temp.	Spark plugs, carburetor, thermostat
Gearcase noise / metal in gear oil	Drain and inspect oil; pressure/vacuum test; replace seals and inspect bearings if water intrusion is present.	Lower unit seal kit, prop shaft seals, bearings

FAQs

Are parts interchangeable between 9.9HP, 15HP, and 18HP Tohatsu 2‑strokes?

Many components are shared across these engines, but there are important differences in carburetor calibration, intake, and some gearcase parts. Always verify by model code, serial number, and shaft length before ordering.

When should I replace the impeller?

Inspect it annually and replace every 2–3 seasons for recreational use, or sooner if you notice a weak telltale stream, overheating, or if the engine operates in sandy/silty water.

How often should I change lower unit gear oil?

Every 100 hours or annually. If the drained oil is milky or contaminated with metal, inspect seals and internal components before further use.

What information helps confirm part compatibility?

Provide the model code (including suffix letters), serial number, shaft length (S/L/XL), and whether the engine has tiller or remote controls. Photos of the nameplate and the part needing replacement are also helpful.

Ready to find parts for your Tohatsu by horsepower, year, and model? Browse the main Tohatsu collection to get started.

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.