Tohatsu 2-Stroke Outboard Engine 25-300HP Parts

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This page is tailored for Tohatsu 2‑Stroke outboard engines in the 25–300HP class. 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 for a broader selection. Scroll to the bottom of this page to start browsing parts for this engine, and remember 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 25–300HP Model

Nameplate/serial plate: Typically found on the transom bracket or swivel bracket. Match the model code and serial number to verify year and configuration.
Reading the model code: The base model identifies horsepower and family; suffix letters usually indicate shaft length (e.g., S/L/XL), starting and control type (manual/electric, tiller/remote), and sometimes market year.
Carbureted vs. direct‑injection: Classic 2‑strokes are carbureted; TLDI models (e.g., 90/115) use direct fuel injection and have additional fuel/air components and an ECU.
Visual cues: Cylinder count and cowl decals help distinguish small twin/compact triple models (25–40 HP) from inline‑3 midrange (40–90 HP) and TLDI (90–115 HP) platforms.

Platform Overview

25–40 HP Carbureted Two‑Stroke

Feature	Description
Configuration	Twin or compact inline 2/3‑cylinder, carbureted 2‑stroke; manual or electric start, tiller or remote.
Common Models	25–30HP 2‑Stroke models; some 40HP variants (inline‑3) in this transition range.
Advantages	Light weight, simple maintenance, strong hole‑shot for small boats.
Notes	Carburetor cleanliness and correct fuel/oil supply are critical. Water pump service reduces overheat risk in shallow or silty water.

40–90 HP Inline‑3 Carbureted Two‑Stroke

Feature	Description
Configuration	Inline‑3 carbureted 2‑stroke; mechanical fuel pump; CDI ignition.
Common Models	40/50/60/70/90HP 2‑Stroke models.
Advantages	Good power‑to‑weight ratio, straightforward diagnostics, broad parts availability for wear items.
Notes	Keep an eye on impeller condition and fuel filtration; ethanol‑related fuel issues are common on carbureted engines.

90–115 HP TLDI Direct‑Injection Two‑Stroke

Feature	Description
Configuration	Direct‑injected 2‑stroke (TLDI) with high‑pressure fuel/air system and ECU control.
Common Models	90HP and 115HP TLDI families.
Advantages	Improved fuel economy and lower smoke vs. carbureted 2‑strokes; strong mid‑range torque.
Notes	Use clean, stabilized fuel and service filters regularly. Cooling system condition is critical to injector and compressor longevity.

Routine Maintenance & Service Parts

Intervals below are general guidelines for typical recreational use. Always follow the specific procedures and schedules in your official service manual.

Item	Interval*	Remarks	Parts Link
Gear oil (lower unit)	Every 100 hours or annually	Check for metal or milky oil (water intrusion). Replace seals if contamination is found.	Tohatsu Lower Unit Seal Kits
Spark plugs	Inspect every 50 hours; replace 100 hours or annually	Use correct heat range and gap; fouling often indicates rich mix or idle issues.	Spark Plugs
Fuel filter / inline filter	Inspect 50 hours; replace 100 hours or annually	Essential for ethanol fuel; replace more often if debris is present.	Fuel Filters
Water pump impeller / kit	Every 2 seasons or 200 hours (sooner for sandy/shallow use)	Weak tell‑tale stream or overheat alarm usually indicates impeller wear.	Tohatsu Water Pump Repair Kits
Anodes (internal & external)	Inspect 50 hours; replace when 50% consumed	Match alloy to water type (fresh, brackish, salt). Ensure bonding is clean and tight.	Anodes
Thermostat inspection	Every 2 seasons	Sticking thermostats cause cold running or overheat; replace gasket on reassembly.	Tohatsu Outboard Parts
Oil injection system (if equipped)	Annually	Inspect oil tank, lines, and pump calibration; for premix, verify ratio as specified in the manual.	Hoses

Frequently Used Parts Categories

Routine Service: Service & Maintenance Kits
Cooling System: Tohatsu Water Pump Repair Kits
Fuel System: Fuel Filters and Fuel Pumps
Carburetion: Carburetor
Ignition / Electrical: Electrical Items
Lower Unit & Sealing: Tohatsu Lower Unit Seal Kits
Corrosion Protection: Anodes

Common Symptoms & Quick Checks

Symptom	Check First	Related Parts
Weak tell‑tale stream / overheat alarm	Inspect intake screen for blockage; verify impeller age; check thermostat for sticking.	Water pump kit, impeller, thermostat, intake screen
Hard starting / rough idle	Prime fuel system; check for stale fuel; inspect plugs and carb idle circuits; verify choke/enrichment.	Spark plugs, carburetor kit, fuel filter, primer bulb/line
Poor acceleration / power loss	Compression test; confirm timing/ignition; check fuel delivery and exhaust restriction.	Fuel pump, carb jets/needles, ignition components, propeller condition
Excessive smoke (2‑stroke)	Verify oil ratio (premix) or oil pump setting; confirm thermostat function; check for rich idle mixture.	Oil lines/pump, thermostat, carburetor needles/seats
Gearcase noise / metal in gear oil	Drain and inspect gear oil; check for water intrusion; verify prop shaft seal and fishing line damage.	Lower unit seals, bearings, water pump base/seal

FAQs

Are parts interchangeable between different years or platforms?

Some wear items (impellers, anodes, filters, spark plugs) span multiple years, but many components differ by model code, shaft length, and ignition/fuel system (carb vs. TLDI). Always verify by model and serial.

When should I replace the impeller?

Inspect annually and replace every 2 seasons or ~200 hours. In sandy/silty or high‑heat operation, replace sooner. Any overheat event warrants inspection of the full pump kit.

How often should gear oil be changed?

Every 100 hours or at least once per year. If oil looks milky or metallic, service immediately and inspect/replace seals.

What information helps confirm part compatibility?

Provide the exact model code, serial number, horsepower, shaft length, and a photo of the nameplate. Notes about starting/controls (manual/electric, tiller/remote) and carbureted vs. TLDI also help.

Ready to find parts by horsepower, year, and model? Browse the main Tohatsu collection to refine with Filter & Sort and locate the exact components for your engine.

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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.