Tohatsu 2-Stroke 105HP Outboard Marine Engine Parts

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This page is dedicated to Tohatsu 2-Stroke 105HP outboard engines. Use it to locate compatible parts and practical service information. Below you’ll find maintenance tips, common replacement part guidance, and troubleshooting checks. You can also browse our main Tohatsu collection. Scroll to the bottom of this page to start browsing parts for this engine, and on the collection page use the “Filter & Sort” controls to narrow results by horsepower, year range, and part category.

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How to Identify Your 105HP Model

Nameplate location: Look on the transom/clamp bracket or swivel bracket for the model and serial plate. Record the full model code and serial number.
Model code and suffix: Suffix letters typically indicate shaft length (S/L/XL), start type (manual/electric), and control type (tiller/remote). A year or revision code may be included.
2‑Stroke specifics: Confirm whether your engine uses pre‑mix fuel or an oil‑injection system (on‑engine oil tank and pump). This affects service steps and parts.
Platform clues: Mid‑range Tohatsu 2‑strokes around this rating may share components with nearby horsepower models (e.g., 90/115). Count carburetors and note gearcase style to help confirm parts compatibility.

Platform Overview

Mid‑Range 2‑Stroke Platform

Feature	Description
Configuration	Inline mid‑range 2‑stroke, carbureted; typically 3–4 cylinders depending on generation.
Common Models	105HP 2‑Stroke models in the same family as select 90–115HP Tohatsu units. Verify by full model code.
Advantages	Light weight, strong hole‑shot, straightforward service with widely available maintenance parts.
Notes	Many service items overlap with adjacent horsepower models of the same era. Confirm shaft length, controls, gear ratio, and oil‑injection vs. pre‑mix before ordering.

Routine Maintenance & Service Parts

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

Item	Interval*	Remarks	Parts Link
Gear oil (lower unit)	Every 100 hours or annually	Inspect for water intrusion (milky oil). Replace seals if leaks are found.	Tohatsu Lower Unit Seal Kits
Spark plugs	Inspect 50 hours; replace ~100 hours or as needed	Check gap and color; replace if fouled or worn.	Spark plug
Fuel filter (inline/under‑cowl)	Every 100 hours or annually	Replace more often if using ethanol fuel or in dusty environments.	Fuel Filters
Water pump impeller / kit	Every 2 seasons or 200 hours (inspect annually)	Critical for cooling; replace sooner if telltale is weak or after sand/silt use.	Tohatsu Water Pump Repair Kits
Anodes (internal & external)	Inspect every 50 hours; replace when 50% consumed	Use alloy matched to your water (salt, brackish, fresh). Keep paint off anodes.	Anodes
2‑Stroke oil system (injection or pre‑mix)	Pre‑use checks each trip; full inspection annually	Injection: inspect tank, lines, and pump output. Pre‑mix: verify correct oil ratio and fresh fuel.	Tohatsu Outboard Parts
Propeller & hardware	Inspect each outing; remove/grease hub seasonally	Check for dings, fishing line on shaft, and worn hub. Verify nut and cotter pin.	Propellers

Frequently Used Parts Categories

Routine Service: Tohatsu Outboard Parts
Cooling System: Tohatsu Water Pump Repair Kits
Lower Unit / Seals: Tohatsu Lower Unit Seal Kits
Ignition / Electrical: Electrical Items
Fuel System: Fuel Filters
Propellers & Hardware: Propellers
Corrosion Protection: Anodes

Common Symptoms & Quick Checks

Symptom	Check First	Related Parts
Weak telltale or overheat alarm	Inspect water‑intake screens for debris; verify impeller condition; confirm thermostat operation.	Water pump repair kit, thermostat, intake screen/gasket.
Poor acceleration or loss of power	Check prop damage/slip, fuel quality, clogged filter, and fouled spark plugs; verify throttle linkage and timing advance.	Propeller, fuel filter, spark plugs, carburetor components.
Hard starting / rough idle	Drain stale fuel; verify choke/enricher; inspect primer bulb and fuel lines for air leaks; test battery and starter performance.	Fuel filter, hoses/primer bulb, spark plugs, starter, carburetor jets/needles.
Excessive smoke (2‑stroke)	Confirm correct oil ratio; inspect oil‑injection pump output and stuck choke; ensure thermostat closes properly for correct warm‑up.	Spark plugs, oil lines/pump, thermostat.
Gearcase noise or metal in gear oil	Verify oil level/condition; check for water ingress; inspect prop shaft and carrier for fishing line damage to seals.	Lower unit seal kit, bearings, shims.

FAQs

Are parts interchangeable between different years or platforms?

Some service parts (impellers, plugs, filters, anodes) cross over among mid‑range Tohatsu 2‑strokes. However, differences in year, shaft length, controls, and gear ratio can change part numbers. Use your full model and serial to confirm.

When should I replace the impeller?

As a rule of thumb, replace every two seasons or about 200 hours, and sooner if you notice a weak telltale, have run in sand/silt, or after an overheat. The full pump kit is recommended when housings or wear plates show scoring.

How often should I change lower unit gear oil?

Change at least annually or every 100 hours. If the oil looks milky or has metal debris, service immediately and inspect/replace seals before further use.

What information helps confirm part compatibility?

Provide the complete model code, serial number, shaft length (S/L/XL), control type (tiller/remote), and whether the engine is pre‑mix or oil‑injected. Photos of the nameplate and the part area also help.

Ready to find parts by horsepower, year, and model? Browse our main Tohatsu collection and use the Filter & Sort tools 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.