Tohatsu 2-Stroke 8HP Outboard Engine Parts

(18 products)

This page supports Tohatsu 2‑Stroke 8 HP outboard engines and helps you find compatible parts and service information. Below you’ll find maintenance tips, frequently used replacement parts, and troubleshooting guidance. 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/section.

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How to Identify Your 8 HP Model

Locate the nameplate/serial label on the transom bracket or swivel bracket. Record the full model code and serial number.
Model codes for these 2‑stroke engines commonly look like M8 followed by letters (e.g., M8B). Suffixes typically indicate shaft length (short/long), tiller vs remote control, and manual vs electric start.
Confirm it is a 2‑Stroke model (premix fuel/oil or oil‑injection) to avoid ordering 4‑stroke parts by mistake.
Note any features such as tiller handle vs remote control or electric start; these options can change cables, harnesses, and starter parts.

Engine Overview

Tohatsu 8 HP 2‑Stroke Platform

Feature	Description
Configuration	Inline‑2, carbureted 2‑stroke outboard; manual or electric start; tiller or remote variants.
Common Models	Examples include M8B and similar 8 HP 2‑stroke model codes.
Advantages	Light weight, simple maintenance, strong low‑speed thrust for dinghies, inflatables, and small skiffs.
Notes	Some parts vary by start type, shaft length, and control setup. Always match parts using the exact model code and serial number.

Routine Maintenance & Service Parts

Intervals below are general guidelines; always follow the procedures and schedules in your official service manual.

Item	Interval*	Remarks	Parts Link
Gear oil (lower unit)	Every 100 hours or annually	Change sooner if water intrusion is suspected; inspect drain plug magnet for metal.	Tohatsu Lower Unit Seal Kits
Spark plugs	100 hours or annually	Inspect and gap; replace if fouled, worn, or if misfire persists.	Tohatsu Outboard Parts
Fuel filter / in‑line filter	100 hours or each season	Replace to prevent lean running and hard starts.	Fuel Filters
Water pump impeller / kit	Every 2 seasons or ~200 hours (annually in sandy/silty water)	Restores cooling flow and protects against overheating.	Tohatsu Water Pump Repair Kits
Anodes (internal & external)	Inspect every 50–100 hours; replace at ~50% depletion	Essential corrosion protection in salt and brackish water.	Anodes
2‑Stroke fuel/oil mix or oil‑injection check	Verify before every outing	Use the ratio specified on the engine/owner’s manual (commonly 50:1) or service the oil‑injection system as applicable.	Tohatsu Outboard Parts

Frequently Used Parts Categories

Routine Service — Service & Maintenance Kits
Cooling System — Tohatsu Water Pump Repair Kits
Gearcase Seals — Tohatsu Lower Unit Seal Kits
Fuel System — Fuel Filters
Ignition / Electrical — Electrical Items
Carburetion — Carburetor
Corrosion Protection — Anodes

Common Symptoms & Quick Checks

Symptom	Check First	Related Parts
Weak tell‑tale stream or overheat alarm	Inspect intake screens, water pump impeller, housing/plate, and thermostat.	Water pump kit, thermostat, gaskets, intake screen.
Poor acceleration or power loss	Check fuel quality, in‑line filter, carburetor jets, and prop condition; verify reed valves seal properly.	Fuel filter, carburetor rebuild kit, spark plugs, propeller.
Hard starting or rough idle	Confirm choke/enrichment operation, spark plug condition/gap, and idle mixture settings.	Spark plugs, carburetor kit, primer bulb/lines.
Excessive smoke (2‑stroke)	Verify premix ratio or oil‑injection setting; ensure engine reaches proper operating temperature.	Spark plugs, carb adjustments, thermostat.
Gearcase noise or metal in gear oil	Check oil level/condition and for water intrusion; inspect prop shaft and seals after impact.	Lower unit seal kit, gear oil, prop shaft seal, thrust washer.

FAQs

Are parts interchangeable across different years or 8 HP platforms?

Some service items may carry over, but variations in model suffix, shaft length, start type, and control configuration affect part fit. Always verify using the exact model code and serial number before ordering.

When should I replace the water pump impeller?

As preventive maintenance, replace every 2 seasons or ~200 hours (annually for harsh/sandy conditions), or immediately if the tell‑tale stream is weak or the engine overheats.

How often should I change lower unit gear oil?

Every 100 hours or annually, and after any suspected impact, submersion, or water intrusion. Inspect the drain plug magnet for metal during each change.

What information do you need to confirm part compatibility?

Please provide the full model code (e.g., M8B), serial number, shaft length, start type (manual/electric), control type (tiller/remote), and a clear photo of the nameplate. Photos of the part being replaced also help.

Ready to find parts for your Tohatsu 2‑Stroke 8 HP outboard? Browse our main Tohatsu collection and filter by horsepower, year, and model.

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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.