Tohatsu 2-Stroke 45HP Outboard Marine Engine Parts

(5 products)

This page is for Tohatsu 2-Stroke 45HP outboard engines. Use it to find compatible parts and key service information, including maintenance schedules, commonly replaced items, and troubleshooting tips. You can also browse the main Tohatsu collection. Scroll to the bottom of this page to start browsing parts for this engine, and remember you can use the Filter & Sort controls on the collection page to narrow results by horsepower, year range, and part category.

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How to Identify Your 45HP Model

Locate the nameplate/serial tag on the transom bracket or swivel bracket (often starboard side). It lists model designation and serial number.
Read the model suffix letters: these typically indicate shaft length (S=15", L=20"), starting method (manual/electric), and control type (tiller/remote).
For 2-stroke variants, many 45HP models are closely related to 40/50HP families. Confirm features like oil injection vs. premix and ignition type before ordering parts.
Record the full model code and serial number to verify exact year/revision when selecting components like carburetor kits or gearcase seals.

Engine Overview

Typical 45HP 2‑Stroke Platform

Feature	Description
Configuration	Inline-3, carbureted 2-stroke with CDI ignition; premix (50:1) or oil-injected depending on model; tiller or remote control options.
Common Models	45HP two-stroke variants commonly share architecture with the 40/50HP family from the same generation.
Advantages	Light weight, simple design, strong hole shot, easy dockside service.
Notes	Many wear parts (impeller, anodes, gearcase seals) cross over with 40/50HP siblings. Always match by model/serial and shaft length.

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	Inspect for water (milky oil). Replace sealing washers each change.	Tohatsu Outboard Parts
Spark plugs	Inspect every 100 hours; replace as needed	Check gap and heat range per manual; replace if fouled or worn.	Spark Plugs
Fuel filter / inline strainer	Every season or 100 hours	Replace more often if poor fuel quality or storage issues are suspected.	Fuel Filters
Water pump impeller / kit	Every 2 seasons or 200 hours	Service annually if operating in sand/silt or if tell‑tale is weak.	Tohatsu Water Pump Repair Kits
Anodes (external/internal)	Inspect every 50 hours; replace at ~50% wear	Choose alloy for your water (zinc: salt, aluminum: brackish, magnesium: fresh).	Anodes
Lower unit seal kit	As needed (if water intrusion is found)	Rebuild when gear oil shows water or leaks at prop shaft/drive shaft seals.	Tohatsu Lower Unit Seal Kits
Oil injection system (if equipped)	Inspect/bleed annually	Check pump operation, lines, and filters; use NMMA TC‑W3 oil.	Hoses
Premix ratio (non‑injection models)	Every fill‑up	Maintain 50:1 with quality TC‑W3 2‑stroke oil; verify owner’s manual for your model.	Tohatsu Outboard Parts
Thermostat	Every 2 years or as needed	Replace if stuck open (cold running, excess smoke) or stuck closed (overheat).	Tohatsu Outboard Parts

Frequently Used Parts Categories

Routine Service — Tohatsu Outboard Parts
Cooling System — Tohatsu Water Pump Repair Kits
Gearcase & Seals — Tohatsu Lower Unit Seal Kits
Fuel System — Fuel Filters
Ignition / Electrical — Electrical Items
Propellers — Propellers
Prop Protection — Propeller Guards

Common Symptoms & Quick Checks

Symptom	Check First	Related Parts
Weak tell‑tale stream or overheat alarm	Inspect intake screens and tell‑tale for blockage; verify impeller and thermostat condition.	Water pump kit, thermostat, grommets, intake screen
Poor acceleration or loss of power	Check fuel quality, filters, and carburetor jets; inspect propeller for damage or over‑pitching.	Fuel filter, carburetor repair kit, spark plugs, propeller
Hard starting / rough idle	Verify choke/enrichment operation; check spark plug gap; look for air leaks in fuel lines.	Spark plugs, primer bulb/hoses, carburetor kit
Excessive smoke (2‑stroke)	Confirm correct premix ratio or oil pump setting; ensure thermostat allows proper warm‑up.	Oil pump/lines, thermostat, spark plugs, reed service
Gearcase noise or metal in gear oil	Drain and inspect oil; check for water intrusion and prop shaft seal damage.	Gear oil, lower unit seal kit, bearings

FAQs

Are parts interchangeable between different years or related 40/50HP platforms?

Many wear items are shared within the same family, but revisions, shaft length, and equipment (tiller/remote, electric start, oil injection) can change part fit. Always confirm using your full model code and serial number.

When should I replace the impeller?

As a rule of thumb, every 2 seasons or about 200 hours. Replace sooner if you operate in sand or silt, see a weak tell‑tale stream, or experience overheat warnings.

How often should the lower unit gear oil be changed?

Change at least once per year or every 100 hours. If the engine is submerged or the oil appears milky, service immediately and inspect/replace seals.

What information do you need to confirm part compatibility?

Provide the full model code, serial number, shaft length (S/L), control type (tiller or remote), starting method, and a clear photo of the nameplate. Photos of the part you’re replacing also help.

Ready to find parts for your Tohatsu 2‑Stroke 45HP? Browse the main Tohatsu collection and use the filters to narrow 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.