Tohatsu 150HP 4-Stroke Outboard Engine Parts

(10 products)

This page is tailored for Tohatsu 4-Stroke 150 HP outboard engines. Use it to find compatible parts and key service information, including maintenance tips, common replacement items, and troubleshooting guidance. You can also browse our main Tohatsu collection for a wider selection. Tip: 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.

Browse All Tohatsu Parts

How to Identify Your 150 HP Model

Locate the identification plate on the transom bracket or swivel bracket. It lists the model code, serial number, and shaft length.
Read the model code and suffix: look for indicators of shaft length (L/XL), control type (remote/DBW), and regional or year suffixes.
Confirm it is a 4-stroke: presence of an engine oil dipstick and spin-on oil filter; there is no 2-stroke oil tank or premix requirement.
Note gauge/controls: some 150 HP models support analogue gauges or TOCS digital gauges; control box style influences harness/rigging parts.

Engine Overview

Inline-4 EFI 4‑Stroke (150 HP)

Feature	Description
Configuration	Four-cylinder inline, electronic fuel injection (EFI), 4-stroke outboard designed for high-power applications.
Common Models	150 HP 4‑stroke outboards offered in multiple shaft lengths (L/XL) and control options (mechanical or digital/remote).
Advantages	Strong mid‑range torque, good fuel economy, and low noise/vibration for cruising and offshore use.
Notes	Rigging may use analogue or TOCS digital gauges; verify your control box and harness type when ordering rigging or gauge parts. Cooling-system wear items (impeller, anodes) are routine service items on all variants.

Routine Maintenance & Service Parts

Intervals below are general guidelines for typical recreational use. Always follow the official service manual and local operating conditions.

Item	Interval*	Remarks	Parts Link
Engine oil + filter	100 hours or annually	Change oil and replace spin‑on filter; warm engine first for complete drain.	Oil Filters
Gear oil (lower unit)	100 hours or annually	Inspect for water or metal debris; reseal if leakage is found.	Tohatsu Lower Unit Seal Kits
Spark plugs	100–200 hours or annually	Inspect, clean, and gap; replace if fouled or worn.	Spark Plugs
Fuel filter / water separator	100 hours or annually	Replace more often with ethanol fuel or if storage is frequent.	Fuel Filters
Water pump impeller / kit	2 seasons or 200 hours (inspect annually)	Essential for cooling; replace sooner if stream is weak or you run sandy/shallow water.	Tohatsu Water Pump Repair Kits
Anodes (internal/external)	Inspect every 50 hours; replace as needed	Critical in brackish/saltwater; replace when 50% consumed.	Anodes

Frequently Used Parts Categories

Routine Service: Service & Maintenance Kits
Cooling System: Tohatsu Water Pump Repair Kits
Fuel System: Fuel Filters and Fuel Pumps
Ignition / Electrical: Electrical Items and Starters
Drivetrain / Gearcase: Tohatsu Lower Unit Seal Kits
Propulsion: Propellers
Corrosion Protection: Anodes

Common Symptoms & Quick Checks

Symptom	Check First	Related Parts
Weak tell‑tale stream or overheat alarm	Inspect intake screens for blockage, check impeller wear, and verify thermostat operation.	Water pump kit, thermostat, intake screens, anodes
Poor acceleration or power loss	Check fuel quality, replace filters, inspect prop for damage or wrong pitch, verify spark plug condition.	Fuel filter, fuel pump, spark plugs, propeller
Hard starting or rough idle	Confirm battery state, prime fuel system, inspect plugs and connectors for corrosion.	Spark plugs, starter, fuel filter, electrical connectors
Gearcase noise or metal in gear oil	Drain and inspect gear oil; look for milky oil (water intrusion); pressure/vacuum test for seal leaks.	Lower unit seal kit, bearings, prop shaft seals

FAQs

Are parts interchangeable across different years or platforms?

Some wear items are shared across multiple 150 HP 4‑stroke variants, but rigging, sensors, and gasket sets can differ by year, shaft length, and control/gauge type. Verify with your full model code and serial number before ordering.

When should I replace the water pump impeller?

Inspect annually and replace about every 2 seasons or 200 hours. Replace sooner if you see a weak tell‑tale stream, overheat warnings, or if the motor is used in sandy or shallow water.

How often should lower unit gear oil be changed?

Change gear oil every 100 hours or at least once per year. If the oil appears milky or you notice metal debris, stop operation and service seals and bearings before further use.

What information do you need to confirm part compatibility?

Please provide the full model code, serial number, shaft length (L/XL), and control/gauge type. Photos of the nameplate and the part you’re replacing are also helpful.

Ready to shop? Browse the main Tohatsu collection to filter by horsepower, year, and model, then refine with category filters to find the exact parts for your 150 HP.

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.