Mitsubishi 4-Stroke 2.4HP Outboard Marine Engine Parts

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This page supports Mitsubishi 4-Stroke 2.4HP outboard engines. Use it to identify compatible replacement parts and service information, including maintenance tips, common replacement items, and troubleshooting guidance. You can also browse our main Mitsubishi parts categories. Scroll to the bottom of this page to start browsing parts for this engine, and on any 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 2.4HP Model

Nameplate/serial plate is typically on the transom clamp bracket or swivel bracket; it lists the model code and serial number.
Model code suffixes often indicate shaft length (S = short, L = long), start method (manual/electric), and tiller/remote options.
For 4-stroke portables, look for an engine oil fill cap/dipstick and (if equipped) a small external oil filter; these confirm 4-stroke configuration.
Cooling: portable outboards are water‑cooled and should show a steady telltale stream. This helps confirm the correct water pump/impeller parts.

Engine/Platform Overview

Small Portable 4‑Stroke (around 2–3 HP)

Feature	Description
Configuration	Single‑cylinder, carbureted 4‑stroke, manual (recoil) start, tiller steering, water‑cooled.
Common Models	Mitsubishi 2.4HP 4‑stroke portable outboard variants (short/long shaft, manual start).
Advantages	Lightweight, quiet operation, low fuel consumption, straightforward maintenance.
Notes	Match parts by model and serial number. Water pump and gearcase seals are model‑specific; service intervals vary by use (salt vs. fresh water).

Routine Maintenance & Service Parts

Intervals below are general guidelines for small 4‑stroke outboards. Always follow the procedures and schedules in your official service manual for your exact model.

Item	Interval*	Remarks	Parts Link
Engine oil + filter (if equipped)	First 20 hours, then every 100 hours or annually	Use marine 4‑stroke oil; some small models do not have an external oil filter.	Oil Filters
Gear oil (lower unit)	Every 100 hours or annually	Check for water intrusion (milky oil) and metal debris; renew seals if contaminated.	Lower Unit Seal Kits
Spark plug	Inspect every 50 hours; replace 100 hours or as needed	Verify correct heat range and gap for your model; replace if fouled or worn.	Spark Plugs
Fuel filter / inline strainer	Every 100 hours or annually	Replace if contaminated; drain carburetor for storage to prevent varnish.	Fuel Filters
Water pump impeller / kit	Every 2–3 seasons (sooner in sandy/silty water)	Weak telltale or overheat alarm indicates service due.	Water Pump Impeller Kits
Anodes (sacrificial)	Inspect every service; replace at ~50% depletion	Use alloy suited to your water (zinc, aluminum, or magnesium).	Anodes
Propeller & shear pin	Inspect frequently	Carry a spare shear pin; replace damaged props to prevent vibration.	Propellers

*Intervals may vary by usage, environment, and model year. Always confirm with your service manual.

Frequently Used Parts Categories

Routine Service: Service & Maintenance Kits
Cooling System: Water Pumps
Fuel System: Fuel Filters
Ignition / Electrical: Electrical Items and Spark Plugs
Propulsion: Propellers
Sealing & Gearcase: Lower Unit Seal Kits
Corrosion Protection: Anodes

Common Symptoms & Quick Checks

Symptom	Check First	Related Parts
Weak telltale or overheat alarm	Inspect water intake for blockage; verify impeller condition; confirm thermostat operation.	Water pump impeller kit, thermostat, intake screen
Hard starting / rough idle	Use fresh fuel; check choke/enrichment; inspect/replace spark plug; clean carburetor.	Spark plug, fuel filter, carburetor components
Poor acceleration / power loss	Check propeller damage or wrong pitch; inspect fuel filter; verify throttle linkage and compression.	Propeller, fuel filter, carburetor jets
Gearcase noise or metal flakes in gear oil	Drain gear oil to inspect; pressure/vacuum test for seal leaks.	Lower unit seal kit, bearings, shims
Excessive vibration / tiller shake	Inspect shear pin and prop blades; ensure prop nut/cotter is secure; check engine mounting bolts.	Propeller, shear pin, mounting hardware

FAQs

Are parts interchangeable between different years or platforms?

Some routine items (spark plugs, anodes, fuel line components) may cross between years, but water pump parts, gaskets, and gearcase components are often model‑specific. Always match by model code and serial number.

When should the impeller be replaced?

As a preventive measure, replace the impeller every 2–3 seasons, or immediately if the telltale becomes weak, the engine overheats, or the pump ingests sand/silt.

How often should I change the lower unit gear oil?

Every 100 hours or annually, and any time you suspect water intrusion or after a prop strike. Inspect magnetic drain plugs for metal debris.

What information do you need to confirm part compatibility?

Please provide the model code, serial number, shaft length (S/L), and a clear photo of the nameplate. Photos of the old part and any casting numbers also help verify the correct replacement.

Ready to find parts by category for your Mitsubishi portable outboard? Browse our service kits and core categories, then use Filter & Sort to narrow by horsepower, year, and part type.

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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.