Yanmar 4-Stroke 24HP Marine Engine Parts

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This page is dedicated to Yanmar 4-Stroke 24HP outboard engines. Use it to find compatible parts and practical service information. Below you’ll find maintenance tips, common replacement parts, and troubleshooting guidance. You can also browse our main Yanmar collection. Scroll down to the bottom of this page to start browsing parts for this engine. On collection pages, use the Filter & Sort controls to narrow results by horsepower, year range, and part category.

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How to Identify Your 24HP Model

Locate the nameplate/serial plate on the clamp bracket or swivel bracket. It typically shows the model code, serial number, and production details.
Read the model suffix: it often indicates shaft length (S/L/XL), control type (tiller vs. remote), and minor year or revision codes.
Confirm 4-stroke indicators such as an engine oil dipstick and filler cap; these help distinguish 4-stroke from older 2-stroke units.
Note any intake or cowling differences that separate carbureted vs. EFI variants; this can affect fuel system and electrical parts selection.

Engine Overview

24–25 HP Class 4‑Stroke Outboard

Feature	Description
Configuration	Typically inline 2–3 cylinder, 4-stroke, carbureted or EFI depending on year; manual or electric start; tiller or remote control.
Common Models	Examples in the 24–25 HP class with short/long shaft variants; verify exact model code and suffix on the serial plate before ordering.
Advantages	Quiet operation, good fuel economy, reliable low‑to‑mid‑range torque for small craft and tenders.
Notes	Some parts differ by shaft length, control style, and fuel system (carb vs. EFI). Always match parts to your exact model and serial number.

Routine Maintenance & Service Parts

Intervals below are general guidelines for 4‑stroke outboards. Always follow your specific service manual for procedures and torque specs.

Item	Interval*	Remarks	Parts Link
Engine oil + filter	First 20 hrs, then every 100 hrs or annually	Warm engine before draining; replace crush washer if applicable; confirm oil grade.	Yanmar Oil filters
Gear oil (lower unit)	Every 100 hrs or annually	Inspect for water intrusion (milky oil) and metal debris; replace seals if needed.	Lower Unit Seal Kits
Spark plugs	Inspect every 100 hrs; replace as needed	Check gap and color; replace if fouled, worn, or out of spec.	Spark plug
Fuel filter / water-separating filter	Every 100 hrs or annually	Drain/replace sooner if contaminated fuel is suspected.	Yanmar Fuel filters
Water pump impeller / kit	Every 2 seasons or 200 hrs (whichever comes first)	Replace sooner if weak tell‑tale or overheat alarm occurs; inspect housing and key.	Water Pump Impeller Rebuild Kits
Anodes (internal/external)	Inspect every 50 hrs; replace when 50% consumed	Match anode material to water type (salt/brackish/fresh) and keep mounting surfaces clean.	Anodes

*Intervals are general guidelines; consult your model’s service schedule for exact requirements.

Frequently Used Parts Categories

Routine Service: Yanmar Service & Maintenance Kits
Cooling System: Water pumps and Impellers
Fuel System: Fuel filters and Fuel Pumps
Ignition / Electrical: Electrical Items and Rectifiers
Corrosion Protection: Anodes
Propulsion: Propellers and Propeller Guards
Gearcase Sealing: Lower Unit Seal Kits

Common Symptoms & Quick Checks

Symptom	Check First	Related Parts
Weak tell‑tale or overheat alarm	Inspect intake screen for blockage, verify pump prime, check impeller condition and thermostat.	Water pump impeller kit, thermostat, intake screen, gaskets
Poor acceleration or power loss	Check prop for damage/cavitation, inspect spark plugs, replace fuel filter, confirm clean fuel and proper venting.	Propeller, spark plugs, fuel filter, fuel pump
Hard starting or rough idle	Verify fresh fuel, inspect/replace plugs, check idle air passages and for vacuum leaks; on EFI, confirm battery health.	Spark plugs, fuel filter, gaskets, electrical/charging components
Gearcase noise or metal in gear oil	Drain lube and inspect; pressure/vacuum test gearcase; check for seal damage and bearing wear.	Lower unit seal kit, shims/seals, bearings
Battery not charging	Test battery voltage, inspect connections/grounds, check rectifier‑regulator output.	Rectifier/regulator, electrical connectors, wiring

FAQs

Are parts interchangeable between different years or platforms?

Some components interchange, but many items differ by model code, fuel system (carb vs. EFI), and shaft length. Always match parts to the exact model and serial number on your nameplate.

When should the impeller be replaced?

As a preventive measure, replace the impeller every 2 seasons or ~200 hours, and sooner if you see a weak tell‑tale, overheat warnings, or sand/silt usage.

How often should I change gear oil?

Change lower unit gear oil every 100 hours or annually. If water contamination (milky oil) or metal debris is present, diagnose and reseal the gearcase before further use.

What information do you need to confirm part compatibility?

Please provide the full model code, serial number, shaft length, control type, and any visible carb/EFI identifiers. Photos of the nameplate and the part needing replacement are very helpful.

Ready to find the right components? Browse the main Yanmar collection and use Filter & Sort 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.