Yamaha 4-Stroke 147.5HP Marine Engine Parts

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This page is dedicated to Yamaha 4-Stroke 147.5HP outboard engines. Use it to quickly find compatible parts and key service information. Below you’ll find maintenance tips, common replacement parts, and troubleshooting guidance. You can also browse the main Yamaha collection. Scroll to the bottom of the 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.

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How to Identify Your 147.5HP Model

Locate the model/serial plate on the transom bracket or swivel bracket area; it includes the model code, shaft length, and serial number.
Read the model code: the prefix typically indicates 4‑stroke family, the number reflects horsepower, and suffix letters denote shaft length, control/tilt options, and a year code.
Confirm it’s 4‑Stroke: look for an engine oil dipstick/fill and a spin‑on oil filter. Two‑stroke models won’t have an engine oil filter.
Record the full model code and serial; many parts vary by year, shaft length, and regional spec.

Engine / Platform Overview

Inline‑4 EFI 4‑Stroke (147.5–150 HP class)

Feature	Description
Configuration	Inline‑4 gasoline, EFI fuel injection, 4‑stroke outboard with remote or tiller controls depending on variant.
Common Models	147.5–150 HP 4‑stroke Yamaha outboard models across multiple years and shaft lengths.
Advantages	Good fuel economy, strong mid‑range torque, broad parts availability, and straightforward routine service.
Notes	Verify exact model code and serial when ordering; parts such as gaskets, filters, anodes, and water pump kits can vary by year and shaft length.

Routine Maintenance & Service Parts

Intervals below are general guidelines for many Yamaha 4‑stroke 150‑class outboards. Always follow the service schedule and specifications in your official Yamaha manual.

Item	Interval*	Remarks	Parts Link
Engine oil + filter	Every 100 hours or annually	Use FC‑W marine oil; warm engine before draining; replace crush washer as required.	Oil Filters
Gear oil (lower unit)	Every 100 hours or annually	Inspect for water intrusion/metal; replace drain/vent gaskets; service seals if leaks are present.	Yamaha Lower Unit Seal Kits
Spark plugs	Inspect 100 hours; replace 200 hours or as needed	Check gap and color; replace sooner for hard starting or misfire.	Spark Plugs
Fuel filter / water separator	Every 100 hours or annually	Replace more often with ethanol fuel or contamination; prime and check for leaks.	Fuel Filters
Water pump impeller/kit	Every 2–3 seasons or 200 hours	Shorten interval for sandy/silty use or weak telltale; inspect wear plate and cup.	Yamaha Water Pump Repair Kits
Anodes (internal/external)	Inspect every 50 hours; replace as needed	Use alloy matched to water type (fresh/brackish/salt); keep paint off anodes.	Yamaha Anodes

*Intervals are typical for many Yamaha 4‑stroke outboards; confirm your model’s schedule in the official manual.

Frequently Used Parts Categories

Routine Service – Yamaha Service & Maintenance Kits
Cooling System – Yamaha Water Pump Repair Kits
Fuel System – Fuel Filters
Ignition / Electrical – Electrical Items
Propulsion – Yamaha Propellers
Seals & Gaskets – Yamaha Gaskets
Corrosion Protection – Yamaha Anodes

Common Symptoms & Quick Checks

Symptom	Check First	Related Parts
Weak telltale or overheat alarm	Inspect intake screens for debris, verify strong telltale, check impeller age and thermostat operation.	Water pump repair kit, thermostat, intake screens
Poor acceleration / power loss	Check for fouled plugs, clogged fuel filter, old fuel, and prop damage/hub slip.	Spark plugs, fuel filter, propeller
Hard starting / rough idle	Prime fuel system, verify battery condition and connectors, inspect plugs and air leaks on fuel lines.	Spark plugs, fuel filter, gaskets/hoses
Gearcase noise or metal in gear oil	Drain and inspect gear lube, check for water intrusion, examine prop shaft seals and fishing line damage.	Lower unit seal kit, bearings, prop shaft seals

FAQs

Are parts interchangeable between different years or platforms?

Some service items cross over, but many parts vary by year, shaft length, and regional spec. Always confirm your exact Yamaha model code and serial number before ordering.

When should the impeller be replaced?

As a rule of thumb, replace the impeller every 2–3 seasons or around 200 hours, and sooner if operating in sandy/silty water or if the telltale stream weakens.

How often should gear oil be changed?

Change lower unit gear oil every 100 hours or annually. Inspect for milky color (water) or metal debris and service seals if contamination is found.

What information do you need to confirm part compatibility?

Provide the full model code, serial number, shaft length, and any visible part numbers. A clear photo of the nameplate and the part in question helps ensure accuracy.

Ready to find parts for your Yamaha 147.5HP 4‑Stroke outboard? Browse the main Yamaha collection and 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.