Yamaha 4-Stroke 115-350HP Outboard Engine Parts

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This page focuses on Yamaha 4-Stroke 115–350HP outboard engines and helps you find compatible parts and key service information. Below you’ll find maintenance tips, commonly replaced parts, and troubleshooting guidance. You can also browse the main Yamaha collection for a wider selection. Tip: scroll to the bottom of this page to start browsing parts for this engine range, and on the collection page use the “Filter & Sort” controls to narrow results by horsepower, year range, and part category/section.

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How to Identify Your 115–350HP Model

Nameplate location: Find the model/serial plate on the transom bracket or clamp area on the port side of the outboard.
Model code basics: Yamaha four-strokes typically start with “F” (e.g., F250). Suffix letters/numbers indicate shaft length (S=15", L=20", X=25", U=30"), rotation (L for counter-rotation), and control type (R=remote, H=tiller).
Year code: Many older model codes end with a letter that corresponds to a year code (e.g., A=2002, B=2003, C=2004, etc.). Always confirm with your serial number and manual.
Platform cues: 115–200HP often appear as inline-4 engines; 200–300HP are commonly V6; 350HP is V8. Cylinder count, cowl badging, and overall size can help distinguish platforms.

Platform Overview

Inline-4 (Typical for F115/F150/F175/F200 I-4)

Feature	Description
Configuration	Inline-4 EFI four-stroke, commonly 1.8–2.8L
Common Models	F115, F150, F175, F200 (Inline-4 variants). Example designations only—verify by model plate.
Advantages	Good fuel economy and weight, straightforward service access, reliable mid-range torque.
Notes	Many routine-service parts are shared within the I-4 family; gearcase, controls, and some cooling parts vary by shaft length and rotation.

V6 (Typical for F200/F225/F250/F300)

Feature	Description
Configuration	60° V6 EFI four-stroke, commonly 3.3–4.2L
Common Models	F200, F225, F250, F300 (V6). Example designations only—confirm generation (3.3L vs 4.2L).
Advantages	High torque and strong charging output for offshore and heavy loads.
Notes	Parts can differ by engine generation and control system (mechanical vs digital). Verify with model code and serial.

V8 (Typical for F350)

Feature	Description
Configuration	V8 EFI four-stroke, approx. 5.3L
Common Models	F350/F350A. Example designations—verify by exact model/serial.
Advantages	Maximum thrust for multi-engine and heavy offshore rigs.
Notes	Unique gearcase and many model-specific parts; confirm rotation, shaft length, and control type.

Routine Maintenance & Service Parts

Intervals below are general guidelines for four-stroke Yamaha outboards; always follow the procedures and schedules in your specific service manual.

Item	Interval*	Remarks	Parts Link
Engine oil + filter	Every 100 hours or annually	Use FC-W marine oil and the filter grade specified by your model.	Yamaha Service & Maintenance Kits
Gear oil (lower unit)	Every 100 hours or annually	Inspect for water contamination; change sooner after impacts or submersion.	Yamaha Service & Maintenance Kits
Spark plugs	Inspect annually; replace 100–300 hours	Gap and heat range per manual; replace sooner if fouled.	Spark Plugs
Fuel filter(s)	Every 100 hours or annually	Replace engine-mounted filter; drain/replace water-separating filter as needed.	Fuel Filters
Water pump impeller/kit	Every 200 hours or 2 seasons	Replace sooner after overheating, sandy/silty use, or weak tell-tale.	Yamaha Water Pump Repair Kits
Anodes	Inspect every 50 hours/3 months	Replace when 50% eroded; choose material to match your water (aluminum/brackish, magnesium/fresh, zinc/salt).	Yamaha Anodes
Propeller and hub inspection	Check each season	Inspect blades for damage and fishing line behind prop; verify hub integrity.	Yamaha Propellers
Thermostats	Every 2–3 years	Replace if running cold or frequent overheat alarms.	Yamaha Outboard Parts

*Intervals are general guidance—always confirm for your exact model and operating conditions.

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
Propellers & Driveline: Yamaha Propellers
Corrosion Protection: Yamaha Anodes
Gearcase Sealing: Yamaha Lower Unit Seal Kits

Common Symptoms & Quick Checks

Symptom	Check First	Related Parts
Weak tell‑tale stream or overheat alarm	Inspect intake screens, impeller condition, thermostat operation; confirm correct water pick-up depth.	Water pump repair kit, wear plate/housing, thermostat, intake screen, anodes.
Poor acceleration or power loss	Check fuel quality, water-separating and engine filters, prop damage/pitch, and WOT RPM.	Fuel filters, spark plugs, propeller/hub, fuel injector service.
Hard starting or rough idle	Verify battery voltage and connections, primer bulb integrity, vacuum leaks, and plug condition.	Spark plugs, fuel filter, fuel pump, hoses/clamps.
Gearcase noise or metal in gear oil	Check gear oil for water/metal, prop shaft seals for fishing line damage, and correct oil level.	Lower unit seal kit, bearings, gear oil drain/vent plug gaskets.

FAQs

Are parts interchangeable between different years or platforms?

Some service parts interchange within a family (e.g., Inline-4) and year range, but V6/V8 components often differ from I-4. Always confirm by model code, serial number, and control/shaft/rotation details before ordering.

When should the impeller be replaced?

As a rule of thumb, every 200 hours or about every two seasons. Replace sooner if you notice weak water flow, overheating, or if the motor has seen sandy/silty conditions or debris ingestion.

How often should gear oil be changed?

Typically every 100 hours or annually. Change immediately after a hard impact or suspected water intrusion. Always install new drain/vent plug gaskets during service.

What information do I need to confirm part compatibility?

Have the full model code, serial number, horsepower, shaft length, rotation, and control type. Photos of the nameplate and the part you’re replacing are also very helpful.

Ready to find parts by horsepower, year, and model? Browse our Yamaha collection and use Filter & Sort to narrow results for your engine.

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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.