Yamaha 105HP 4-Stroke Outboard Marine Engine Parts

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This page is dedicated to Yamaha 4-Stroke 105HP outboard engines. Use it to find compatible parts and service information, including maintenance intervals, common replacement parts, and troubleshooting tips. You can also browse the main Yamaha collection. 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 refine by horsepower, year range, and part category.

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How to Identify Your 105HP Model

Locate the nameplate/serial label on the transom bracket or clamp bracket. It lists the model code, production code, and serial number.
Read the model code: the leading letter(s) identify series (e.g., F = 4‑stroke), the number is horsepower, and trailing letters/numbers indicate features like trim/tilt and production year.
Suffix letters commonly denote shaft length (S=15", L=20", X=25") and control type (H=tiller, R=remote). Trim/tilt variants often include T.
For 4‑stroke models, look for oil fill/cap and an engine cover label noting “F” series. Verify whether your engine aligns with the mid‑range inline‑4 platform common to 100–115 HP.

Engine / Platform Overview

Inline‑4 EFI 4‑Stroke (mid‑range 100–115 HP family)

Feature	Description
Configuration	Inline‑4 4‑stroke with EFI; designed for efficient mid‑range torque and quiet operation.
Common Models	Examples within this family include F100 and F115 series. 105 HP variants typically share many components with these platforms (verify by model code).
Advantages	Good fuel economy, low noise/vibration, reliable mid‑range performance.
Notes	Match parts by full model code and suffix. Propellers depend on spline/gear ratio; lower unit and cooling system parts often interchange within the series but confirm shaft length and control type.

Routine Maintenance & Service Parts

Intervals below are general guidelines for typical Yamaha 4‑stroke mid‑range outboards. Always follow the exact procedures and intervals in your official service manual.

Item	Interval*	Remarks	Parts Link
Engine oil + filter	100 hours or annually	Use marine FC‑W oil; replace drain washer; check for leaks after first run.	Yamaha Service & Maintenance Kits
Gear oil (lower unit)	100 hours or annually	Inspect magnetic drain plug; milky oil indicates water intrusion—service seals.	Yamaha Lower Unit Seal Kits
Spark plugs	100 hours or annually	Check gap and insulator color; replace if fouled or worn.	Spark Plugs
Fuel filter (inline/under‑cowl)	100 hours or annually	Drain water separators frequently; replace filters to protect injectors.	Fuel Filters
Water pump impeller/kit	Every 2 years or 200 hours (inspect annually)	Replace sooner if weak tell‑tale, overheating, or sandy/silty use.	Yamaha Water Pump Repair Kits
Anodes (internal/external)	Inspect every 50 hours; replace when 50% consumed	Choose alloy for your water (aluminum for most, zinc for salt, magnesium for fresh).	Yamaha Anodes
Thermostat inspection/replacement	Every 2 years or as needed	Replace if stuck or corrosion is present to maintain proper operating temp.	Yamaha Outboard Parts

*Intervals may vary by usage and environment. Follow the Yamaha service manual for your exact model code.

Frequently Used Parts Categories

Routine Service — Yamaha Service & Maintenance Kits
Cooling System — Yamaha Water Pump Repair Kits
Fuel System — Fuel Filters
Ignition & Starting — Yamaha Starters
Corrosion Protection — Yamaha Anodes
Propulsion — Yamaha Propellers
Lower Unit Seals & Gaskets — Yamaha Lower Unit Seal Kits

Common Symptoms & Quick Checks

Symptom	Check First	Related Parts
Weak tell‑tale / overheat alarm	Inspect intake screens for blockage; verify strong water stream and thermostat operation.	Water pump repair kit, thermostat, intake screen, gaskets
Poor acceleration / power loss	Check prop condition and WOT RPM; inspect spark plugs and fuel filters for restriction.	Propeller, spark plugs, fuel filters, injectors
Hard starting / rough idle	Verify battery health and connections; inspect primer bulb, air leaks, and idle air passages.	Spark plugs, fuel filters, injectors, starter, ignition switch
Gearcase noise / metal in gear oil	Check oil level/condition; look for fishing line at prop shaft; perform pressure/vacuum test if water is present.	Lower unit seal kit, gear oil, bearings, thrust washer

FAQs

Are parts interchangeable between different years or platforms?

Many wear items (impellers, anodes, some filters) are shared within the mid‑range inline‑4 family, but interchange depends on your exact model code and suffix (shaft length, control type, year). Always match by full model identification.

When should I replace the water pump impeller?

As a preventative measure, replace every 2 years or 200 hours—sooner if operating in sand/silt or if the tell‑tale weakens, temperatures rise, or the impeller shows set or cracking.

How often should the gear oil be changed?

At least annually or every 100 hours. If you find milky oil, service the seals immediately and re‑test after a short run.

What information do you need to confirm part compatibility?

Please provide the complete model code, serial number, horsepower and stroke type (Yamaha 4‑Stroke 105HP), shaft length, control type (tiller/remote), and approximate year. Photos of the nameplate and the part needing replacement are very helpful.

Ready to find parts for your Yamaha outboard? Browse the main Yamaha collection by horsepower, year, and model to zero in on the correct components.

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If you’re unsure about your model, send us a clear photo of the nameplate and the part you need and we’ll help verify compatibility.