Honda 105HP 4-Stroke Marine Outboard Engine Parts

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This page is for Honda 4‑Stroke 105HP outboard engines. It helps you find compatible parts and service information, including maintenance tips, common replacement parts, and troubleshooting guidance. You can also browse our main Honda 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 105HP Model

Locate the identification plate on the transom bracket or swivel bracket; it lists the model code and serial number.
Read the full model code and suffix – these indicate shaft length (S/L/X), control type (tiller or remote), and revision level.
For mid‑range Honda 4‑stroke models, many components are shared across the 75–100 hp family; always confirm by serial number for exact impeller, thermostat, and prop hub fit.
Note rigging details such as mechanical remote controls vs. tiller, and verify gearcase ratio when selecting propellers.

Engine / Platform Overview

Mid‑Range Inline‑4 EFI 4‑Stroke (approx. 75–105 hp)

Feature	Description
Configuration	Inline‑4, EFI, 4‑stroke outboard
Common Models	Examples include Honda BF75, BF90, and BF100 (specs vary by revision and market)
Advantages	Smooth operation, strong mid‑range torque, and good fuel economy
Notes	Water pump kits, anodes, and propellers can vary by gearcase and model suffix. Confirm full model code and serial number for exact fit.

Routine Maintenance & Service Parts

Intervals below are general guidelines for Honda 4‑stroke outboards. Always follow the official service manual for your exact model and operating conditions.

Item	Interval*	Remarks	Parts Link
Engine oil + filter	First 20 hours, then every 100 hours or annually	Use FC‑W marine oil; replace the filter and crush washer where applicable	Oil Filters
Gear oil (lower unit)	Every 100 hours or annually	Inspect for milky oil or metal debris; address seals if contamination is found	Honda Lower Unit Seal Kits
Spark plugs	Inspect every 100 hours; replace at 200–300 hours or as needed	Verify plug type and gap for your specific model	Spark Plugs
Fuel filter / water separator	Every 100 hours or each season	Replace more frequently if using ethanol fuel or if contamination is suspected	Fuel Filters
Water pump impeller / kit	Every 2–3 seasons or 200–300 hours	Replace sooner after overheat events or sandy/silty operation	Honda Water Pump Repair Kits
Anodes (sacrificial)	Inspect monthly; replace when ~50% consumed	Match alloy to your water type (fresh, brackish, or salt)	Anodes

Frequently Used Parts Categories

Routine Service: Service & Maintenance Kits
Cooling System: Honda Water Pump Repair Kits
Fuel System: Fuel Filters
Ignition / Electrical: Electrical Items
Propellers & Hubs: Propellers
Gearcase Seals & Hardware: Honda Lower Unit Seal Kits
Corrosion Protection: Anodes

Common Symptoms & Quick Checks

Symptom	Check First	Related Parts
Weak tell‑tale or overheat alarm	Inspect intake screens, verify impeller condition, and test thermostat	Water pump kit, thermostat, intake screen, anodes
Hard starting or rough idle	Check fuel quality, primer bulb, and filters; inspect spark plugs and plug caps	Fuel filter, primer bulb, spark plugs, ignition leads
Poor acceleration or power loss	Look for damaged or fouled prop, restricted fuel flow, or throttle travel issues	Propeller, fuel filter, fuel pumps, spark plugs
Gearcase noise or metal in gear oil	Verify oil level/condition; check for fishing line on the prop shaft that may have damaged seals	Lower unit seal kit, bearings, prop shaft hardware

FAQs

Are parts interchangeable between different years or platforms?

Some service items are shared within the mid‑range Honda family, but changes between revisions and model years are common. Always confirm by full model code and serial number before ordering.

When should the water pump impeller be replaced?

As a preventive measure every 2–3 seasons or 200–300 hours. Replace sooner if the tell‑tale weakens, you operate in sand or silt, or after any overheat event.

How often should the gear oil be changed?

Every 100 hours or annually. If oil appears milky or contains metal debris, address seal issues or internal wear before further use.

What information do you need to confirm part compatibility?

Please provide the full model code, serial number, horsepower, shaft length, and control type (tiller or remote). Photos of the nameplate and the existing part help ensure an exact match.

Ready to find the right components? Browse the main Honda collection 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.