Honda Marine 4-Stroke 115HP Outboard Engine Parts

(35 products)

This page is dedicated to Honda Marine 4-Stroke 115HP outboard engines. Use it to find compatible parts and service guidance, including maintenance tips, frequently replaced components, and quick troubleshooting checks. You can also browse the main Honda collection for broader coverage. Scroll to the bottom of the page to start browsing parts for this engine, and remember that on the collection page you can use the Filter & Sort controls to narrow results by horsepower, year range, and part category/section.

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How to Identify Your 115HP Model

Locate the identification plate on the transom bracket or swivel bracket. It lists the model designation and serial/VIN.
Decode the model and suffix: letters typically indicate shaft length (L ≈ 20 in, X ≈ 25 in) and control/feature variations. Always confirm with the serial/VIN plate.
Common BF115 model families include earlier “A/AX/AY/AK0” and later “D/J/JK1/DK1” series. Many parts are shared, but key service items (impellers, thermostats, sensors) may differ between generations.
All BF115 are 4-stroke EFI inline‑4 platforms. If unsure which version you have, compare your exact suffix against the plate and parts diagrams before ordering.

Platform Overview

BF115 A/AX/AY/AK0 Platform (earlier generation)

Feature	Description
Configuration	Inline‑4 EFI 4‑stroke, DOHC, electronically controlled fuel injection (PGM‑FI)
Common Models	Examples: BF115AX LA/XA/XCA; BF115A1–A6 variants; BF115AK0 LA/XA
Advantages	Refined running, good fuel economy, widely supported service parts
Notes	Verify impeller/thermostat revisions by serial. Suffix letters indicate shaft length and configuration; match exactly for best parts compatibility.

BF115 D/J/DK1/JK1 Platform (later generation)

Feature	Description
Configuration	Inline‑4 EFI 4‑stroke with updated ECM/calibration; emphasis on mid‑range response and efficiency
Common Models	Examples: BF115D LA/XA/XCA; BF115J LDA/LRA/XDA/XRA; BF115DK1 LA/XA/XCA; BF115JK1 LDA/LRA/XDA/XRA
Advantages	Improved charging and drivability; broad parts availability; strong corrosion protection features
Notes	Some service parts interchange with earlier series, but sensors, pumps, and cooling components can be generation‑specific. Confirm by model suffix and serial/VIN.

Routine Maintenance & Service Parts

Intervals below are general guidelines for Honda 4‑stroke outboards. Always follow your official service manual for the most accurate procedures and schedules for your exact model/suffix.

Item	Interval*	Remarks	Parts Link
Engine oil & filter	Every 100 hours or annually	Use FC‑W rated oil and the correct filter for your suffix; replace drain washers as needed	Oil Filters
Gear oil (lower unit)	Every 100 hours or annually	Inspect magnetic drain plug; check for water intrusion; replace seals if contamination is found	Honda Lower Unit Seal Kits
Spark plugs	Inspect at 100 hours; replace 200 hours or as needed	Check gap and replace as a set for smooth idle and performance	Spark Plugs
Fuel filter / water‑separating filter	100–200 hours or each season	Replace more frequently with ethanol fuel or contaminated supply	Fuel Filters
Water pump impeller / kit	Every 2 seasons or 200 hours (sooner in sandy/silty water)	Restore cooling performance and protect against overheat events	Honda Water Pump Repair Kits
Anodes (engine & gearcase)	Inspect monthly; replace when 50% consumed	Use alloy appropriate for your water (aluminum, zinc, or magnesium)	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 and Starters
Corrosion Protection – Anodes
Propulsion – Propellers
Gearcase Sealing – Honda Lower Unit Seal Kits

Common Symptoms & Quick Checks

Symptom	Check First	Related Parts
Weak tell‑tale stream or overheat alarm	Inspect intake screens for debris; verify impeller condition; check thermostat operation	Water pump kit, thermostat, intake screen
Poor acceleration or power loss	Check prop damage/pitch, fuel quality, and fuel filters; inspect spark plugs	Propeller, fuel filter, spark plugs
Hard starting or rough idle	Confirm battery voltage and connections; prime fuel system; check for vacuum leaks and fouled plugs	Starter, spark plugs, fuel filter, sensors
Gearcase noise or metal in gear oil	Verify oil level/condition; look for water intrusion; pressure test and reseal as needed	Lower unit seal kit, bearings, drain plug gaskets

FAQs

Are parts interchangeable between different BF115 series (A vs D/J, etc.)?

Some components are shared, but cooling, fuel, and electrical parts can be generation‑specific. Always match parts to the full model suffix and serial/VIN on your nameplate.

When should I replace the water pump impeller?

As a preventative measure, replace every 2 seasons or ~200 hours. Shorten the interval if you run in sandy, silty, or shallow environments, or if the tell‑tale weakens.

How often should I change lower unit gear oil?

Change at least every 100 hours or annually. Inspect for milky oil (water contamination) and metal on the magnetic plug; reseal the gearcase if contamination is present.

What information helps confirm part compatibility?

Please provide the complete model code and suffix, serial/VIN, shaft length (L or X), and any relevant control details. A clear photo of the nameplate and the part needing replacement is ideal.

Ready to find parts? Browse the Honda outboard 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.