Honda Marine 4-Stroke 115-350HP Outboard Engine Parts

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This page is for Honda 4‑Stroke 115–350HP outboard engines. Use it to find compatible parts and practical service information, including maintenance tips, common replacement parts, and troubleshooting guidance. You can also browse the 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 by horsepower, year range, and part category/section.

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How to Identify Your 115–350HP Model

Locate the nameplate/serial plate on the stern bracket or swivel bracket. It lists the model code, serial number, and often shaft length.
Read the full model code (e.g., BF115, BF150, BF225, BF250, BF300, BF350A). Suffixes typically indicate shaft length (L/XL/XXL) and rotation (standard or counter).
Confirm rotation and controls: counter‑rotation lowers are common on twin rigs; note remote vs. tiller (where applicable) and any digital/drive‑by‑wire controls on newer engines.
Different platforms exist across this range (Inline‑4, V6, and V8). Serial number and variant help ensure the correct cooling, fuel, and ignition parts.

Engine Platform Overview

Inline‑4 EFI (115–150 HP)

Feature	Description
Configuration	Inline‑4, 4‑stroke, EFI; balanced weight and strong efficiency for single‑engine installations.
Common Models	BF115, BF135, BF150 variants (L/XL shafts; standard rotation most common).
Advantages	Refined operation, good fuel economy, and easy service access for routine maintenance.
Notes	Many service items are shared across variants; verify serial breaks for changes in fuel filtration, sensors, or cooling components.

V6 EFI (200–300 HP)

Feature	Description
Configuration	V6, 4‑stroke, EFI; popular for heavier boats and multi‑engine setups.
Common Models	BF200, BF225, BF250, BF300 with L/XL/XXL shafts and standard/counter‑rotation options.
Advantages	Strong mid‑range torque, robust charging systems, and dependable cruising performance.
Notes	Check gear ratio and rotation before ordering propellers or gearcase parts; confirm serial number for thermostat and water pump revisions.

V8 EFI (350 HP Class)

Feature	Description
Configuration	V8, 4‑stroke, EFI; high‑output 350 HP class designed for offshore and heavy‑load duty.
Common Models	BF350A family with L/XL/XXL shafts and standard or counter‑rotation lower units.
Advantages	Excellent mid‑range pull, smooth NVH characteristics, and efficient cruise for larger hulls.
Notes	Many service parts are shared within the family; always check serial breaks for cooling, fuel, or ignition changes before ordering.

Routine Maintenance & Service Parts

Intervals below are general guidelines for recreational use. Always follow the official Honda service manual and adjust for duty cycle and environment.

Item	Interval*	Remarks	Parts Link
Engine oil & filter	Every 100 hours or annually	Warm engine before draining; replace crush washer; use marine‑grade oil.	Oil Filters
Gear oil (lower unit)	Every 100 hours or annually	Inspect for water intrusion (milky oil). Service seals if contamination is present.	Honda Lower Unit Seal Kits
Spark plugs	Inspect at 100 hours; replace 200–300 hours or as needed	Verify correct gap and heat range; misfire under load often indicates aged plugs.	Spark Plugs
Fuel filter / water‑separating filter	Inspect 50–100 hours; replace annually	Drain and check for water/debris; ethanol fuel may require shorter intervals.	Fuel Filters
Water pump impeller / kit	Every 2 seasons or ~200 hours (inspect annually)	Critical for cooling; replace sooner after overheat/low‑flow events or sandy use.	Honda Water Pump Repair Kits
Anodes (zincs)	Inspect every 50 hours; replace at ~50% erosion	Match anode material to water type (salt, brackish, fresh) to reduce corrosion.	Anodes
Thermostat inspection	Every 200 hours or 2 years	Replace if sticking or if temperature control is unstable; renew gasket on reassembly.	Honda Outboard Parts
Propeller & hub service	Inspect each outing; remove & grease splines seasonally	Check for bent blades or a spun hub; verify pitch for hull/load.	Propellers

Frequently Used Parts Categories

Routine Service Kits – Service & Maintenance Kits
Cooling System – Honda Water Pump Repair Kits
Gearcase Seals – Honda Lower Unit Seal Kits
Fuel System – Fuel Filters
Ignition / Electrical – Electrical Items
Propellers & Hubs – Propellers
Boat Accessories – Boat Accessories

Common Symptoms & Quick Checks

Symptom	Check First	Related Parts
Weak tell‑tale stream / overheat alarm	Inspect intake screens for debris; verify tell‑tale hose is clear; check impeller and thermostat.	Water pump repair kit, thermostat, anodes
Poor acceleration / power loss	Check propeller for damage or wrong pitch; inspect fuel filter and spark plugs; verify clean hull/gear.	Propeller, fuel filter, spark plugs
Hard starting / rough idle	Confirm battery state and cable connections; prime fuel system; inspect plugs and water‑separating filter.	Spark plugs, fuel filter, starter
Gearcase noise or metal in gear oil	Check gear oil level/condition; inspect prop hub for impact damage; look for leaking prop‑shaft seals.	Lower unit seal kit, propeller

FAQs

Are parts interchangeable across different years or platforms?

Some service items are shared, but key components can vary between Inline‑4, V6, and V8 engines and by serial break. Always confirm the full model code, serial number, shaft length, and rotation before ordering.

When should the impeller be replaced?

Inspect annually and replace about every two seasons or ~200 hours. In sandy/silty water or after any overheat or low‑flow event, replace sooner.

How often should the gear oil be changed?

At least every 100 hours or annually. If the oil appears milky or contaminated, service immediately and inspect seals for leaks.

What information do you need to confirm part compatibility?

Provide the complete model code (e.g., BF350A variant), serial number, shaft length (L/XL/XXL), rotation (standard/counter), and any known year range. A clear photo of the nameplate helps ensure an exact match.

Ready to find exact‑fit parts? Browse the main Honda collection and filter 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.