Honda Marine 15HP 4-Stroke Outboard Engine

(22 products)

This page is for Honda Marine 4‑Stroke 15 HP outboard engines. Use it to find compatible parts and 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 results by horsepower, year range, and part category/section.

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How to Identify Your 15 HP Model

Find the model/serial plate on the transom bracket or swivel bracket. It lists the model (e.g., BF15 or BFP15), serial number, and other build details.
Model code and suffixes identify shaft length and options: S ≈ 15 in, L ≈ 20 in, X ≈ 25 in; look for tiller vs. remote control designations.
Standard vs. Power Thrust: BF15 is the standard model; BFP15 (Power Thrust) uses a different gearcase/prop setup for added low‑speed thrust.
These are carbureted 4‑stroke, 2‑cylinder engines. Confirm the serial number to match ignition, charging, and carburetor components correctly across years.

Engine Overview

Honda BF15 / BFP15 Inline‑Twin 4‑Stroke

Feature	Description
Configuration	Inline‑2, carbureted 4‑stroke; approx. 350 cc (≈21 cu in) displacement; manual or electric start; common shaft options S/L/X.
Common Models	BF15 (S/L/X) standard; BFP15 (Power Thrust) variants.
Advantages	Light weight for its class, smooth mid‑range torque, frugal fuel use, and useful charging output on equipped versions.
Notes	Many filters, ignition, and service parts interchange across years; Power Thrust models use different prop/gearcase components. Confirm model and serial for carburetor jets and charging parts.

Routine Maintenance & Service Parts

Intervals below are general guidelines for Honda 4‑stroke 15 HP outboards. Always follow the official service manual for your exact model and operating conditions.

Item	Interval*	Remarks	Parts Link
Engine oil + oil filter	Every 100 hrs or annually (earlier at break‑in)	Use marine‑rated 4‑stroke oil (e.g., FC‑W 10W‑30). Warm engine before draining; replace filter with each oil change.	Oil Filters
Gear oil (lower unit)	Every 100 hrs or annually	Inspect for water/milkiness and metal. Replace drain plug gaskets; use marine GL‑5 gear lube.	Honda Lower Unit Seal Kits
Spark plugs	Inspect 100 hrs; replace 200–300 hrs or 2–3 seasons	Check gap and replace if fouled or worn; use plugs meeting OEM spec.	Spark Plugs
Fuel filter / in‑line filter	Every 100 hrs or annually	Drain/replace if contaminated with water or debris; keep a spare on board.	Fuel Filters
Water pump impeller/kit	Every 200 hrs or 2–3 seasons	Replace sooner after sand/silt use or weak tell‑tale. Consider full kit (impeller, wear plate, gaskets).	Honda Water Pump Repair Kits
Anodes (external/internal)	Inspect 50 hrs; replace when ≥50% depleted	Match anode type (aluminum, zinc, magnesium) to your water—salt, brackish, or fresh.	Anodes

Frequently Used Parts Categories

All Honda outboard parts and accessories: Honda Outboard Parts
Cooling system service: Honda Water Pump Repair Kits
Gearcase sealing and maintenance: Honda Lower Unit Seal Kits
Fuel system filtration: Fuel Filters
Ignition tune‑up: Spark Plugs
Propulsion and performance: Propellers
Corrosion protection: Anodes
Carburetor components: Carburetor

Common Symptoms & Quick Checks

Symptom	Check First	Related Parts
Weak tell‑tale or overheat alarm	Inspect intake screens, thermostat, and water pump impeller; verify hose routing and debris build‑up.	Water pump kit, thermostat, intake screen
Hard starting / rough idle	Prime the bulb; drain stale fuel; check idle mixture and pilot jet cleanliness; inspect plugs and plug caps.	Fuel filter, carburetor components/jets, spark plugs
Poor acceleration / power loss	Check prop condition/pitch, compression balance, and fuel delivery; confirm correct prop for BF15 vs. BFP15.	Propeller, fuel filter, spark plugs
Gearcase noise or metal in gear oil	Verify oil level/condition; inspect prop shaft for fishing line; pressure test seals if water intrusion suspected.	Lower unit seal kit, drain plug gaskets, bearings
No/low battery charging (on equipped models)	Check fuse/connection, rectifier‑regulator output, and stator coil; confirm flywheel magnet condition.	Rectifier/regulator, stator, wiring connectors

FAQs

Are BF15 and BFP15 parts interchangeable?

Most routine‑service parts (filters, plugs, anodes, many ignition items) are shared. Power Thrust (BFP15) models use different propellers and some gearcase components. Always verify with the full model code and serial number.

When should I replace the impeller?

As a rule, replace every 2–3 seasons or ~200 hours. In sandy, silty, or shallow use, inspect more often and replace sooner if the tell‑tale weakens or overheating occurs.

How often should gear oil be changed?

Change at least annually or every 100 hours. If water or metal is found, service seals and re‑test before returning to service.

What information do you need to confirm part compatibility?

Please provide the full model code (BF15 or BFP15), serial number, shaft length (S/L/X), starting type, and control type (tiller/remote). A photo of the nameplate and the current part helps ensure a perfect match.

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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.