Honda Marine 4-Stroke 8HP Outboard Engine Parts

(20 products)

This page focuses on Honda Marine 4-Stroke 8HP outboard engines. Use it to find compatible parts and quick service guidance. Below you’ll find maintenance tips, common replacement parts, and troubleshooting checks. You can also browse the main Honda collection any time. 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 narrow results by horsepower, year range, and part category/section.

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How to Identify Your 8HP Model

Nameplate location: Look for the model/serial tag on the transom bracket or swivel bracket area; it includes the model (e.g., BF8A, BF8D, BFP8D) and frame/serial number.
Reading the code: The base model (BF8) is followed by a series letter (A/D). Suffix letters indicate shaft length (S=15", L=20", X=25"), and certain packages include electric start or remote control.
Platform clues: 4‑stroke, 2‑cylinder carbureted engines were produced across multiple revisions. High‑thrust versions are labeled BFP8D and use a different gear ratio and propeller style.
Year confirmation: Use the full frame/serial number from the tag to match parts accurately; production ranges vary by year and configuration.

Platform Overview

BF8A (late 1990s–mid 2000s)

Feature	Description
Configuration	2‑cylinder, carbureted 4‑stroke; manual or electric start; tiller or remote; 15/20/25" shafts
Common Models	BF8A family (examples: BF8AX, BF8AY) spanning multiple year/serial ranges
Advantages	Light weight, quiet operation, good fuel economy, simple service procedures
Notes	Some cooling, ignition, and gearcase parts vary by shaft length and serial number; verify with the nameplate before ordering.

BF8D / BFP8D (early 2000s and newer)

Feature	Description
Configuration	2‑cylinder, carbureted 4‑stroke, with variants for tiller/remote and electric start; BFP8D = high‑thrust gearcase/prop
Common Models	BF8D series (e.g., D1–D6, DK0–DK3); High‑thrust BFP8D series (e.g., D1–D6)
Advantages	Refined manners, strong low‑speed control; high‑thrust models improve push on heavier boats and sailboats
Notes	Propellers, gear ratio, and some cooling/gearcase items differ between BF8D and BFP8D. Match parts to your exact model and frame/serial.

Routine Maintenance & Service Parts

Intervals below are typical guidelines for small 4‑stroke outboards. Always follow the schedule and procedures in your official Honda service manual.

Item	Interval*	Remarks	Parts Link
Engine oil & filter	100 hours or annually	Use NMMA FC‑W oil; replace filter if equipped; check level after first hour	Oil Filters
Gear oil (lower unit)	100 hours or annually	Inspect for water/metal; renew sealing washers; reseal if contamination persists	Honda Lower Unit Seal Kits
Spark plugs	100 hours or annually	Check gap and insulator color; replace if fouled or worn	Spark plug
Fuel filter / water separator	100 hours or each season	Replace more often with ethanol or if debris/water present	Fuel Filters
Water pump impeller / kit	2 seasons or 200 hours (inspect annually)	Essential for cooling; replace sooner after sand/silt use or weak telltale	Honda Water Pump Repair Kits
Anodes (zincs)	Inspect every 3 months; replace when 50% depleted	Use the correct alloy for fresh/brackish/salt water	Anodes
Propeller & hardware	Inspect each trip; remove seasonally	Check for dings, fishing line, and correct cotter/nut torque	Propellers

*Intervals are general references; consult your Honda service manual for exact procedures and specifications.

Frequently Used Parts Categories

Routine Service — Service & Maintenance Kits
Cooling System — Honda Water Pump Repair Kits
Fuel System — Fuel Filters
Ignition / Electrical — Electrical Items
Lower Unit / Sealing — Honda Lower Unit Seal Kits
Propulsion — Propellers
Corrosion Protection — Anodes

Common Symptoms & Quick Checks

Symptom	Check First	Related Parts
Weak telltale / overheat alarm	Inspect intake screens for debris; verify strong water stream; assess impeller and thermostat	Water pump kit, thermostat, intake screen, anodes
Hard starting / rough idle	Fresh fuel, correct choke/enrichment; check plugs and idle circuit; look for stale/ethanol‑related varnish	Spark plugs, fuel filter, carburetor service parts
Poor acceleration / power loss	Verify prop condition/pitch; check for fuel restriction and compression; confirm throttle opens fully	Propeller, fuel filter, plugs, air/fuel components
Gearcase noise or milky gear oil	Drain oil and inspect for metal/water; pressure test; check seals and shaft surfaces	Lower unit seal kit, bearings, sealing washers

FAQs

Are parts interchangeable between BF8A, BF8D, and BFP8D?

Many maintenance items are similar, but critical components (gearcase, propellers, some cooling and ignition parts) can differ by platform, shaft length, and frame/serial range. Use your full model code and serial to confirm fit.

When should the impeller be replaced?

Inspect annually and replace every 2 seasons or ~200 hours—sooner after sand/silt exposure or if the telltale stream weakens. Replace the full pump kit if wear is evident.

How often should gear oil be changed?

Typically every 100 hours or annually. Always check for water or metal on the drain plug magnet; persistent contamination warrants seal inspection and reseal.

What information helps verify part compatibility?

Provide the exact model (e.g., BF8A, BF8D, BFP8D), full frame/serial number, shaft length (S/L/X), control type (tiller/remote), and any factory options (electric start, high thrust). A clear photo of the nameplate is ideal.

Ready to find parts? Browse the main Honda collection and narrow by horsepower, year, and model. Use “Filter & Sort” to quickly drill into the categories you need.

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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.