Honda 350HP 4-Stroke Outboard Marine Engine Parts

(4 products)

This page is tailored for Honda 4-Stroke 350HP outboard engines. Use it to find compatible parts and practical service information. Below you’ll find maintenance tips, common replacement parts, and troubleshooting guidance. You can also browse the main Honda collection at any time. 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 350HP Model

Locate the identification/serial plate on the transom bracket (often port side) or the swivel bracket. Record the model code and serial number.
Honda model codes typically start with BF and horsepower (e.g., BF350A). Suffix letters indicate shaft length (L/XL/XXL), rotation (standard or counter), and control type.
Confirm stroke type: these engines are 4-stroke EFI models. If your cowling/label differs from 350HP or 4-stroke, recheck the plate.
When ordering parts, have the full model code and serial ready to verify year/serial breaks for exact-fit components.

Engine Platform Overview

Honda BF350 Family (V8 4‑Stroke EFI)

Feature	Description
Configuration	V8, 4-stroke, EFI; high-output 350 HP class engineered for offshore and heavy-load applications.
Common Models	Examples include BF350A variants with L/XL/XXL shafts and standard or counter-rotation options.
Advantages	Strong mid‑range torque, smooth NVH, and efficient cruising performance for larger boats and multi‑engine rigs.
Notes	Many service items are shared across the family, but always check serial breaks for changes in cooling, fuel, or ignition components.

Routine Maintenance & Service Parts

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

Item	Interval*	Remarks	Parts Link
Engine oil & filter	Every 100 hours or annually	Use marine-grade oil; replace crush washer; warm engine before draining.	Oil Filters
Gear oil (lower unit)	Every 100 hours or annually	Check for water intrusion (milky oil). Replace seals if contamination is present.	Honda Lower Unit Seal Kits
Spark plugs	Inspect 100 hours; replace 200–300 hours or as needed	Check gap and color; misfire under load often points to aged plugs.	Spark Plugs
Fuel filter / water-separating filter	Inspect every 50–100 hours; replace annually	Drain and check for water or debris; ethanol fuel may increase service frequency.	Fuel Filters
Water pump impeller / kit	Every 2 seasons or 200 hours (inspect annually)	Essential for cooling; replace sooner if run in sand/silt or after overheat.	Honda Water Pump Repair Kits
Anodes (zincs)	Inspect every 50 hours; replace when 50% eroded	Match anode material to your water (salt, brackish, fresh).	Anodes
Thermostat inspection	Check every 200 hours or 2 years	Stuck thermostats cause overheat or cold‑running; replace gasket on reassembly.	Honda Outboard Parts
Propeller & hub service	Inspect each outing; remove & grease spline seasonally	Check for dings, bent blades, or spun hub; verify pitch for load/boat.	Propellers

*Intervals are typical for recreational use; reduce intervals for commercial, high‑hour, or harsh environments.

Frequently Used Parts Categories

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

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 condition.	Water pump repair kit, thermostat, anodes
Poor acceleration / power loss	Look for fouled prop, wrong pitch, or damaged blades; check for clogged fuel filter and worn plugs.	Propeller, fuel filter, spark plugs
Hard starting / rough idle	Verify battery state and connections; prime fuel system; inspect plugs and water separator.	Spark plugs, fuel filter, starter
Gearcase noise or metal in gear oil	Check oil level/condition; inspect prop hub for impact damage; look for leaking prop‑shaft seals.	Lower unit seal kit, propeller

FAQs

Are parts interchangeable between different 350HP years or variants?

Many service items are shared, but cooling, fuel, and ignition components can change with serial breaks or rotation/shaft variants. Always confirm with the full model code and serial number.

When should I replace the water pump impeller?

Inspect annually and replace about every 2 seasons or 200 hours. In sandy or silty water, or after any overheat/low‑flow event, replace sooner.

How often should gear oil be changed?

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

What information is needed to confirm part compatibility?

Provide the complete model code (e.g., BF350A variant), serial number, shaft length, rotation (standard/counter), and any known year range. Photos of the nameplate help ensure an exact match.

Ready to find the exact-fit parts for your Honda outboard? Browse the main Honda 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.