Honda Marine 145HP 4-Stroke Outboard Engine Parts

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This page is for Honda Marine 4-Stroke 145HP outboard engines. It helps you find compatible parts and service information, including maintenance tips, common replacement parts, and troubleshooting guidance. You can also browse our main Honda collection. 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.

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How to Identify Your 145HP Model

Nameplate location: Look on the transom bracket (often starboard side) or swivel bracket for the model and serial plate. Record the full model code and serial number.
Read the model code: Honda 4-stroke mid/high-power models commonly use BF prefixes (e.g., BF135/140/150). Suffix letters/numbers indicate shaft length (S/L/X), control type (tiller vs. remote), and series revisions.
Platform clues: 145HP-class Honda 4-strokes align with inline-4 EFI platforms. Note cowling shape, intake layout, and rigging (mechanical vs. iST) to distinguish variations.
Confirm year/fitment: Always verify parts by full model code and serial number—many items changed across series updates even at similar horsepower.

Engine Overview

Inline-4 EFI 4‑Stroke Platform (145HP class)

Feature	Description
Configuration	Inline-4, fuel-injected 4-stroke with modern ignition and corrosion protection features
Common Models	Examples in this band include BF135/BF140/BF150 families; verify exact series by model code and serial
Advantages	Strong mid-range torque, smooth running, and good fuel economy with broad propeller options
Notes	Rigging and some cooling/fuel components vary by series revision and control system; confirm gearcase ratio and prop hub type before ordering

Routine Maintenance & Service Parts

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

Item	Interval*	Remarks	Parts Link
Engine oil + filter	First 20 hours, then every 100 hours or annually	Use FC‑W marine oil; replace drain plug washer where applicable	Oil Filters
Gear oil (lower unit)	Every 100 hours or annually	Check for water intrusion (milky oil) and metal debris; service seals if leakage is found	Honda Lower Unit Seal Kits
Spark plugs	Inspect every 100 hours; replace 200–300 hours or as needed	Gap and plug type vary by model; replace sooner for extended trolling or fouling	Spark Plug
Fuel filter / water separator	Every 100 hours or each season	Drain/replace more frequently with ethanol fuel or contamination	Fuel Filters
Water pump impeller / kit	Every 2–3 seasons or 200–300 hours	Replace sooner if weak tell‑tale, overheating, or sand/silt operation	Honda Water Pump Repair Kits
Anodes (sacrificial)	Inspect monthly; replace when ~50% consumed	Choose alloy for your water type: fresh, brackish, or salt	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
Propulsion – Propellers
Gearcase & Seals – Honda Lower Unit Seal Kits
Corrosion Protection – Anodes

Common Symptoms & Quick Checks

Symptom	Check First	Related Parts
Weak tell‑tale or overheat alarm	Inspect intake screens, verify impeller condition, and test thermostat	Water pump kit, thermostat, intake screen, anodes
Hard starting or rough idle	Check fuel quality, primer bulb, and filters; inspect spark plugs and plug caps	Fuel filter, spark plugs, primer bulb, ignition leads
Poor acceleration or power loss	Check for damaged/fouled propeller, fuel restriction, dirty plugs; confirm throttle opening	Propeller, fuel filter, spark plugs
Gearcase noise or metal in gear oil	Verify oil level/condition; inspect for fishing line on prop shaft that could damage seals	Lower unit seal kit, bearings, prop shaft hardware

FAQs

Are parts interchangeable between different years or platforms?

Some consumables may be shared within a family, but many parts differ across series updates and platforms. Always verify by full model code and serial number.

When should the impeller be replaced?

As preventive maintenance every 2–3 seasons or 200–300 hours, and sooner if the tell‑tale weakens, you operate in sand/silt, or the engine has overheated.

How often should gear oil be changed?

Every 100 hours or annually. If gear oil appears milky or contains metal, address seal or internal wear issues before further operation.

What information do you need to confirm part compatibility?

Please provide the full model code, serial number, horsepower, shaft length, and control type (tiller or remote). A clear photo of the nameplate and the part helps confirm fit.

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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.