Welcome Aboard!

10% savings across all ranges sitewide for new customers · Terms apply

FLASHSALE26

Honda Marine 4-Stroke 70-90HP Outboard Engine Parts

(2 products)

This page is dedicated to Honda 4‑Stroke 70–90HP outboard engines. Use it to locate compatible parts and service information, including maintenance tips, common replacement items, and troubleshooting guidance. You can also browse the main Honda collection at 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.

Browse All Honda Parts

How to Identify Your 70–90HP Model

  • Locate the serial/nameplate on the starboard clamp bracket or swivel bracket; it lists the model code (e.g., BF90…) and the engine’s serial/VIN.
  • Read the model suffix: letters typically indicate shaft length (S/L/X), control type (tiller/remote), and trim/tilt; they can also mark year or sub‑series. Match your exact suffix when selecting parts.
  • Platform clues: BF90 A‑series are commonly carbureted; later D‑series (e.g., DK0–DK5) are EFI. BF70 models use a smaller inline‑4 platform. These differences affect fuel, ignition and cooling components.
  • Serial/VIN prefixes and ranges (e.g., codes like BBBL or BBCJ seen on OEM catalogs) help pinpoint the correct sub‑model for exact parts compatibility.

Platform Overview

BF75/BF90 A‑Series (Carbureted)

Feature Description
Configuration Inline‑4 4‑stroke, carbureted induction
Common Models BF90A1–A6 and related AT/AW/AX/AY variants (match exact suffix)
Advantages Robust, simple fueling; widely supported service parts
Notes Many routine parts are shared with BF75; carburetor jets/needles and ignition items can vary by year/suffix—verify by serial range.

BF90 D‑Series (EFI/PGM‑FI)

Feature Description
Configuration Inline‑4 4‑stroke with EFI (PGM‑FI)
Common Models BF90DK0–DK5 (match LRTA/JRTA/XRTA and similar suffixes)
Advantages Improved fuel economy, better cold starts, reduced maintenance vs carb
Notes Fuel and intake components (filters, injectors, IAC) differ from A‑series; always select parts by full model code and serial/VIN.

BF70 (Inline‑4 Platform)

Feature Description
Configuration Inline‑4 4‑stroke, typically EFI
Common Models BF70 4‑stroke models (verify exact suffix and serial)
Advantages Lightweight, efficient mid‑range performance for smaller rigs
Notes Service parts are not always shared with BF75/90; match by model code and serial/VIN.

Routine Maintenance & Service Parts

Intervals below are general guidelines for Honda 4‑stroke outboards. Always follow the procedures and schedules in your official service manual for your exact model and serial range.

Item Interval* Remarks Parts Link
Engine oil + filter First 20 hrs, then every 100 hrs or annually Use NMMA FC‑W oil grade specified by Honda; replace crush washer Shop Oil Filters
Gear oil (lower unit) Every 100 hrs or annually Inspect for water/milky oil; replace seals if contamination is found Honda Outboard Parts
Spark plugs Inspect every 100 hrs; replace as needed Gap to spec; replace sooner if fouled or misfire occurs Shop Spark Plugs
Fuel filter / water separator Every 100 hrs or annually Replace in‑line and/or under‑cowl filters; drain separator regularly Shop Fuel Filters
Water pump impeller/kit Every 2–3 seasons or 200 hrs Replace sooner after sand/silt use or weak tell‑tale Honda Water Pump Repair Kits
Anodes (internal & external) Inspect every 50 hrs; replace when 50% depleted Use correct material for your water (aluminum, zinc, or magnesium) Shop Anodes
Thermostat Inspect every 1–2 years Replace if stuck, corroded, or causing overheat/slow warm‑up Honda Outboard Parts
Lower unit seal kit (if water intrusion) As needed Replace shaft and prop seals after fishing line damage or leak Honda Lower Unit Seal Kits

Frequently Used Parts Categories

Common Symptoms & Quick Checks

Symptom Check First Related Parts
Weak tell‑tale / overheat alarm Inspect intake screens, tell‑tale hose, and impeller wear; verify thermostat operation Water pump kit, thermostat, intake screen, grommets
Hard starting / rough idle Check fuel freshness, battery voltage, spark plug condition; replace/clean fuel filters; for carb models, clean idle circuits Spark plugs, fuel filter, carb service parts (A‑series), EFI/IAC cleaning (D‑series)
Poor acceleration / power loss Inspect prop for damage or hub slip; look for fuel restriction and air leaks; run compression test if needed Propeller, fuel filters, fuel line/primer, ignition components
Gearcase noise or metal in gear oil Drain gear oil and inspect; check for water intrusion; verify prop‑shaft seals and fishing line damage Lower unit seal kit, bearings, shims, gear oil

FAQs

Are parts interchangeable between different years or platforms?

Some routine items may interchange within the same family (e.g., many BF75/BF90 A‑series parts), but EFI D‑series and BF70 platforms use different fuel and electrical components. Always confirm by full model code, suffix, and serial/VIN.

When should the water pump impeller be replaced?

As a rule of thumb, every 2–3 seasons or ~200 hours, and sooner if you notice a weak water stream, overheating, or operation in sandy/silty water.

How often should the lower unit gear oil be changed?

Change at least annually or every 100 hours. If the oil appears milky or contaminated, address seal leaks and service immediately.

What information do I need to confirm part compatibility?

Provide the full model code (e.g., BF90 with suffix), the serial/VIN from the nameplate, shaft length, and key options (tiller/remote). Photos of the nameplate and the part area help ensure an exact match.

Ready to find parts by horsepower, year, and model? Browse the main Honda outboard collection and use Filter & Sort to dial in the exact components for your engine.

Browse Honda Outboard Parts

If you’re unsure about your model, send us a clear photo of the nameplate and the part you need and we’ll help verify compatibility.
View as
Back to top

Compare /5