Yamaha 140HP 2-Stroke Outboard Engine Parts

(20 products)

This page is dedicated to Yamaha 2‑Stroke 140HP outboard engines. Use it to find compatible parts and service information, including maintenance tips, common replacement items, and troubleshooting guidance. You can also browse our main Yamaha outboard collection. Scroll to the bottom of this page to start browsing parts for this engine. 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 140HP Model

Nameplate/serial plate: Typically on the transom bracket (port side) or swivel bracket under the cowling. The number is also stamped on a powerhead “freeze plug.”
Reading the model code: Yamaha 2‑stroke codes bundle series and options (e.g., an example like 140AETO). Letters often denote electric start, power trim & tilt, remote control, and shaft length; a year code/suffix may follow.
Platform clues: Most 140HP 2‑stroke Yamahas are V4, oil‑injected, carbureted models common in the mid/late 1980s (e.g., 140A series). Look for four carburetors and an oil injection tank/system.
Shaft length and controls: Verify L/XL shaft length and remote vs. tiller control to ensure propeller and gearcase parts match.

Platform Overview

Yamaha 140HP 2‑Stroke V4

Feature	Description
Configuration	90° V4, carbureted 2‑stroke with oil injection (remote oil tank), mechanical fuel system.
Common Models	Examples include 140A series such as 140AETO (circa 1987) and similar remote‑control, power trim & tilt variants.
Advantages	Strong mid‑range torque, relatively light for the output, straightforward carb and ignition service.
Notes	Use TC‑W3‑certified 2‑stroke oil. Many wear parts align with Yamaha V4 115/130/140 families from similar years; always confirm by model code/serial. Match prop shaft length and gearcase style before ordering.

Routine Maintenance & Service Parts

Intervals below are general guidelines; always follow your official Yamaha service manual for exact procedures and schedules.

Item	Interval*	Remarks	Parts Link
Gear oil (lower unit)	Every 100 hours or annually	Check for water intrusion/metal on magnet; replace seals if milky oil is found.	Yamaha Service & Maintenance Kits
Spark plugs (set of 4)	100 hours or annually	Inspect color/fouling; gap to spec; replace as a set.	Spark Plugs
Fuel filters (inline or water‑separating)	Inspect 50 hours; replace annually	Keep water and debris out of carbs; replace sooner if contamination is suspected.	Fuel Filters
Water pump impeller/kit	100 hours or every 1–2 seasons	Critical for cooling; replace more often in sandy/silty water.	Yamaha Water Pump Repair Kits
Anodes (internal & external)	Inspect 50 hours; replace at ~50% wear	Choose alloy for your water (aluminum for most, zinc for salt, magnesium for fresh where appropriate).	Yamaha Anodes
Thermostat	Every 2–3 seasons or as needed	Replace if stuck open (cold running/smoke) or stuck closed (overheat).	Yamaha Outboard Parts
Oil injection system check	Annually; hoses 5–7 years	Verify pump index, bleed lines, replace brittle hoses/filters; use TC‑W3 oil.	Yamaha Outboard Parts
Propeller & hub	Inspect each season	Remove to check for fishing line; verify pitch for proper WOT RPM.	Yamaha Propellers

Frequently Used Parts Categories

Routine Service Kits — Yamaha Service & Maintenance Kits
Cooling System — Yamaha Water Pump Repair Kits
Gearcase Seals — Yamaha Lower Unit Seal Kits
Propellers & Hardware — Yamaha Propellers
Ignition & Starting — Yamaha Starters
Gaskets & Oil Seals — Yamaha Oil Seals
Corrosion Protection — Yamaha Anodes

Common Symptoms & Quick Checks

Symptom	Check First	Related Parts
Weak tell‑tale stream / overheat alarm	Inspect intake screens for blockage, verify impeller condition, test thermostat operation.	Water pump kit, thermostat, intake screen, anodes.
Poor acceleration / power loss	Check prop for damage/slip, inspect plugs and plug caps, verify clean fuel and filters; consider carb sync/clean.	Propeller, spark plugs, fuel filter, carb rebuild parts.
Hard starting / rough idle	Prime fuel system, verify choke/enricher function, check plug gap and compression.	Spark plugs, fuel lines/primer bulb, carb kits.
Excessive smoke (2‑stroke)	Confirm correct TC‑W3 oil, verify oil pump index and thermostat (cold running increases smoke).	Oil injection service parts, thermostat, fuel filter.
Gearcase noise / metal in gear oil	Check oil level and condition; inspect for water intrusion; evaluate prop shaft seal area for fishing line.	Lower unit seal kit, bearings, prop nut/hardware.

FAQs

Are parts interchangeable between different years or platforms?

Many wear items on Yamaha V4 2‑stroke families (115/130/140) cross over by year group, but there are exceptions. Always confirm using your exact model code/serial, shaft length, and gearcase style before ordering.

When should I replace the water pump impeller?

As a rule of thumb, every 100 hours or 1–2 seasons. In sandy, silty, or shallow environments, inspect more frequently and consider a full pump kit (housing, plate, seals) every other service.

How often should I change lower unit gear oil?

Change gear oil every 100 hours or annually. If oil appears milky or you find excessive metal on the drain magnet, pressure test the gearcase and replace seals.

What information helps confirm part compatibility?

Provide the model code and serial number from the bracket plate, shaft length (L/XL), control type (remote/tiller), and clear photos of the nameplate and the part you are replacing.

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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.