Yamaha 2-Stroke 36-40HP Outboard Engine Parts

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This page is for Yamaha 2‑Stroke 36–40HP outboard engines. Use it to locate compatible parts and practical service information, including maintenance tips, common replacement items, and troubleshooting guidance. You can also browse the main Yamaha collection. Scroll to the bottom of this page to start browsing parts for this engine, and remember you can use the Filter & Sort controls on the collection page to narrow results by horsepower, year range, and part category.

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How to Identify Your 36–40HP Model

Find the nameplate/serial plate on the transom bracket or clamp bracket. Record the full model code and serial number.
Decode the suffix to confirm shaft length (S/L/X), start type (manual/electric), and control type (tiller/remote).
Confirm it is a 2‑stroke platform; some markets offered both 2‑stroke and 4‑stroke around similar horsepower.
Within this range you may see inline‑2 or inline‑3 carbureted variants depending on year/market—match parts by exact model code.

Engine Overview

Yamaha 2‑Stroke 36–40HP (Carbureted)

Feature	Description
Configuration	Carbureted 2‑stroke outboard, typically inline‑2 or inline‑3 depending on year/market; available in manual or electric start with tiller or remote control options.
Common Models	36–40HP 2‑stroke families spanning multiple year codes and S/L/X shaft lengths. Use the exact model code for precise parts matching.
Advantages	Light weight, simple to service, quick hole‑shot, and broad aftermarket parts availability.
Notes	Component differences exist across years and variants (carburetion, ignition modules, gearcase styles). Always verify by model code and serial before ordering.

Routine Maintenance & Service Parts

Intervals below are general guidelines for typical recreational use. Always follow the procedures and schedules in your official Yamaha service manual.

Item	Interval*	Remarks	Parts Link
Gear oil (lower unit)	Every 100 hours or annually	Inspect for metal or water (milky oil). Service sooner after heavy use or submersion.	Yamaha Service & Maintenance Kits
Spark plugs	Inspect 50–100 hours; replace as needed	Use the correct heat range and gap; replace if fouled or worn.	Spark Plugs
Fuel filter / inline strainer	Every 100 hours or annually	Replace sooner if contamination or fuel restriction is suspected.	Fuel Filters
Water pump impeller / kit	200 hours or every 2 seasons	Replace sooner if tell‑tale is weak, overheating occurs, or after sand/silt operation.	Yamaha Water Pump Repair Kits
Anodes (internal & external)	Inspect every 50 hours; replace when 50% consumed	Choose alloy for your water type (fresh, brackish, salt). Keep bonding clean and tight.	Yamaha Anodes
Oil injection system (if equipped)	Annually	Inspect tank, lines, filters, and pump linkage; bleed air after service. For premix models, confirm the specified fuel/oil ratio.	Hoses
Thermostat	Inspect annually; replace every 2–3 seasons or as needed	Stuck thermostats affect warm‑up and overheat protection.	Yamaha Outboard Parts
Gearcase seal kit (if water intrusion)	As needed	Pressure/vacuum test after impact or if gear oil is milky.	Yamaha Lower Unit Seal Kits

Frequently Used Parts Categories

Routine Service – Yamaha Service & Maintenance Kits
Cooling System – Yamaha Water Pump Repair Kits
Fuel System – Fuel Filters
Ignition / Electrical – Electrical Items
Corrosion Protection – Yamaha Anodes
Props & Drive – Yamaha Propellers
Lower Unit Seals & Gaskets – Yamaha Lower Unit Seal Kits

Common Symptoms & Quick Checks

Symptom	Check First	Related Parts
Weak tell‑tale or overheat alarm	Inspect intake screens, water pump impeller, and thermostat; verify tell‑tale hose is clear.	Water pump kit, thermostat, intake screen, tell‑tale hose
Poor acceleration or power loss	Check propeller for damage/cavitation, fuel quality, fuel filter restriction, and plug condition.	Propeller, spark plugs, fuel filter, carburetor service kit
Hard starting or rough idle	Prime the bulb, verify choke/enrichment operation, and look for stale fuel or fouled plugs.	Spark plugs, fuel filter, choke/primer components, carburetor gaskets/jets
Excessive smoke (2‑stroke)	Confirm premix ratio or oil‑injection setting; ensure choke isn’t stuck on.	Spark plugs, oil‑injection hoses/filter, choke/enrichment parts
Gearcase noise or metal in oil	Drain and inspect gear oil; check for water intrusion and fishing line on prop shaft.	Gear oil, lower unit seal kit, prop shaft seals, thrust washer

FAQs

Are parts interchangeable between different years or platforms?

Some service items are shared, but ignition, carburetion, and gearcase components can vary by year, shaft length, and control configuration. Always match by full model code and serial number.

When should the impeller be replaced?

As a rule of thumb, replace the impeller every 2 seasons or about 200 hours. Service sooner if the tell‑tale weakens, you run in sand/silt, or you experience overheat warnings.

How often should I change the gear oil?

Change lower‑unit gear oil at least annually or every 100 hours. Inspect earlier after impact or if the oil looks milky (water contamination).

What information do you need to confirm part compatibility?

Provide the full model code, serial number, shaft length (S/L/X), control type (tiller or remote), and any notable options (e.g., power trim/tilt). Clear photos of the nameplate and target part also help.

Ready to find parts that fit your Yamaha 2‑Stroke 36–40HP outboard? Browse the main Yamaha collection 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.