Yamaha 2-Stroke 8HP Outboard Marine Parts

(52 products)

This page focuses on Yamaha 2-Stroke 8HP outboard engines. Use it to find compatible parts and service information, including maintenance tips, common replacement parts, and troubleshooting guidance. You can also browse the main Yamaha outboard 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 8HP Model

Find the nameplate/serial tag on the transom bracket. It shows the model code, shaft length, and serial number.
Model code and suffix: common letters include S (15" shaft), L (20" shaft), M (manual start), E (electric start), and R (remote). Example formats include 8MSH or 8MLH.
2‑Stroke identification: premix fuel/oil is typical on these portable twins; some markets had oil-injection—verify before servicing.
Propeller details: note diameter/pitch and whether your prop uses a shear pin or splined hub; this affects hardware selection.

Platform Overview

Yamaha 8HP 2‑Stroke Portable (Inline‑2)

Feature	Description
Configuration	Inline‑2, carbureted 2‑stroke, CDI ignition; manual or electric start; tiller or remote options.
Common Models	Examples include 8MSH / 8MLH variants (short/long shaft; manual start). Naming varies by market and year.
Advantages	Lightweight and portable; simple service; strong low‑speed thrust for small boats and tenders.
Notes	Use OEM‑spec spark plugs and a fresh water pump impeller annually. Verify shaft length (S/L) and starting/control options when selecting parts.

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	Check for water intrusion (milky oil) and metal debris; replace drain screw gaskets.	Yamaha Outboard Parts
Spark plugs	Inspect every 50 hours; replace 100 hours or as needed	Use OEM‑spec heat range and gap; replace sooner if fouled from rich mix or extended trolling.	Spark Plugs
Fuel filter / inline filter	Inspect every 50 hours; replace annually	Replace sooner if contaminated fuel, varnish, or debris is suspected.	Fuel Filters
Water pump impeller / kit	Every 100 hours or annually	Essential for cooling on shallow/silty water use; consider full kit with housing if wear is evident.	Yamaha Water Pump Repair Kits
Anodes (internal/external)	Inspect every 50 hours; replace when 50% consumed	Use alloy suited to your water (zinc, aluminum, or magnesium). Maintain clean metal contact.	Yamaha Anodes
2‑Stroke oil / oiling system	Every use; inspect system seasonally	Most 8HP models use 50:1 premix. If oil‑injected (market dependent), service lines/pump and verify calibration.	Yamaha Outboard Parts
Propeller & hardware	Inspect each trip; replace damaged parts as needed	Check shear pin/cotter pin and prop nut security; carry spares for remote trips.	Yamaha Propellers
Lower unit seal kit (if water intrusion found)	As needed	If gear oil is milky, pressure/vacuum test and reseal before further use.	Yamaha Lower Unit Seal Kits

*Intervals are typical guidelines; always defer to your engine’s official service schedule.

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
Propellers & Hardware: Yamaha Propellers
Lower Unit Seals: Yamaha Lower Unit Seal Kits
Corrosion Protection: Yamaha Anodes

Common Symptoms & Quick Checks

Symptom	Check First	Related Parts
Weak tell‑tale stream or overheat alarm	Inspect intake screens for blockage; verify impeller condition; confirm thermostat operation; ensure tell‑tale hose isn’t kinked.	Water pump impeller/kit, thermostat, intake screen grommets, tell‑tale hose
Poor acceleration or power loss	Check prop for damage/cavitation; replace fouled plugs; confirm fresh fuel and clean filter; inspect carb settings and linkage.	Propeller and hardware, spark plugs, inline fuel filter, carburetor gaskets
Hard starting or rough idle	Verify choke/enrichment function; check plug gap; inspect fuel primer bulb and lines for air leaks; clean carb jets if varnished.	Spark plugs, fuel lines/primer bulb, carburetor repair parts
Excessive smoke (2‑stroke)	Confirm correct premix ratio (typically 50:1); ensure fresh plugs; check idle mixture; verify oil pump settings if oil‑injected.	Spark plugs, fuel/oil lines, carburetor gaskets, oil pump components (if equipped)
Gearcase noise or milky gear oil	Inspect prop shaft for fishing line; pressure/vacuum test the gearcase; replace seals and refill with fresh gear oil.	Lower unit seal kit, drain screw gaskets, gear oil

FAQs

Are parts interchangeable between different 8HP years or platforms?

Sometimes, but not always. Even small changes in ignition, carburetion, or shaft length can affect part fit. Use your full model code and serial number to verify compatibility before ordering.

When should the water pump impeller be replaced?

Annually or every 100 hours is a common guideline. Replace sooner if you run in sandy or silty water, or if the tell‑tale stream weakens.

How often should I change the lower unit gear oil?

Change gear oil every 100 hours or at least once per year. Inspect for metal shavings and water intrusion each time you drain it.

What information do you need to confirm part compatibility?

Provide the complete model code, serial number, shaft length (S/L), starting type (manual/electric), and any accessories (tiller vs. remote). Photos of the nameplate and the part you’re replacing are also helpful.

Ready to find the right components? Browse the main Yamaha outboard 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.