Yamaha 2-Stroke 6-8HP Outboard Engine Parts

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This page is dedicated to Yamaha 2-Stroke 6–8HP outboard engines. Use it to find compatible parts and key service information, including maintenance tips, commonly replaced components, and troubleshooting guidance. You can also browse our main Yamaha 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.

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How to Identify Your 6–8HP Model

Nameplate location: look on the transom clamp bracket or swivel bracket for the model code and serial number.
Reading the code: Yamaha small 2‑stroke models often appear as 6C/8C or 6D/8D, followed by suffixes indicating shaft length (S=15, L=20), tiller vs. remote control, and production year.
Gearcase variant: these engines commonly use the Type C/D lower unit. Confirming your gearcase type helps ensure the right seals, gears, and shift parts.
Fueling: most 6–8HP 2‑strokes are premix (typically 50:1 TC‑W3). If equipped with oil injection in some markets, verify pump condition and hoses during service.

Platform Overview

Yamaha 6–8HP 2‑Stroke (Type C)

Feature	Description
Configuration	Inline‑2 carbureted 2‑stroke; manual or electric start; tiller steer common.
Common Models	6C / 8C family (examples across various years and shaft lengths).
Advantages	Lightweight, simple maintenance, good low‑speed thrust for dinghies and small craft.
Notes	Many cooling and seal items interchange with Type D, but internal gear and shift parts may differ—verify before ordering.

Yamaha 6–8HP 2‑Stroke (Type D)

Feature	Description
Configuration	Inline‑2 carbureted 2‑stroke with Type D lower unit; manual/remote variants exist.
Common Models	6D / 8D family (short and long shaft versions).
Advantages	Durable gearcase, broad parts availability, straightforward seasonal service.
Notes	Propellers commonly use a 7‑spline hub; confirm shaft length (S/L) and lower unit style when selecting gears and seals.

Routine Maintenance & Service Parts

Intervals below are general guidelines for small 2‑stroke outboards. Always follow the procedures and schedules in your official Yamaha service manual.

Item	Interval*	Remarks	Parts Link
Gear oil (lower unit)	Every 100 hrs or annually	Inspect for water (milky oil). Replace seals if intrusion is found.	Yamaha Lower Unit Seal Kits
Spark plugs	Every 100 hrs or annually	Use correct heat range and gap; replace if fouled or worn.	Spark Plugs
Inline fuel filter	Every 100 hrs or annually	Replace clogged or discolored filters to protect carburetors.	Fuel Filters
Water pump impeller / kit	Every 200 hrs or 2 seasons (annually in sandy/muddy water)	Critical for cooling; replace sooner if tell‑tale weak or intermittent.	Yamaha Water Pump Repair Kits
Anodes (external & internal)	Inspect often; replace when ~50% consumed	Choose alloy for your water (zinc, aluminum, or magnesium).	Yamaha Anodes
Propeller inspection	Each trip / at service	Check for dings and fishing line; verify cotter and nut torque.	Yamaha Propellers
2‑Stroke fuel/oil	Every outing	Use fresh fuel and the specified oil mix (commonly 50:1 TC‑W3). Service oil‑injection only if equipped.	Yamaha Outboard Parts

Frequently Used Parts Categories

Routine Service: Yamaha Service & Maintenance Kits
Cooling System: Yamaha Water Pump Repair Kits
Lower Unit / Seals: Yamaha Lower Unit Seal Kits
Propellers & Hubs: Yamaha Propellers
Corrosion Protection: Yamaha Anodes
Ignition / Spark: Spark Plugs
Sealing Components: Yamaha Oil Seals

Common Symptoms & Quick Checks

Symptom	Check First	Related Parts
Weak tell‑tale / overheat alarm	Inspect intake screens, tell‑tale hose, and thermostat; verify impeller condition.	Water pump kit, impeller key, thermostat, pump housing components
Poor acceleration / power loss	Check fuel quality, inline filter, spark plugs, prop damage; confirm carb settings.	Fuel filter, spark plugs, propeller, carburetor service items
Hard starting / rough idle	Prime bulb firmness, choke/enricher function, plug gap, and air leaks on fuel lines.	Spark plugs, fuel filter, gasket/seal items for fuel lines
Excessive smoke (2‑stroke)	Confirm correct mix ratio; look for stuck choke or flooding carb.	Spark plugs, carburetor service items
Gearcase noise / metal in gear oil	Check oil level/condition; inspect for water intrusion and prop shaft line damage.	Lower unit seal kit, bearings/gears, fresh gear oil

FAQs

Are parts interchangeable between Type C and Type D gearcases?

Many service items such as impellers and some seals overlap, but internal gearsets, shift components, and certain housings may differ. Verify your exact gearcase type and model code before ordering.

When should the impeller be replaced?

As a rule of thumb, every 200 hours or two seasons, and annually if you run in sandy or silty water. Replace immediately if the tell‑tale is weak or intermittent.

How often should I change the lower unit gear oil?

Change every 100 hours or annually, and anytime you see milky oil (water intrusion) or after an impact to the prop or gearcase.

What information helps confirm part compatibility?

Provide the model code, serial number, shaft length (S or L), gearcase type (C or D), and clear photos of the nameplate and the part or area you 27re servicing.

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If you 27re unsure about your model, send us a photo of the nameplate and the part you need and we 27ll help verify compatibility.