Yamaha 2-Stroke 9.9-15HP Outboard Marine Engine Parts

(10 products)

This page focuses on Yamaha 2‑Stroke 9.9–15 HP outboard engines and helps you quickly find compatible parts and service information. Below you’ll find maintenance tips, commonly replaced parts, and troubleshooting guidance. You can also browse the 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 or section.

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How to Identify Your 9.9–15 HP Model

Find the ID/serial plate on the transom bracket or swivel bracket. It lists the model code, serial number, and often the shaft length.
Model code prefixes help identify platform: older Type C/D engines typically use a 682 prefix; later 9.9/15 models often show 63V/63W prefixes.
Suffix letters indicate details such as shaft length (S/L/X), tiller vs. remote, and electric vs. manual start.
Confirm it’s a 2‑Stroke model (carbureted, uses premix or oil‑injection) to avoid mixing parts with 4‑Stroke variants.

Platform Overview

Type C/D (682 series)

Feature	Description
Configuration	Inline‑2, carbureted 2‑Stroke, manual or electric start options
Common Models	9.9D / 15D variants with 682‑prefix model identification
Advantages	Light weight, simple service, strong low‑to‑mid throttle response
Notes	Gasket sets, covers, and some hardware differ from later 63V/63W models; match parts using the 682 model prefix.

Later 63V/63W series

Feature	Description
Configuration	Inline‑2, carbureted 2‑Stroke, incremental casting and cooling updates vs. 682 series
Common Models	9.9F / 15F variants with 63V/63W‑prefix model identification
Advantages	Refined castings, wide parts availability, dependable performance
Notes	Some exhaust cover, gasket, and cooling components are specific to 63V/63W; verify by model code and serial range.

Routine Maintenance & Service Parts

Intervals below are general guidelines for typical use. Always follow the service schedule and specifications in your Yamaha factory manual.

Item	Interval*	Remarks	Parts Link
Gear oil (lower unit)	Every 100 hrs or annually	Check for water contamination (milky oil). Replace drain gaskets as needed.	Yamaha Service & Maintenance Kits
Spark plugs	Every 100 hrs or annually	Inspect gap and insulator color; replace if fouled or worn.	Spark Plug Collection
Inline fuel filter	Every 100 hrs or annually	Replace to prevent lean conditions and hard starting.	Fuel Filters
Water pump impeller / kit	100 hrs or every 1–2 seasons	Replace more often for sandy/silty use or weak telltale.	Yamaha Water Pump Repair Kits
Anodes (internal/external)	Inspect every 50 hrs; replace at ~50% loss	Match material to water type (zinc for salt, aluminum/magnesium as appropriate).	Yamaha Anodes
2‑Stroke oil premix or oil‑injection service	Every fill (premix); inspect system annually	Use marine TC‑W3 oil at the specified ratio if premix; check hoses, tank, and pump indexing on oil‑injection models.	Yamaha Service & Maintenance Kits
Lower unit seal kit (if water intrusion found)	As needed after pressure/vac test	Replace prop shaft, drive shaft, and shift shaft seals if leak is confirmed.	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
Propellers & Hardware — Propellers
Corrosion Protection — Yamaha Anodes
Gearcase Seals — Yamaha Lower Unit Seal Kits

Common Symptoms & Quick Checks

Symptom	Check First	Related Parts
Weak telltale or overheat alarm	Inspect intake screens, telltale hose, and impeller; verify thermostat operation.	Water pump kit, thermostat, intake screen
Poor acceleration or power loss	Check fuel quality, replace inline filter, verify carb synchronization and throttle linkage.	Fuel filter, carburetor service kit, spark plugs
Hard starting or rough idle	Confirm choke/enrichment function, inspect plug condition and gap, look for vacuum leaks at gaskets.	Spark plugs, fuel filter, gaskets
Excessive smoke (2‑Stroke)	Verify oil ratio (premix) or oil‑injection calibration; check for stuck choke or flooded carb.	Service kit (tune‑up), carburetor kit, fuel filter
Gearcase noise or metal in gear oil	Check oil level/condition; inspect prop shaft for fishing line; perform pressure/vac test.	Lower unit seal kit, gear oil, prop hardware

FAQs

Are parts interchangeable between 682 (Type C/D) and 63V/63W models?

Many service items are similar, but critical components such as exhaust covers, gaskets, and some cooling parts differ. Match parts to your model code prefix (e.g., 682 vs. 63V/63W) and serial range to ensure compatibility.

When should the impeller be replaced?

Replace every 100 hours or 1–2 seasons, and sooner if the telltale is weak, the engine overheats, or the motor frequently runs in sandy or silty water.

How often should I change the gear oil?

At least annually or every 100 hours. Inspect for a milky appearance or metal flakes; either indicates the need for inspection and possible seal replacement.

What information helps confirm part compatibility?

Provide the full model code, serial number, shaft length, start type (manual/electric), and whether the engine is oil‑injected or premix. Photos of the nameplate and the part needing replacement are also helpful.

Ready to find parts by horsepower, year, and model? Browse the Yamaha collection and use the filters to zero in on your exact 9.9–15 HP 2‑Stroke setup.

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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.