Yamaha 2-Stroke Outboard Marine Engines 6-300HP Parts

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This page supports Yamaha 2-Stroke outboard marine engines from 6–300 HP. Use it to find compatible parts and key service information, including maintenance tips, commonly replaced components, and troubleshooting guidance. You can also browse the main Yamaha collection any time. Scroll to the bottom of this page to start browsing parts for your 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 6–300 HP Model

Locate the model/serial plate on the transom bracket or swivel bracket. A secondary sticker is often found under the engine cowl.
Read the full model code and suffix: the letters typically indicate shaft length (S/L/X), control type (tiller/remote), and market; the code helps confirm exact parts.
Confirm stroke type: all engines covered here are Yamaha 2‑Stroke. Larger 200–300 HP models may be labeled HPDI on the cowl; small models may be premix or Autolube oil‑injected.
Note year or production range from the label or owner’s manual; some parts changed across years even within the same horsepower.

Platform Overview

Small Portable Range (6–25 HP)

Feature	Description
Configuration	Single- or twin-cylinder, carbureted 2‑Stroke; manual or electric start depending on model.
Common Models	6, 8, 9.9, 15, 25 HP 2‑Stroke variants.
Advantages	Very light weight and simple service; excellent portability.
Notes	Some are premix; others use Autolube oil injection. Impellers and anodes are routine service items.

Midrange (30–90 HP)

Feature	Description
Configuration	Inline‑3 (and select inline‑4) carbureted 2‑Stroke with Autolube oil injection on many models.
Common Models	30, 40, 50, 60, 70, 75, 85, 90 HP 2‑Stroke models.
Advantages	Strong mid‑range torque and simple mechanicals; widely supported parts.
Notes	Fuel filtration and water pump service are key to reliability; prop selection affects holeshot and top speed.

Large V4/V6 and HPDI (115–300 HP)

Feature	Description
Configuration	V4 (115/130 HP) and V6 (150–300 HP) 2‑Stroke; many 200–300 HP units are HPDI V6 3.3L from the 2000s era.
Common Models	115/130 V4; 150/175/200/225/250; 200/225/250/300 HPDI V6 examples (approx. late 1990s–2009 for HPDI).
Advantages	High output, strong acceleration, and broad parts availability.
Notes	HPDI systems use dedicated high‑pressure fuel filtration; match parts by full model code and year to ensure correct fitment across V6 families.

Routine Maintenance & Service Parts

Intervals below are general guidelines for Yamaha 2‑Stroke outboards; always follow the official service manual for your exact model and operating conditions.

Item	Interval*	Remarks	Parts Link
Gear oil (lower unit)	Every 100 hours or annually	Change more often if water intrusion or after impact; inspect magnet for metal.	Yamaha Service & Maintenance Kits
Spark plugs	Every 100 hours or annually	Check gap and color; replace sooner with heavy trolling or fouling.	Spark Plugs
Fuel filter / water separator	Inspect every 50 hours; replace 100 hours	Critical for carb and HPDI models; keep water out of system.	Fuel Filters
Water pump impeller/kit	Every 100 hours or 1–2 seasons	Replace sooner if weak tell‑tale or overheat alarm.	Yamaha Water Pump Repair Kits
Anodes	Inspect 50 hours; replace as needed	Essential in brackish/salt water; keep paint off contact surfaces.	Yamaha Anodes
Oil injection system service	200 hours or 2 years	Inspect/clean oil tank screen and lines, verify pump calibration; premix models follow correct ratio.	Yamaha Outboard Parts
Lower unit seals (if leakage found)	As needed	Milky gear oil or water intrusion indicates seal service.	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
Propulsion – Yamaha Propellers
Corrosion Protection – Yamaha Anodes
Gearcase / Seals – Yamaha Lower Unit Seal Kits

Common Symptoms & Quick Checks

Symptom	Check First	Related Parts
Weak tell‑tale stream or overheat alarm	Debris on intake screens, thermostat stuck, worn impeller, pinched hose	Water pump kit, thermostat, intake screen, anodes
Poor acceleration or power loss	Damaged prop, clogged fuel filter, fouled plugs, low compression	Propeller, fuel filter, spark plugs, carburetor/reed service
Hard starting or rough idle	Primer bulb condition, choke/enrichment operation, air leaks in lines	Spark plugs, carburetor kit, fuel hoses and clamps, starter/battery checks
Excessive smoke or oiling	Premix ratio, oil pump setting, thermostat stuck open (running cold)	Oil pump service, thermostat, spark plugs
Gearcase noise or metal in gear oil	Low/contaminated gear oil, fishing line on prop shaft, seal damage	Lower unit seal kit, bearings, gear oil

FAQs

Are parts interchangeable between different years or platforms?

Some service items overlap, but many components vary by platform (inline vs V‑series) and production year. Always match parts using the full model code and serial to ensure compatibility.

When should the water pump impeller be replaced?

As a rule of thumb, replace the impeller every 100 hours or each season. If the tell‑tale is weak, the engine overheats, or you run in sandy/shallows, service it sooner.

How often should I change the gear oil?

At least annually or every 100 hours, whichever comes first. Inspect after break‑in, any prop strike, or submersion to catch water intrusion early.

What information helps confirm part compatibility?

Provide the full model code, serial number, horsepower, shaft length, and approximate year. A clear photo of the nameplate and the part you’re replacing speeds verification.

Ready to find parts for your Yamaha 2‑Stroke 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.