Yamaha 2-Stroke Outboard Marine Engine Parts

(321 products)

This page is for Yamaha 2‑Stroke outboard engines. It helps you find compatible parts and service information, including maintenance tips, common replacement parts, and troubleshooting guidance. You can also browse the main Yamaha collection. Scroll to the bottom of this page to start browsing parts for your 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 Yamaha 2‑Stroke Model

Locate the nameplate/serial sticker on the transom bracket or swivel bracket. It lists the model code, serial number, and shaft length.
Decode the model suffix: common letters indicate shaft length (S/L/XL), manual vs. electric start, tiller vs. remote control, and production year.
Confirm platform features: small portables are single/twin carbureted; mid‑range models are often inline‑3; larger 115–300 HP are V4/V6 with oil injection (OX66 EFI or HPDI direct injection).
Note oiling method: premix (typ. 50:1) on older/smaller models vs. oil‑injection tank and pump on mid/large models—this affects service parts needed.

Platform Overview

Portable 2–15 HP

Feature	Description
Configuration	Single or twin‑cylinder, carbureted 2‑Stroke; manual or electric start
Common Models	2–3–6–8–9.9–15 HP 2‑Stroke portable series
Advantages	Very light weight and simple to service; easy transport and storage
Notes	Many use premix fuel; impeller and anodes are routine wear items; check tiller/remote control compatibility by suffix

Mid‑Range 25–90 HP

Feature	Description
Configuration	Inline‑2/3 carbureted 2‑Stroke with oil injection on many models
Common Models	25–30–40–50–60–70–75–85–90 HP 2‑Stroke families
Advantages	Strong hole‑shot and mid‑range torque; straightforward maintenance
Notes	Gearcase, impeller, and ignition components vary by year; confirm model code and shaft length before ordering

V4/V6 115–300 HP (OX66 EFI & HPDI)

Feature	Description
Configuration	V4/V6 2‑Stroke with oil injection; OX66 electronic fuel injection or HPDI direct injection
Common Models	115/130 (V4); 150/175/200 OX66; 150–250 HPDI; select 225–300 HP variants
Advantages	High output with proven Yamaha reliability; broad parts availability
Notes	Injection system (OX66 vs. HPDI) determines filters, pumps, and electrical parts; match by model code and serial

Routine Maintenance & Service Parts

Intervals below are general guidelines for typical recreational use. Always follow your engine’s official service manual.

Item	Interval*	Remarks	Parts Link
Gear oil (lower unit)	Every 100 hrs or annually	Inspect magnet for metal; replace seals if water intrusion is found	Yamaha Lower Unit Seal Kits
Spark plugs	Every 100 hrs or annually	Check heat range and gap; replace fouled or worn plugs	Spark Plugs
Fuel filter / water separator	Inspect every 50 hrs; replace annually	More frequent replacement for HPDI/OX66; drain water as needed	Fuel Filters
Water pump impeller / kit	Every 2–3 years (annually in sandy/silty water)	Restore cooling performance; inspect wear plate and housing	Yamaha Water Pump Repair Kits
Anodes (internal & external)	Inspect every 3–6 months; replace when 50% depleted	Match material (aluminum, zinc, magnesium) to your water type	Yamaha Anodes
Thermostat	Every 2–3 years	Replace if stuck or overheating/idle issues persist	Yamaha Outboard Parts
Oil‑injection system check (if equipped)	Annually	Verify pump calibration, lines, and tank screen; use correct TC‑W3 oil	Yamaha Service & Maintenance Kits
Propeller inspection	Every 50 hrs	Remove to check for fishing line; inspect hub and thrust washer	Yamaha Propellers

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
Trim & Planing Aids: Outboard Hydrofoil Stabilizers

Common Symptoms & Quick Checks

Symptom	Check First	Related Parts
Weak tell‑tale stream or overheat alarm	Inspect intake screens for debris; verify impeller age; confirm thermostat function	Water pump kit, thermostat, intake screen/anodes
Poor acceleration / power loss	Check fuel quality, filters, and spark plugs; verify throttle/link‑and‑sync; for HPDI/OX66, check high/low‑pressure filters	Fuel filters, spark plugs, fuel pump/screens
Hard starting / rough idle	Confirm choke/enrichment operation; inspect plugs and idle mixture; check air leaks in fuel lines	Spark plugs, primer bulb/hoses, carb kits or injector filters (as equipped)
Excessive smoke (2‑Stroke)	Verify premix ratio or oil pump setting; ensure thermostat closes properly to reach operating temp	Thermostat, oil injection components, spark plugs
Gearcase noise / metal in gear oil	Check prop shaft for fishing line; inspect seals; test gear oil for water (milky)	Lower unit seal kit, thrust washer, prop hub

FAQs

Are parts interchangeable between different years or platforms?

Some items (anodes, prop nuts, certain seals) cross multiple years, but many components vary by platform (portable, inline‑3, V4/V6; OX66 vs. HPDI). Always confirm the full model code and serial before ordering.

When should I replace the water pump impeller?

Every 2–3 years for typical use, or annually if you run in sandy/silty water or notice a weak tell‑tale stream or overheat warning. Replace the full kit if the wear plate or housing shows scoring.

How often should lower unit gear oil be changed?

Change at least every 100 hours or annually. If the drained oil appears milky or you find more than fine paste on the magnet, pressure test the gearcase and replace seals as needed.

What information do I need to confirm part compatibility?

Provide the model code and serial number from the transom bracket plate, shaft length, starting/controls type, and whether the engine uses premix, oil injection, OX66 EFI, or HPDI.

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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.