Yamaha 2-Stroke 35-300HP Outboard Marine Engine Parts

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This page is tailored for Yamaha 2-Stroke 35–300HP outboard engines. Use it to quickly find compatible parts, routine service guidance, maintenance tips, and troubleshooting help. You can also browse the main Yamaha collection, and at the bottom of this page you’ll find links to start browsing parts for this engine. 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 35–300HP Model

Locate the nameplate/serial plate on the transom bracket or swivel bracket; it lists model, serial number, and sometimes shaft length.
Read the model code and suffix: the code indicates horsepower and series, while suffix letters typically denote shaft length (S/L/XL), starting and control type, and production revision/year.
Confirm 2‑Stroke configuration: presence of an oil injection tank (under-cowl or remote) or premix requirement, carburetors, and two-stroke decals.
Differentiate platforms: midrange models (35–90HP) are usually compact inline engines; higher output models (115–300HP) will be larger V4/V6 platforms with multiple carburetors and larger gearcases.

Platform Overview

Midrange 2‑Stroke (35–90HP)

Feature	Description
Configuration	Carbureted 2‑stroke inline platform (commonly twin or inline‑3, depending on HP).
Common Models	Typical 35/40/50/60/70/75/85/90HP 2‑stroke outboard models.
Advantages	Light weight, simple maintenance, strong hole‑shot for small/midsize boats.
Notes	Pay attention to water pump service, carb sync/cleaning, and correct oil injection or fuel premix ratio.

High Power 2‑Stroke (115–300HP V4/V6)

Feature	Description
Configuration	V4/V6 2‑stroke platforms, typically carbureted or basic EFI on later variants; oil‑injected.
Common Models	Typical 115/130/150/175/200/225/250/300HP 2‑stroke outboards.
Advantages	High output, strong mid‑range torque, proven platforms widely used through the 1990s–2000s.
Notes	Maintain water pump and cooling passages, keep fuel filters clean, and verify oil injection system health to protect powerheads.

Routine Maintenance & Service Parts

Intervals below are general guidelines for Yamaha 2‑stroke outboards. Always follow your specific model’s official service manual.

Item	Interval*	Remarks	Parts Link
Gear oil (lower unit)	Every 100 hours or annually	Inspect for water intrusion/metal; replace seals if contamination is found.	Yamaha Lower Unit Seal Kits
Spark plugs	Inspect every 50 hours; replace 100–200 hours	Use correct heat range; check gap and signs of fouling.	Spark Plug
Fuel filter / water‑separating filter	Every 100 hours or annually	Replace more often in high‑ethanol or contaminated fuel environments.	Fuel Filters
Water pump impeller / kit	Every 200 hours or 2 years (inspect annually)	Critical for cooling; replace sooner if weak tell‑tale or overheating occurs.	Yamaha Water Pump Repair Kits
Anodes (internal & external)	Inspect every 50 hours; replace when 50% depleted	Use correct alloy for fresh, brackish, or salt water.	Yamaha Anodes
Oil injection system check	Every 100 hours or annually	Verify pump output, lines, and tank cap/filters; premix ratio if applicable.	Yamaha Outboard Parts
Fuel lines/primer bulb & connectors	Inspect every 50 hours; replace as needed	Check for softening, cracking, or air leaks that cause hard starts or surging.	Fuel Connector / Hoses

Frequently Used Parts Categories

Routine Service: Yamaha Service & Maintenance Kits
Cooling System: Yamaha Water Pump Repair Kits
Fuel System: Fuel Filters · Fuel Pumps · Fuel Connector
Ignition / Electrical: Yamaha Starters · Electrical Items
Corrosion Protection: Yamaha Anodes
Propulsion: Yamaha Propellers
Sealing & Gaskets: Yamaha Gaskets · Yamaha Oil Seals

Common Symptoms & Quick Checks

Symptom	Check First	Related Parts
Weak tell‑tale or overheat alarm	Inspect intake screens for debris; verify impeller condition and thermostat.	Water pump kit, thermostat, intake screen
Poor acceleration or power loss	Check fuel quality, filters, primer bulb, and carb synchronization/cleanliness.	Fuel filter, fuel lines/connector, fuel pump, carburetor repair kit
Hard starting / rough idle	Verify choke/enrichment, plug condition/gap, and for air leaks in fuel line.	Spark plugs, fuel connector/hoses, carburetor kit
Excessive smoke (2‑stroke)	Confirm correct oil ratio or oil pump output; check for stuck floats/over‑rich carb.	Oil injection components, carburetor repair kit, spark plugs
Gearcase noise or metal in gear oil	Drain and inspect oil; check prop shaft seals and water intrusion.	Lower unit seal kit, prop hub/propeller hardware

FAQs

Are parts interchangeable across different years or platforms (inline vs V‑series)?

Some service items overlap, but many components are platform‑ and year‑specific. Always confirm by model code, serial number, and shaft length before ordering.

When should I replace the water pump impeller?

As a rule of thumb, inspect annually and replace every 2 seasons or 200 hours—sooner if sand, silt, or a weak tell‑tale stream is observed.

How often should I change lower unit gear oil?

Replace every 100 hours or annually. If the drained oil shows milkiness (water) or metal, service seals and re‑inspect.

What information do you need to confirm part compatibility?

Please provide the full model code, serial number, horsepower, shaft length, and a brief description of the symptom or the exact part you are replacing.

Ready to find parts for your Yamaha 2‑Stroke 35–300HP outboard? Browse the main Yamaha collection and filter 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.