Yamaha 25-200HP 2-Stroke Outboard Marine Engine Parts

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This page is dedicated to Yamaha 2-Stroke 25–200HP outboard engines. Use it to find compatible parts, routine service guidance, and quick troubleshooting tips. You can also browse the main Yamaha collection for more categories and components. 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/section.

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How to Identify Your 25–200HP Model

Locate the nameplate/serial tag on the transom bracket or swivel bracket. It shows the model code, serial number, and often the shaft length.
Read the model code: the horsepower is followed by feature letters (e.g., manual/electric start, tiller/remote) and a suffix that indicates shaft length and year code.
Confirm it’s a 2‑stroke: look for an oil injection tank (remote or under-cowl) or premix instructions on the cowl. Carburetors are typical across this range.
If you’re near 115–200 HP, note the engine family: many 115/130 are V4 and 150/175/200 are V6. Smaller 25–90 HP are typically inline twins or triples.

Engine Platform Overview

Inline Twin / Triple (25–90 HP)

Feature	Description
Configuration	Carbureted 2‑stroke inline‑2 (25–30 HP) and inline‑3 (40/50/60/70/90 HP) with premix or oil‑injection.
Common Models	25–30 HP twin; 40–90 HP triple 2‑stroke families.
Advantages	Light weight, quick holeshot, simple maintenance with accessible carburetors and ignition components.
Notes	Impellers and gearcase parts often group by HP family; propeller spline/tooth count and gear ratio vary—verify via model code.

V4 Platform (115–130 HP)

Feature	Description
Configuration	Carbureted 2‑stroke V4 with oil‑injection on most models.
Common Models	115/130 HP V4 families.
Advantages	Stronger mid‑range torque and good durability; popular for multi‑purpose fishing and runabout hulls.
Notes	Thermostats, water pump kits, and ignition parts differ from inline engines. Use model code/year to confirm compatibility.

V6 Platform (150–200 HP)

Feature	Description
Configuration	2‑stroke V6 (carb or EFI on certain years); most use remote oil tanks and under‑cowl filters.
Common Models	150/175/200 HP V6 families.
Advantages	High output, strong top‑end power for heavier boats and offshore use.
Notes	Water pump, gearcase, anode sets, and ignition components are platform‑specific; always verify by model and serial.

Routine Maintenance & Service Parts

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

Item	Interval*	Remarks	Parts Link
Gear Oil (Lower Unit)	Every 100 hours or annually	Check for water (milky oil) or metal; reseal if contamination is present.	Yamaha Service & Maintenance Kits
Spark Plugs	Inspect 50–100 hours; replace as needed	Use the correct heat range and gap per model; replace if fouled or worn.	Spark plug
Fuel Filter / Water Separator	Inspect 50 hours; replace 100 hours or as needed	Replace sooner for poor fuel quality or storage use; drain separators regularly.	Fuel Filters
Water Pump Impeller / Kit	Every 2 years or 200 hours	Replace sooner in sandy/silty water or if tell‑tale is weak.	Yamaha Water Pump Repair Kits
Anodes (Internal & External)	Inspect every 50 hours; replace at ~50% loss	Match anode material to water type (salt/brackish/fresh) and keep mounting surfaces clean.	Yamaha Anodes
Oil Injection System (Tank Screen, Lines, Bleed)	Annually or when service history is unknown	Inspect/replace brittle hoses, clean tank screen, confirm pump operation and alarm function.	Hoses
Lower Unit Seal Kit (if water intrusion found)	As needed	If gear oil is milky or leaking at prop/shift, reseal before continued use.	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
Corrosion Protection: Yamaha Anodes
Propellers & Hardware: Propellers
Lower Unit Sealing: Yamaha Lower Unit Seal Kits

Common Symptoms & Quick Checks

Symptom	Check First	Related Parts
Weak tell‑tale stream or overheat alarm	Inspect intake screens for blockage, verify impeller condition, and confirm thermostat operation.	Water pump kit, intake screens, thermostat
Poor acceleration or power loss	Check propeller for damage/slip, replace clogged fuel filters, verify spark plug condition and timing marks.	Propeller, fuel filter, spark plugs
Hard starting or rough idle	Drain stale fuel, confirm choke/enrichment operation, inspect plugs and fuel/oil lines for air leaks.	Spark plugs, fuel filters, hoses/lines
Excessive smoke (2‑stroke)	Verify correct premix ratio or oil‑injection setup, ensure choke isn’t stuck, and check thermostat (cold running).	Oil injection components, choke/enrichment parts, thermostat
Gearcase noise or metal in gear oil	Inspect gear oil for water/metal, check prop shaft and seals; service immediately to prevent damage.	Gear oil, lower unit seal kit, bearings

FAQs

Are parts interchangeable between different years or platforms?

Not reliably. Yamaha 2‑stroke parts vary by platform (inline, V4, V6), year, shaft length, and options. Always confirm using the exact model code and serial number.

When should the impeller be replaced?

As a rule of thumb, every 2 years or 200 hours—sooner in sandy, silty, or shallow conditions, or any time cooling performance drops.

How often should gear oil be changed?

Change every 100 hours or annually. If the oil appears milky or contaminated with metal, reseal the gearcase and replace the oil before further operation.

What information do you need to confirm part compatibility?

Provide the full model code, serial number, shaft length, and a brief description of the controls (tiller/remote). A photo of the nameplate and the part area helps ensure an exact match.

Ready to find what fits? Browse the main Yamaha collection and use Filter & Sort to narrow 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.