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Yamaha 15HP 2-Stroke Outboard Motor

(60 products)

This page is for Yamaha 2‑Stroke 15HP outboard engines. It helps you find compatible parts and basic service information, including maintenance tips, common replacement parts, and troubleshooting guidance. You can also browse the main Yamaha collection for a wider parts selection. Scroll to the bottom of the page 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/section.

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How to Identify Your 15HP Model

  • Locate the nameplate/serial plate on the transom bracket (usually port/left side). It shows the model code, shaft length, and serial number.
  • Read the model code and suffix carefully. Suffix letters typically indicate shaft length (S ≈ 15 in, L ≈ 20 in) and control/start type (tiller vs. remote; manual vs. electric start).
  • Confirm it’s a 2‑Stroke: 2‑stroke models use premix fuel or an oil‑injection tank, and do not have a crankcase oil fill cap/dipstick like a 4‑stroke.
  • Measure shaft length if unsure (center of mounting bracket to anti‑ventilation plate) to ensure propeller, gearcase, and water pump parts match.

Engine Overview

Yamaha 15HP 2‑Stroke Twin

Feature Description
Configuration Inline 2‑cylinder, carbureted 2‑stroke with CDI ignition; tiller or remote control variants; short (S) or long (L) shaft.
Common Models 15HP 2‑Stroke family in S/L shaft lengths and manual/electric start. Verify exact model code and serial for best parts match.
Advantages Lightweight, quick throttle response, simple maintenance, strong low‑to‑mid‑range torque for small boats and tenders.
Notes Use the correct fuel/oil strategy (premix vs. oil‑injection). Verify shaft length when ordering water pump and gearcase parts; some items vary by year and configuration.

Routine Maintenance & Service Parts

Intervals below are general guidelines for typical recreational use. Always follow your official Yamaha service manual for procedures and specifications.

Item Interval* Remarks Parts Link
Gear oil (lower unit) Every 100 hours or annually Inspect for metal or milky oil; replace gaskets as needed. Yamaha Outboard Parts
Spark plugs Inspect 50 hours; replace 100 hours Use the correct heat range and gap; replace if fouled or worn. Spark Plugs
Fuel filter / in‑line filter Inspect 50 hours; replace annually Replace more often with ethanol fuel or contamination. Fuel Filters
Water pump impeller/kit Every 2 seasons or 200 hours (annually in silty/sandy use) Restore tell‑tale flow and cooling performance; confirm shaft length before ordering kits. Yamaha Water Pump Repair Kits
Anodes (internal & external) Inspect quarterly; replace when 50% consumed Choose zinc, aluminum, or magnesium to match your water type. Yamaha Anodes
2‑Stroke oil & fuel mixture / oil‑injection system Check each refuel; inspect system annually Premix ratios vary (50:1 common). For oil‑injection, inspect hoses and bleed/verify pump output per manual. Yamaha Outboard Parts
Thermostat Test annually; replace if overheating or running too cool A stuck thermostat affects cooling and mixture quality. Yamaha Outboard Parts
Lower unit seal kit As needed (water intrusion, leaks, fishing line damage) Replace seals after contamination or during gearcase repairs. Yamaha Lower Unit Seal Kits
Propeller & hardware Inspect each trip; service as needed Check for dings, bent blades, and fishing line at the prop shaft. Yamaha Propellers

Frequently Used Parts Categories

Common Symptoms & Quick Checks

Symptom Check First Related Parts
Weak tell‑tale stream or overheat alarm Inspect intake screens for debris, verify hose pressure on flush, check impeller wear and thermostat operation. Water pump repair kit, thermostat, intake screens, gaskets
Hard starting or rough idle Confirm fresh fuel and primer bulb firmness, verify choke/enrichment, inspect plugs for fouling, check for air leaks. Spark plugs, fuel filter, carburetor kit, fuel hoses
Poor acceleration or power loss Examine propeller for damage or improper pitch, check throttle opening and carb jets, verify compression. Propellers, spark plugs, fuel filters, carburetor components
Excessive smoke (2‑Stroke) Verify premix ratio, ensure choke not stuck, check thermostat for stuck‑open (running cold), inspect oil‑injection settings if equipped. Spark plugs, thermostat, carburetor parts, hoses
Gearcase noise or metal in gear oil Check oil level and condition, look for water intrusion (milky), inspect for fishing line at prop shaft seals. Lower unit seal kit, bearings, water pump kit, propeller hardware

FAQs

Are parts interchangeable across different years or platforms?

Many service items are shared across multiple 15HP 2‑Stroke variants, but key components (gearcase, ignition, carburetor, and cooling parts) may differ by year, shaft length, and start/control type. Always confirm with the model code and serial number.

When should the impeller be replaced?

As a rule of thumb, inspect annually and replace every 2 seasons or ~200 hours. In sandy, silty, or shallow operation, replace annually to protect the powerhead.

How often should I change the gear oil?

Change lower unit gear oil every 100 hours or at least once per season, and again after any suspected prop‑shaft seal damage or water intrusion.

What information helps confirm part compatibility?

Provide the full model code, serial number, shaft length (S/L), start/control type (manual/electric, tiller/remote), and a clear photo of the nameplate. Photos of the existing part also help us verify fitment.

Ready to find parts by horsepower, year, and model? Browse our main Yamaha collection for a complete selection of components for your 15HP 2‑Stroke.

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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.
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