Yamaha 2-Stroke Outboard Marine Engine Parts

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This page is for Yamaha 2‑Stroke outboard engines. Use it to find compatible parts and service information, including maintenance tips, common replacement parts, and troubleshooting guidance. You can also browse the main Yamaha collection for a wider selection. 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 Yamaha 2‑Stroke Model

Nameplate location: Look for the model/serial plate on the transom clamp bracket or the swivel bracket. It includes the model code, shaft length, and serial number.
Reading the code: Numbers indicate horsepower; suffix letters note features. Common letters: S=15" shaft, L=20", X=25", U=30"; R=remote controls, H=tiller; E=electric start, M=manual start; T=power trim & tilt, P=power tilt.
Platform clues: 2‑Stroke models range from small carbureted twins/triples to larger V4/V6, including EFI (OX66) and HPDI variants. Oil‑injected models have an engine/remote oil tank; some portables are premix.
For parts accuracy: Confirm horsepower, full model code, shaft length, and serial prefix before ordering.

Platform Overview

Portable & Midrange 2‑Stroke (approx. 2–90 HP)

Feature	Description
Configuration	Inline 1–3 cylinder, carbureted 2‑Stroke; manual or electric start; tiller or remote controls.
Common Models	Typical 25/40/50/70/90 HP 2‑Stroke models (various shaft lengths and control options).
Advantages	Light weight, simple maintenance, excellent power‑to‑weight, easy service access.
Notes	Confirm premix vs. oil‑injection. Many parts vary by shaft length, control type, and year code.

High‑Output 2‑Stroke (approx. 115–250 HP)

Feature	Description
Configuration	V4/V6 2‑Stroke, including carbureted, OX66 EFI, and HPDI fuel systems.
Common Models	115/130 (V4) and 150/175/200/225/250 (V6), including performance series like VMAX.
Advantages	Strong hole‑shot and mid‑range torque; proven durability for offshore and bass applications.
Notes	Fuel and ignition parts differ by injection type. Verify model code, year letter, and gearcase style before ordering.

Routine Maintenance & Service Parts

Intervals below are general guidelines for typical Yamaha 2‑Stroke use. Always follow the procedures and schedules in your engine’s official service manual.

Item	Interval*	Remarks	Parts Link
Gear oil (lower unit)	100 hours or annually	Inspect for metal or water; replace sealing washers; check for leaks.	Yamaha Outboard Parts
Spark plugs	100 hours or annually	Check condition and gap; replace if fouled or worn.	Spark Plugs
Fuel filter / in‑line filter	100 hours or each season	Replace if contaminated; drain water separators regularly.	Fuel Filters
Water pump impeller / kit	2–3 years or 200 hours	Replace sooner if weak tell‑tale or overheat occurs; inspect housing and wear plate.	Yamaha Water Pump Repair Kits
Anodes (external & internal)	Inspect often; replace at ~50% loss	Choose material for your water type; ensure good metal‑to‑metal contact.	Yamaha Anodes
Oil injection system service (if equipped)	Annually	Inspect tanks/lines, strainers and filters; test alarms; bleed system per manual.	Yamaha Outboard Parts
Propeller & hub inspection	Each trip; remove seasonally	Check for dings and line on the shaft; grease splines; verify pitch for target RPM.	Yamaha Propellers
Lower unit seal replacement (as needed)	On water intrusion or during rebuild	Replace propshaft/driveshaft/input seals and O‑rings; pressure test after assembly.	Yamaha Lower Unit Seal Kits
Fuel/oil mix (premix models)	Every refuel	Use the ratio specified in your manual (commonly 50:1 TC‑W3); do not premix on oil‑injected engines.	Yamaha Outboard Parts

*Intervals are general references. Always follow your Yamaha service manual and adjust for duty cycle and environment.

Frequently Used Parts Categories

Routine Service: Yamaha Service & Maintenance Kits
Cooling System: Yamaha Water Pump Repair Kits
Gearcase & Seals: Yamaha Lower Unit Seal Kits
Propellers & Hubs: Yamaha Propellers
Ignition / Starting: Yamaha Starters
Gaskets & Sealing: Yamaha Gaskets
Corrosion Protection: Yamaha Anodes

Common Symptoms & Quick Checks

Symptom	Check First	Related Parts
Weak tell‑tale or overheat alarm	Inspect intake screens for blockage; verify thermostat operation; check impeller condition and key.	Water pump kit, thermostat, intake screen, gaskets
Poor acceleration / power loss	Confirm prop condition and pitch; drain stale fuel; replace clogged fuel filter; inspect plugs and timing.	Propeller, fuel filter, spark plugs, gasket sets
Hard starting / rough idle	Prime fuel system; check for air leaks at connectors/hoses; clean idle circuits; verify choke/enrichment.	Fuel connectors, hoses, spark plugs, carb gaskets
Excessive smoke (2‑Stroke)	Verify premix ratio or oil‑pump setting; check thermostat (cold running increases smoke); confirm plug heat range.	Spark plugs, thermostat, oil‑injection components
Gearcase noise / metal in gear oil	Check oil level/condition; inspect for fishing line on propshaft; pressure/vacuum test seals and bearings.	Lower unit seal kit, bearings, prop shaft seal

FAQs

Are Yamaha 2‑Stroke parts interchangeable across years and platforms?

Many fasteners and service items are shared, but key components (cooling, fuel, ignition, gearcase, and controls) often change by model year, shaft length, and fuel‑system type (carbureted vs. EFI/HPDI). Always match parts using the full model code and serial.

When should I replace the water pump impeller?

As preventative maintenance, replace every 2–3 seasons or ~200 hours, and sooner if you see a weak tell‑tale, overheat, or sand/silt use. Inspect the housing and wear plate and renew as needed.

How often should I change lower unit gear oil?

Change at least annually or every 100 hours. Inspect the drained oil for milkiness (water) or metallic debris. If contamination is present, service seals and pressure‑test the gearcase.

What information helps confirm part compatibility?

Provide the full model code, serial number, horsepower, shaft length, control type (tiller/remote), and a clear photo of the nameplate. For fuel‑injected models, note OX66 or HPDI where applicable.

Ready to find the right components? Browse the main Yamaha collection and filter by horsepower, year, and model to locate the parts you need.

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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.