Yamaha 2-Stroke 135-300HP Outboard Marine Engine Parts

(1 products)

This page is for Yamaha 2-Stroke 135–300HP outboard engines. Use it to find compatible parts and key service information. Below you’ll find maintenance tips, common replacement parts, and troubleshooting guidance. You can also browse our main Yamaha collection at any time. Scroll to the bottom of this page to start browsing parts for this engine, and remember that on the collection page you can use the Filter & Sort controls to narrow by horsepower, year range, and part category.

Browse All Yamaha Parts

How to Identify Your 135–300HP Model

Nameplate location: Look on the transom bracket or swivel bracket (typically port side) for the model/serial plate.
Reading the code: Yamaha model codes include horsepower and suffix letters for shaft length (S/L/X/U), control type (remote/tiller), and a year code.
Platform clues: Cowling decals may indicate OX66 EFI or HPDI. HPDI engines use high-pressure fuel systems and dedicated filters; earlier V6 carb/OX66 engines have separate fuel pumps and vapor separator arrangements.
Confirming details: Note the full model code, serial number, and any tag on the engine’s electrical/fuel components to verify parts compatibility.

Platform Overview

V6 Carb / OX66 EFI (typ. 135–225HP)

Feature	Description
Configuration	V6 2-stroke, carbureted or OX66 EFI, midsize to large displacement.
Common Models	Typical Yamaha V6 two-stroke 135/150/175/200/225 variants; some with OX66 EFI badging depending on year.
Advantages	Strong mid-range torque with broad parts availability; straightforward routine service.
Notes	Fuel and ignition components may differ between carb and EFI versions; verify by model code and component tags before ordering.

V6 HPDI (typ. 200–300HP)

Feature	Description
Configuration	V6 2-stroke High Pressure Direct Injection (HPDI), commonly early-to-late 2000s.
Common Models	HPDI 200/225/250/300 series; 3.1L and 3.3L variants are typical in this range.
Advantages	High output with improved fuel delivery control; strong top-end performance.
Notes	Requires clean fuel and proper filter maintenance. Some electrical and fuel system parts are HPDI-specific—check part labels and year range.

Routine Maintenance & Service Parts

Intervals below are general guidelines for Yamaha 2-stroke outboards; always confirm procedures and schedules with your official service manual.

Item	Interval*	Remarks	Parts Link
Gear oil (lower unit)	Every 100 hrs or annually	Inspect for water intrusion/metal; replace seals if contamination is found.	Yamaha Lower Unit Seal Kits
Spark plugs	100 hrs (inspect sooner for fouling)	Use the plug type specified for your platform (carb/OX66 vs HPDI may differ).	Spark Plugs
Fuel filter(s)	100 hrs or as needed	Replace primary/inline filters regularly; HPDI models also have high-pressure and VST-related filtration.	Fuel Filters
Water pump impeller/kit	Annually or 100 hrs (inspect mid-season for heavy use)	Essential for cooling and overheat prevention; replace housing if scored.	Yamaha Water Pump Repair Kits
Anodes (external & internal)	Inspect every 50 hrs; replace when 50% depleted	Protects against corrosion; match alloy to water type (salt, brackish, fresh).	Yamaha Anodes
Oil injection system service	200–300 hrs or per manual	Inspect/clean tank screens, lines, and verify pump synchronization; if premix model, follow the specified ratio.	Yamaha Outboard Parts

Frequently Used Parts Categories

Routine Service – Yamaha Service & Maintenance Kits
Cooling System – Yamaha Water Pump Repair Kits
Fuel System – Fuel Filters | Fuel Pumps
Ignition / Electrical – Yamaha Starters | Rectifiers | Sensors
Propulsion – Yamaha Propellers | Propeller Guards | Lower Unit Seal Kits
Controls & Switches – Ignition Switch | Electrical Items
Corrosion Protection – Yamaha Anodes

Common Symptoms & Quick Checks

Symptom	Check First	Related Parts
Weak telltale stream / overheat alarm	Inspect intake screens for debris, water pump wear, and thermostat operation.	Water pump kit, intake screens, thermostats, gaskets, anodes.
Hard starting / rough idle	Check primer bulb, fuel quality, filters, and spark plug condition; verify choke/enrichment.	Spark plugs, fuel filters, fuel pump diaphragm/assembly, enrichment solenoid components.
Poor acceleration / power loss	Inspect prop for damage, verify throttle/spark timing sync, and check for fuel restriction.	Propeller, fuel filters, fuel pump, sensors (TPS/MAP), ignition components.
Excessive smoke (2-stroke)	Verify oil injection settings and thermostat function; confirm fuel quality and plug heat range.	Spark plugs, thermostats, oil injection lines/filters, fuel filter.
Gearcase noise / metal in gear oil	Drain and inspect gear oil; check for water intrusion and seal damage.	Lower unit seal kit, bearings, shims, carrier seals.

FAQs

Are parts interchangeable between different years or platforms?

Some components interchange across multiple years, but fuel and ignition parts often differ between carb/OX66 and HPDI platforms. Always confirm by full model code and serial number before ordering.

When should the impeller be replaced?

Replace the impeller annually or every 100 hours. In sandy or silty waters, check it mid-season and replace sooner if wear is evident.

How often should gear oil be changed?

Change gear oil every 100 hours or annually. If the oil appears milky or has metal debris, service the seals and internal components before further use.

What information do you need to confirm part compatibility?

Provide the complete model code, serial number, horsepower, shaft length, and any identifying decals (e.g., OX66 or HPDI). Photos of the nameplate and the part needing replacement are especially helpful.

Ready to find parts by horsepower, year, and model? Browse our main Yamaha selection to get the right fit for your 2-stroke 135–300HP outboard.

Shop Yamaha Outboard Parts

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.