Yamaha 90HP 2-Stroke Outboard Engine Parts

(73 products)

This page is dedicated to Yamaha 2‑Stroke 90 HP outboard engines. It helps you find compatible parts and service information, with maintenance tips, commonly replaced components, and troubleshooting guidance. You can also browse the main Yamaha collection. 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 results by horsepower, year range, and part category/section.

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How to Identify Your 90 HP Model

Locate the model/serial plate on the port-side transom bracket or clamp bracket. A secondary decal is often found under the top cowling.
Read the full model code and suffix (for example, 90TLRY). The numbers indicate horsepower; letters typically note features such as shaft length (L ≈ 20 in), control/trim configuration, and a year code suffix.
For 2‑Stroke models, check whether the engine is oil‑injected (on‑board oil tank and pump) or premix; this affects maintenance and parts selection.
Distinguish platform variants: standard 90, C90 (commercial variant), and 90JET (jet‑drive). Jet models use a pump instead of a propeller gearcase and require different lower‑unit parts.

Platform Overview

Standard 90 (e.g., 90TLR / 90TLRY)

Feature	Description
Configuration	Inline‑3, carbureted 2‑Stroke outboard with power trim/tilt variants
Common Models	Examples include 90TLR, 90TLRY (c. 2000 model year), and other 90T‑series models
Advantages	Light weight, responsive mid‑range, straightforward carbureted service
Notes	Many powerhead gaskets, ignition components, and service items are shared across year codes; verify by model code and serial.

C90 and 90JET Variants

Feature	Description
Configuration	Inline‑3, carbureted 2‑Stroke; C90 is a commercial‑duty variant; 90JET uses a jet pump instead of a propeller gearcase
Common Models	C90 series, 90JET series (shares powerhead with standard 90)
Advantages	C90: durable, simplified trim/cowling options; 90JET: shallow‑water capability
Notes	Most powerhead parts interchange with standard 90, but lower‑unit, pump/impeller, and some rigging components are variant‑specific.

Routine Maintenance & Service Parts

Intervals below are general guidelines. Always confirm procedures and intervals with the official service manual for your exact model code.

Item	Interval*	Remarks	Parts Link
Gear oil (lower unit)	Every 100 hours or annually	Inspect for water or metal; replace sealing washers if disturbed	Yamaha Lower Unit Seal Kits
Spark plugs	Inspect 50 hours; replace annually or as needed	Check gap and signs of fouling from rich mix or extended idling	Spark Plugs
Fuel filter / water separator	50–100 hours or each season	Replace more often with ethanol fuel or contaminated tanks	Fuel Filters
Water pump impeller / kit	Every 2–3 seasons or 200 hours	Shorten interval for sandy/silty or shallow operation	Yamaha Water Pump Repair Kits
Anodes (internal & external)	Inspect often; replace when ~50% depleted	Use correct alloy for your water (salt, brackish, fresh)	Yamaha Anodes
Oil‑injection system (2‑Stroke)	Annual inspection	Verify pump output, alarms, and condition of hoses/check valves	Yamaha Oil Seals
Carburetor synchronization/cleaning	Inspect 100 hours or if idle quality changes	Balance throttle plates; clean jets and passages	Carburetor Parts
Propeller & hardware check	Every trip/inspection	Remove debris, check hub, and verify correct pitch for load	Yamaha Propellers

Common Symptoms & Quick Checks

Symptom	Check First	Related Parts
Weak telltale or overheat alarm	Inspect intake screens, thermostat, and water pump impeller; verify telltale hose is clear	Water pump repair kit, thermostat, intake screen, poppet valve
Poor acceleration or power loss	Check prop damage/slip, fuel filter restriction, carb jetting/cleanliness, spark plug condition	Propeller, fuel filter, carburetor kit, spark plugs
Hard starting or rough idle	Verify enrichment/choke function, primer bulb/lines, air leaks, and carb synchronization	Carb rebuild kit, fuel lines/primer bulb, gaskets, spark plugs
Excessive smoke (2‑Stroke)	Confirm premix ratio if applicable, or oil‑injection pump setting; check thermostat for stuck‑open (cold running)	Spark plugs, oil pump components, thermostat
Gearcase noise or metal in gear oil	Check oil level/condition, inspect for water intrusion, verify propshaft seal and bearing condition	Lower unit seal kit, bearings, shims, gear oil

FAQs

Are parts interchangeable between different years or platform variants?

Many powerhead components interchange across 90 HP 2‑Stroke model years and between standard 90 and C90 variants. However, items like cowling, lower unit, jet pump/gearcase, and some rigging parts can be model‑specific. Confirm using your full model code and serial.

When should I replace the water pump impeller?

As a preventive measure, replace the impeller every 2–3 seasons (or about 200 hours). Shorten the interval if you operate in sandy/silty water, beach frequently, or see a weak telltale stream.

How often should lower unit gear oil be changed?

Change gear oil at least annually or every 100 hours. If the oil looks milky or metallic, service the seals and inspect internal components before further use.

What information do you need to confirm part compatibility?

Provide the complete model code and serial number, shaft length, control type (tiller vs. remote), and any identifying photos of the nameplate and existing parts. This ensures accurate parts selection.

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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.