Yamaha 2-Stroke 5-90HP Outboard Marine Engine Parts

(0 products)

This page is for Yamaha 2‑Stroke 5–90 HP outboard engines. It helps you find compatible parts and service information, including maintenance tips, commonly replaced components, and troubleshooting guidance. You can also browse the main Yamaha collection. Scroll to the bottom of the 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.

Browse All Yamaha Parts

How to Identify Your 5–90 HP Model

Locate the model/serial plate on the port‑side transom or clamp bracket; a secondary decal is often under the top cowling.
Read the complete model code and suffix. Letters typically indicate shaft length (S ≈ 15 in, L ≈ 20 in), control type (tiller/remote), trim/tilt, and a year code.
For 2‑Stroke engines, confirm whether the engine is premix or oil‑injected (on‑board oil tank and pump). This affects parts and procedures.
Distinguish platforms: portable 5–9.9 HP, midrange 15–40 HP, and inline‑3 50–90 HP. Higher‑output variants may include commercial (C‑series) or jet‑drive versions with different lower‑unit parts.

Platform Overview

Portable 5–9.9 HP 2‑Stroke

Feature	Description
Configuration	Single or twin‑cylinder, carbureted 2‑Stroke outboards; manual or electric start.
Common Models	Typical Yamaha 5–9.9 HP 2‑Stroke portable models (tiller or remote variants).
Advantages	Very light weight, simple maintenance, easy transport, strong low‑speed thrust for dinghies and small boats.
Notes	Verify premix ratio or injection setup; confirm prop hub style and gearcase seal size by model code.

Midrange 15–40 HP 2‑Stroke

Feature	Description
Configuration	Twin‑ or triple‑cylinder carbureted 2‑Stroke; manual/trim‑tilt options depending on model year.
Common Models	Yamaha 15–40 HP 2‑Stroke families used on utility, fishing, and light planing hulls.
Advantages	Good power‑to‑weight ratio and straightforward service; widely supported with aftermarket parts.
Notes	Carb jetting and ignition components can vary by year; verify with full model code and serial.

50–90 HP Inline‑3 2‑Stroke

Feature	Description
Configuration	Inline‑3, carbureted 2‑Stroke outboards with power trim/tilt variants; popular in the 60–90 HP range.
Common Models	Examples include 60/70/90 HP 2‑Stroke inline‑3; commercial C‑series and 90 HP (e.g., 90TLR, C90) variants exist.
Advantages	Light for their output, responsive mid‑range, and broad parts availability.
Notes	Many powerhead items interchange across years, but lower unit, jet‑drive gear, and some rigging parts are model‑specific—confirm via model code.

Routine Maintenance & Service Parts

Intervals below are general guidelines. Always follow the procedures and service intervals in the official Yamaha 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; look for fouling from rich mix or extended idling.	Spark Plugs
Fuel filter / water separator	50–100 hours or each season	Shorten interval with ethanol fuel or contaminated tanks.	Fuel Filters
Water pump impeller / kit	Every 2–3 seasons or ~200 hours	Replace sooner for sandy/silty or shallow operation.	Yamaha Water Pump Repair Kits
Anodes (internal & external)	Inspect often; replace ~50% depleted	Select alloy for salt, brackish, or fresh water.	Yamaha Anodes
2‑Stroke oil‑injection system or premix	Annual inspection	Verify pump output, alarms, and condition of hoses/check valves; confirm premix ratio if applicable.	Yamaha Service & Maintenance Kits
Carburetor synchronization/cleaning	Inspect 100 hours or if idle quality changes	Balance throttle plates; clean jets and passages.	Carburetor Components
Propeller & hardware check	Every trip / inspection	Remove debris; inspect hub; verify correct pitch for load.	Yamaha Propellers

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
Carburetion – Carburetor Components
Gearcase Seals – Yamaha Lower Unit Seal Kits
Corrosion Protection – Yamaha Anodes

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 kit, thermostat, intake screen.
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.	Primer bulb and fuel line, gaskets, carb rebuild kit, spark plugs.
Excessive smoke (2‑Stroke)	Confirm premix ratio or oil‑injection pump setting; check thermostat for stuck‑open (cold running).	Oil pump components, spark plugs, thermostat.
Gearcase noise or metal in gear oil	Verify oil level/condition; check for water intrusion; inspect propshaft seal and bearings.	Lower unit seal kit, bearings, gear oil.

FAQs

Are parts interchangeable between different years or platforms?

Many powerhead components interchange within Yamaha 2‑Stroke families, especially in the 50–90 HP inline‑3 range. However, cowling, lower‑unit/jet‑drive components, and some rigging parts can be model‑specific. Always verify with the full model code and serial.

When should the water pump impeller be replaced?

As preventive maintenance, replace the impeller every 2–3 seasons (about 200 hours). Shorten the interval if operating in sand, silt, or shallow water, or if the telltale weakens.

How often should lower unit gear oil be changed?

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

What information helps confirm part compatibility?

Provide the complete model code and serial number, shaft length, control type (tiller vs remote), and clear photos of the nameplate and existing parts to ensure accurate selection.

Ready to browse by horsepower, year, and model? Start with the main Yamaha collection and filter down to the parts you need.

Shop Yamaha 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.