Yamaha 2-Stroke 20-90HP Outboard Marine Engine Parts

(1 products)

This page is dedicated to Yamaha 2-Stroke 20–90HP outboard engines. Use it to find compatible parts and practical service information, including maintenance tips, common replacement items, and troubleshooting guidance. You can also browse the main Yamaha catalog for more options. Scroll to the bottom to start browsing parts for this engine, and remember you can use the “Filter & Sort” controls on the collection page to narrow results by horsepower, year range, and part category/section.

Browse All Yamaha Parts

How to Identify Your 20–90HP Model

Locate the nameplate/serial plate on the transom bracket (usually on the port side). Record the full model code and serial number.
Reading the model code: letters commonly indicate trim/tilt and start (E/M/P/T), control type (H tiller, R remote), shaft length (S 15", L 20", X 25", U 30"), and a year code letter. The numeric portion shows horsepower.
Platform cues: 20–30HP models are typically inline‑2 carbureted 2‑strokes; most 40–90HP models are inline‑3 carbureted 2‑strokes. Later units may have oil‑injection; older models can be premix.
Check the cowling decals and intake covers for sub‑series markings and verify against the nameplate for exact parts compatibility.

Platform Overview

Small 2‑Stroke Platform (20–30HP)

Feature	Description
Configuration	Inline‑2, carbureted 2‑stroke; manual or electric start; tiller or remote options.
Common Models	Example codes include 25ELG (legacy), 25MS/ML, 20MS/ML variants.
Advantages	Light weight, simple maintenance, easy starting when tuned correctly.
Notes	Verify oiling method: premix vs. oil‑injection. Jetting and gear ratios may vary by region/year.

Midrange 2‑Stroke Platform (40–90HP)

Feature	Description
Configuration	Inline‑3, carbureted 2‑stroke; remote controls common; power trim & tilt on many models.
Common Models	Examples: 40TLR/50TLR, 70TLR, 90TLR and similar suffix variations for shaft/control/year.
Advantages	Strong mid‑range torque, straightforward carb service, widely supported parts availability.
Notes	Carb sync and link‑and‑sync specs vary by model year. Some models use oil‑injection tanks and pumps—inspect lines and filters periodically.

Routine Maintenance & Service Parts

Intervals below are general guidelines for Yamaha 2‑stroke outboards. Always follow the schedule and procedures in your engine’s official service manual.

Item	Interval*	Remarks	Parts Link
Gear oil (lower unit)	Every 100 hours or annually	Change sooner if oil appears milky or contaminated; check drain/fill gaskets.	Yamaha Outboard Parts
Spark plugs	Inspect every 50 hours; replace ~100 hours	Use correct heat range and gap; differences by model/year.	Spark Plugs
Fuel filter / inline filter	Inspect 50 hours; replace 100 hours	Check for water/debris; replace clogged or aged filters.	Fuel Filters
Water pump impeller / kit	Every 2–3 seasons or 200 hours	Replace sooner if weak telltale or overheat occurs; inspect housing & key.	Yamaha Water Pump Repair Kits
Anodes (sacrificial)	Inspect each season; replace when 50% eroded	Use correct alloy for fresh/brackish/salt; keep clean and unpainted.	Yamaha Anodes
2‑Stroke oiling	Every service	If premix, use TC‑W3 at the specified ratio (often 50:1). If oil‑injection, inspect tank, lines, filter/screen, and bleed per manual.	Yamaha Outboard Parts
Fuel hoses / primer bulb	Inspect each season	Replace aged, cracked, or ethanol‑damaged lines; verify proper bulb check‑valve operation.	Hoses
Propeller & hardware	Inspect 50 hours; remove annually	Check for dings, hub slippage, fishing line at seals; grease splines.	Yamaha Propellers
Gearcase seals (if leak suspected)	Pressure/vac test as needed	Milky gear oil or water intrusion indicates seal service.	Yamaha Lower Unit Seal Kits

Frequently Used Parts Categories

Routine Service: Yamaha Service & Maintenance Kits
Cooling System: Yamaha Water Pump Repair Kits
Fuel System: Fuel Filters and Hoses
Ignition / Electrical: Electrical Items
Propulsion: Yamaha Propellers
Corrosion Protection: Yamaha Anodes
Gearcase Service: Yamaha Lower Unit Seal Kits

Common Symptoms & Quick Checks

Symptom	Check First	Related Parts
Weak telltale or overheat alarm	Inspect intake screens, thermostat, and impeller condition; verify telltale hose is clear.	Water pump kit, thermostat, intake screen, hoses
Poor acceleration / power loss	Check fuel quality, filter restriction, spark plug condition, and carb synchronization.	Fuel filter, spark plugs, carb gaskets/jets, hoses
Hard starting / rough idle	Verify choke/prime operation, plug gap, and air leaks on fuel lines; inspect reed valves if applicable.	Spark plugs, fuel hoses, gaskets, primer bulb
Excessive smoke (2‑stroke)	Confirm correct oil ratio; inspect oil‑injection lines for leaks; check stuck choke or flooded carbs.	Hoses, carb gaskets/needle & seat, oil tank components
Gearcase noise / metal in gear oil	Drain and inspect oil; check for water intrusion; perform pressure/vac test of gearcase.	Lower unit seal kit, drain/fill gaskets, bearings

FAQs

Are parts interchangeable across different years or platforms?

Some 2‑stroke Yamaha midrange models share components, but many parts are year‑ and model‑specific. Always confirm with the full model code and serial number before ordering.

When should I replace the impeller?

As a rule of thumb, replace the impeller every 2–3 seasons or ~200 hours, and sooner if the telltale weakens, you run sandy/shallow water, or you experience an overheat.

How often should I change the gear oil?

Change the lower unit gear oil every 100 hours or once per year. If the oil looks milky or smells burnt, service immediately and check seals.

What information do you need to confirm part compatibility?

Please provide the complete model code, serial number, horsepower, approximate year, shaft length, and any notable options (tiller/remote, trim/tilt). Photos of the nameplate and the part needing replacement are very helpful.

Ready to find parts for your Yamaha 2‑Stroke 20–90HP? Browse the main Yamaha collection and filter by horsepower, year, and model.

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.