Mercury 2-Stroke 6-15HP Outboard Engine Parts

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This page supports Mercury 2‑Stroke 6–15HP outboard engines and helps you find compatible parts and practical service information. Below you’ll find maintenance tips, commonly replaced items, and troubleshooting guidance. You can also browse the main Mercury collection. Scroll to the bottom of this page to start browsing parts for this engine, and use the Filter & Sort controls on the collection page to narrow results by horsepower, year range, and part category.

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How to Identify Your 6–15HP Model

Find the nameplate/serial sticker on the transom clamp bracket or swivel bracket. Note the model description and serial number.
Decode suffix letters: S/L/XL often indicate shaft length (Short/Long/Extra‑Long), M/E for manual vs. electric start, and remote vs. tiller control variants.
Confirm the stroke type: these models are carbureted 2‑Stroke; many from the late 1980s onward share similar small gearcase architecture.
Check year/series notes in your service manual; 9.9HP and 15HP typically share many internal components, while 6/8HP variants may differ in carburation and porting.

Engine Overview

Portable 2‑Stroke Series (approx. 1986+)

Feature	Description
Configuration	Small carbureted 2‑Stroke outboards; 9.9/15HP commonly twin‑cylinder; manual or electric start; tiller or remote options.
Common Models	Mercury 6HP, 8HP, 9.9HP, 13.5HP, and 15HP 2‑Stroke models (late 1980s and newer variants).
Advantages	Light weight, simple service, strong low‑speed thrust for small craft and tenders.
Notes	Many 1986+ units share a compact gearcase with thru‑hub exhaust; some parts interchange across 9.9/15HP. Always confirm by serial range and shaft length.

Routine Maintenance & Service Parts

Intervals below are general guidelines for small 2‑Stroke outboards. Always follow the procedures and schedules in your official service manual.

Item	Interval*	Remarks	Parts Link
Gear oil (lower unit)	Every 100 hours or annually	Inspect for water intrusion or metal debris; replace sealing washers.	Mercury Outboard Parts
Spark plugs	Inspect every 50–100 hours; replace as needed	Set correct gap; fouling indicates mixture or oiling issues.	Spark Plug
Inline fuel filter	Every 100 hours or annually	Replace more often if using portable tanks or if fuel contamination is suspected.	Fuel Filters
Water pump impeller/kit	Every 2 seasons (fresh) or annually (salt), or 200 hours	Essential for cooling; replace sooner if weak tell‑tale or overheat alarm occurs.	Mercury Water Pump Repair Kits
Anodes (external & internal)	Inspect every haul‑out; replace when 50% consumed	Match alloy to water type (zinc/aluminum/magnesium).	Anodes
Propeller inspection & hardware	Check every 50 hours or after impact	Remove line, check hub for damage; ensure nut is torqued correctly.	Propellers
Lower unit seals (if leaks found)	As needed after pressure/vacuum test	Milky gear oil indicates water intrusion; reseal before further use.	Mercury Lower Unit Seal Kits
2‑Stroke fuel/oil mixture or oil injection service	Check every outing; verify settings annually	Use the manufacturer‑specified premix ratio if not oil‑injected; service and bleed oil injection systems per the manual.	Mercury Outboard Parts

Frequently Used Parts Categories

Routine Service: Mercury Outboard Parts
Cooling System: Mercury Water Pump Repair Kits
Fuel System: Fuel Filters
Ignition / Electrical: Electrical Items
Corrosion Protection: Anodes
Propulsion: Propellers
Gearcase Sealing: Mercury Lower Unit Seal Kits

Common Symptoms & Quick Checks

Symptom	Check First	Related Parts
Weak tell‑tale stream or overheat alarm	Inspect intake screens for blockage; verify impeller condition; check thermostat if fitted.	Water pump kit, intake screen, thermostat
Poor acceleration or power loss	Check fuel quality and filter; confirm prop condition; inspect plugs for fouling.	Fuel filter, spark plugs, propeller, carb service parts
Hard starting or rough idle	Prime bulb; verify choke/enrichment operation; inspect plug gap and ignition leads.	Spark plugs, fuel filter, ignition components
Excessive smoke (2‑Stroke)	Confirm correct fuel/oil mix; check idle mixture; rule out stuck choke.	Carburetor gaskets/needles, choke components
Gearcase noise or metal in gear oil	Perform pressure/vacuum test; inspect seals and bearings; verify proper lube level.	Lower unit seal kit, bearings, shims, prop hardware

FAQs

Are parts interchangeable between different years or platforms?

Many 9.9HP and 15HP 2‑Stroke models share components, and some items carry across the 6–15HP range. However, changes by year, serial range, shaft length, and start/control type affect compatibility. Always confirm with your serial number.

When should the impeller be replaced?

As a preventive measure, replace the impeller every 2 seasons in fresh water or annually in salt water, or about every 200 hours. Replace immediately if the tell‑tale weakens, the engine overheats, or sand/silt ingestion is suspected.

How often should gear oil be changed?

Change the lower‑unit gear oil every 100 hours or annually. Inspect for water contamination (milky color) or metallic particles, which indicate the need for further diagnosis and possible resealing.

What information do you need to confirm part compatibility?

Please provide the Mercury model description, serial number, shaft length, and whether it’s manual or electric start/tiller or remote. Photos of the nameplate and the part area help verify fitment.

Ready to find parts by horsepower, year, and model? Browse our main Mercury collection to filter and sort the results for your 2‑Stroke 6–15HP outboard.

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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.