Quicksilver 40HP 2-Stroke Outboard Engine Parts

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This page is for Quicksilver 2‑Stroke 40 HP outboard engines. Use it to locate compatible parts and service information, including maintenance tips, common replacement parts, and troubleshooting guidance. You can also browse the main Mercury collection for a wider selection of compatible Quicksilver/OEM‑quality parts. Scroll to the bottom of this page to start browsing parts for this engine, and remember you can use the Filter & Sort controls on the collection pages to narrow results by horsepower, year range, and part category.

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How to Identify Your 40 HP Model

Locate the identity plate: typically on the transom bracket or swivel bracket. It lists the model designation and serial number.
Read the model code: suffix letters often indicate shaft length (S/L/XL), control type (tiller/remote), and sometimes a model year code.
Confirm stroke type: this page applies to 2‑stroke models. If your engine has a crankcase oil sump and oil filter, you likely have a 4‑stroke (see the appropriate collection).
Fueling and lubrication: most 40 HP 2‑strokes are carbureted and either premix (e.g., 50:1) or use oil injection. Verify which your engine uses before ordering service parts.

Engine Overview

40 HP Class 2‑Stroke Outboards (General)

Feature	Description
Configuration	Inline 2‑ or 3‑cylinder, carbureted 2‑stroke with mechanical fuel system
Common Models	General 40 HP 2‑stroke outboards serviced with Quicksilver/OEM‑quality parts
Advantages	Light weight, strong hole‑shot, simple maintenance, widely available service parts
Notes	Verify premix vs. oil‑injection; use ethanol‑safe fuel lines and filters; cooling system service (impeller) is critical for reliability.

Routine Maintenance & Service Parts

Intervals below are general guidelines for 2‑stroke outboards. Always confirm procedures and timing with your official service manual.

Item	Interval*	Remarks	Parts Link
Gear oil (lower unit)	Every 100 hours or annually	Inspect for water intrusion/metal; replace drain/fill gaskets as needed	Lower Unit Seal Kits
Spark plugs	Inspect every 50 hours; replace 100 hours/season	Gap to spec; replace fouled or worn plugs	Spark plug
Fuel filter / water‑separating filter	Every 100 hours or annually	Use ethanol‑rated elements; replace sooner for contaminated fuel	Fuel Filters
Water pump impeller/kit	Every 2–3 seasons or 200 hours	Replace sooner if weak telltale or overheat alarms occur	Water Pump Impeller Rebuild Kits
Anodes (sacrificial)	Inspect every 50 hours; replace when 50% consumed	Choose alloy for your water (zinc/aluminum/magnesium)	Anodes
Oil injection system (if equipped)	Annually	Inspect tank, lines, and pump; bleed per manual; replace brittle hoses	Hoses
Fuel lines & primer bulb	Every 2–3 seasons	Upgrade to ethanol‑safe hose; replace cracked bulbs/connectors	Fuel Connector
Thermostat	Inspect every 2 seasons; replace as needed	A stuck thermostat can cause overheat or cold‑running	Mercury Outboard Parts

Frequently Used Parts Categories

Routine Service: Service & Maintenance Kits
Cooling System: Water pumps
Fuel System: Fuel Filters
Ignition / Electrical: Electrical Items
Corrosion Protection: Anodes
Gearcase Sealing: Lower Unit Seal Kits
Propulsion: Propellers

Common Symptoms & Quick Checks

Symptom	Check First	Related Parts
Weak telltale or overheat alarm	Inspect intake screen for debris; verify strong primer bulb; confirm thermostat operation	Water pump repair kit, impeller, thermostat, intake screen
Hard starting or rough idle	Check spark plug condition/gap; replace fuel filter; ensure fresh fuel and no air leaks in lines	Spark plugs, fuel filter, fuel lines/primer bulb, carburetor kit
Poor acceleration or power loss	Squeeze primer bulb firm; verify fuel pump output; inspect prop for damage/slip	Fuel pump, fuel hoses, carburetor components, propeller
Excessive smoke (2‑stroke)	Confirm correct oil ratio or oil‑injection setting; check for stuck choke/enricher	Spark plugs, fuel system parts, choke/enricher components
Gearcase noise or metal in gear oil	Drain gear oil to inspect; check prop shaft seal and water intrusion	Lower unit seal kit, gear oil drain/fill gaskets, propeller hardware

FAQs

Are parts interchangeable between different years or platforms?

Some service items are shared across multiple years, but many components vary by platform, model code, and serial range. Always verify with your exact model/serial to ensure compatibility.

When should the impeller be replaced?

As a preventative measure every 2–3 seasons or 200 hours, and immediately if the telltale weakens or an overheat is detected. Sandy or silty water may require more frequent service.

How often should lower unit gear oil be changed?

At least annually or every 100 hours. Inspect for milkiness (water) or metallic debris; address seal issues if contamination is found.

What information do you need to confirm part compatibility?

Provide the model designation, serial number, shaft length, control type (tiller/remote), and whether the engine is premix or oil‑injected. Photos of the nameplate and the existing part help ensure a correct match.

Ready to find the right components? Browse the main Mercury collection to filter by horsepower, year, and model.

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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.