Selva 2-Stroke 40HP Outboard Marine Engine

(1 products)

This page is for Selva 2‑Stroke 40 HP outboard engines. Use it to find compatible parts and practical service information. Below you’ll find maintenance tips, common replacement parts, and troubleshooting guidance. You can also browse our main parts collections by category, and at the bottom of this page you’ll find a quick link to start shopping. On the collection pages, use the Filter & Sort controls to narrow results by horsepower, year range, and part category.

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How to Identify Your 40 HP Model

Locate the engine nameplate/serial plate on the swivel bracket or clamp bracket. Record the model designation, serial number, and any suffix letters.
Model suffixes typically denote shaft length (S/L), starting system (manual/electric), and control type (tiller/remote). Match these when selecting parts.
This 40 HP class is a 2‑stroke twin. It’s lighter than 4‑stroke versions and uses premix or oil‑injection. Confirm which oiling system your engine uses.
Measure driveshaft housing to cavitation plate to confirm shaft length (short vs. long) before ordering gearcase, propeller, and water‑pump parts.

Engine Overview

Selva 40 HP 2‑Stroke Twin

Feature	Description
Configuration	Inline 2‑cylinder, loop‑charged carbureted 2‑stroke with CDI ignition; short and long‑shaft variants; manual or electric start depending on model.
Common Models	40 HP 2‑Stroke models in S (short) and L (long) shaft configurations, tiller or remote‑control versions.
Advantages	Light weight, responsive acceleration, simple maintenance, and widely available wear‑item parts.
Notes	Confirm shaft length, starting system, and oiling method (premix vs. oil‑injection) for best parts compatibility. Water pump service parts and propellers commonly vary by shaft length and gearcase.

Routine Maintenance & Service Parts

Intervals below are general guidelines for typical recreational use. Always follow the official service manual for your specific model year and configuration.

Item	Interval*	Remarks	Parts Link
Gear oil (lower unit)	Every 100 hours or annually	Inspect for water intrusion and metal debris; replace drain/fill gaskets when serviced.	Lower Unit Seal Kits
Spark plugs	Inspect every 50 hours; replace 100 hours/annual	Check gap and color; replace if fouled or worn.	Spark Plugs
Fuel filter / water‑separating filter	100 hours or annually; sooner with stale/contaminated fuel	Replace and purge air; monitor for water in bowl if equipped.	Fuel Filters
Water pump impeller / kit	Every 2 seasons or 200 hours (inspect annually)	Replace sooner if tell‑tale is weak or after sand/silt operation.	Water Pump Impeller Rebuild Kits
Anodes (zincs)	Inspect every 50 hours; replace when 50% consumed	Choose alloy for your water (aluminum for brackish/salt, magnesium for fresh).	Anodes
Propeller inspection & hardware	Check each outing; remove annually for service	Remove fishing line, inspect hub, and verify nut/cotter or washer condition.	Propellers
2‑Stroke oiling (premix or injection)	Each refuel / seasonal check	Premix at the specified ratio or service oil‑injection lines/filter; inspect for leaks.	Fuel & Oil Hoses
Electrical connections / starter circuit	Seasonally	Clean and tighten battery cables and grounds; check starter engagement.	Electrical Items

Frequently Used Parts Categories

Routine Service — Service & Maintenance Kits
Cooling System — Water Pumps
Fuel System — Fuel Filters and Fuel Pumps
Ignition / Electrical — Electrical Items and Starters
Propellers & Hardware — Propellers
Gearcase Seals — Lower Unit Seal Kits
Corrosion Protection — Anodes

Common Symptoms & Quick Checks

Symptom	Check First	Related Parts
Weak tell‑tale or overheat alarm	Inspect intake screens for blockage; verify water pump output; check thermostat operation.	Water pump kit, intake screen, thermostat, gaskets, tell‑tale hose.
Hard starting or rough idle	Confirm fresh fuel and correct premix; inspect plugs and choke/enrichment function; check for air leaks.	Spark plugs, fuel filter, carburetor kit, fuel hoses and clamps.
Poor acceleration or power loss	Inspect prop damage/hub, fuel restriction, and throttle linkage; verify full‑throttle RPM.	Propeller, fuel pump, fuel filters, ignition components.
Excessive smoke (2‑stroke)	Verify oil ratio; check for stuck choke or flooded carb; prolonged idling can increase visible smoke.	Spark plugs, carburetor needle/seat, oil‑injection components (if equipped).
Gearcase noise or metal in gear oil	Drain oil and inspect; check prop shaft for fishing line; pressure/vacuum test seals.	Seals, bearings, gear oil, prop shaft seal kit.

FAQs

Are parts interchangeable between different years or platforms?

Some wear items cross over, but many components differ by model code, shaft length, starting system, and control type. Always confirm using the nameplate data and compare dimensions before ordering.

When should the impeller be replaced?

Inspect yearly and replace about every 2 seasons or 200 hours. Replace sooner after running in sand/silt or if the tell‑tale is weak or overheating occurs.

How often should I change the gear oil?

Typically every 100 hours or annually, and any time you see milky oil or metal debris. Replace drain/fill gaskets each service and check seals if water intrusion is found.

What information do you need to confirm part compatibility?

The model designation, serial number, shaft length (S/L), starting system (manual/electric), and whether the engine is premix or oil‑injected. A photo of the nameplate and the part to be replaced is very helpful.

Ready to find parts for your Selva 2‑Stroke 40 HP? Browse by category and use Filter & Sort to narrow results by horsepower, year, and part type.

Start Shopping 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.