EMP 20HP Outboard Marine Engine Parts

(0 products)

This page is focused on EMP 20HP outboard engines and helps you find compatible replacement parts and practical service information. Below you’ll find maintenance tips, frequently used parts, and troubleshooting guidance. You can also browse our main brand collections such as Yamaha, Suzuki, and Johnson/Evinrude. Scroll to the bottom to start browsing parts for this engine, and remember you can use the collection page’s “Filter & Sort” tools to narrow by horsepower, year range, and part category.

Browse Popular Outboard Parts

How to Identify Your 20HP Model

Locate the nameplate/serial plate on the transom bracket or swivel bracket. It lists model code, serial number, and often shaft length.
Model code suffixes typically indicate shaft length (S=15", L=20", XL=25"), start/control type (manual/electric, tiller/remote), and sometimes year code.
2‑Stroke vs 4‑Stroke: 4‑strokes have an engine oil fill cap and dipstick; 2‑strokes rely on premix or an oil‑injection reservoir (no crankcase oil dipstick).
Count cylinders and note induction: most 20HP platforms are twin‑cylinder; older units are carbureted 2‑stroke, while newer are 4‑stroke EFI/carbureted.

Platform Overview

20HP 2‑Stroke Twin‑Cylinder

Feature	Description
Configuration	Inline‑2 carbureted 2‑stroke; lightweight and simple cooling/fuel systems.
Common Models	20HP 2‑stroke twin‑cylinder models across major brands (tiller or remote, short/long shaft).
Advantages	Light weight, quick throttle response, simple maintenance.
Notes	Verify water pump kit and gearcase parts by shaft length and serial. EMP aftermarket parts commonly cover impellers, gaskets, fuel filters, and seals.

20HP 4‑Stroke Twin‑Cylinder

Feature	Description
Configuration	Inline‑2 4‑stroke, carbureted or EFI; crankcase oil and spin‑on or cartridge oil filter.
Common Models	20HP 4‑stroke twin‑cylinder models with manual/electric start and tiller/remote variants.
Advantages	Low fuel consumption, quiet idle, clean emissions.
Notes	Match oil filter style (spin‑on vs cartridge) and fuel system (EFI vs carb) when selecting service parts. Cooling and gearcase parts often cross with related HP models; confirm by serial.

Routine Maintenance & Service Parts

Intervals below are general guidelines for small outboards; always follow the official service manual for your exact model and operating conditions.

Item	Interval*	Remarks	Parts Link
Engine oil + filter (4‑Stroke only)	100 hours or annually	Warm engine, change oil and replace filter; verify filter style.	Oil Filters
Gear oil (lower unit)	100 hours or annually	Drain while warm; inspect for water or metal; replace gaskets.	Lower Unit Seal Kits
Spark plugs	100 hours or annually	Inspect gap and insulator color; replace if fouled or worn.	Spark Plugs
Fuel filter / water‑separating filter	100 hours or annually	Replace more often with ethanol fuel or contaminated fuel.	Fuel Filters
Water pump impeller / kit	Every 2 seasons (annually in sandy/silty water)	Restore cooling performance; inspect housing and wear plate.	Water Pump Impeller Rebuild Kits
Anodes (zincs)	Inspect every 50 hours; replace when 50% consumed	Choose material for your water type (zinc/aluminum/magnesium).	Anodes
Thermostat & gasket	Inspect annually; replace 2–3 seasons or if overheat issues	Ensures proper operating temp; replace gasket/seal on service.	Gaskets
2‑Stroke oiling check (2‑Stroke only)	Every service	Confirm premix ratio or oil‑injection pump/linkage calibration and hose condition.	Service & Maintenance Kits

Frequently Used Parts Categories

Routine Service – Service & Maintenance Kits
Cooling System – Water Pumps and Impellers
Fuel System – Fuel Filters and Fuel Pumps
Ignition / Electrical – Electrical Items and Starters
Propulsion – Propellers and Propeller Guards
Sealing & Gaskets – Gaskets and Lower Unit Seal Kits
Corrosion Protection – Anodes

Common Symptoms & Quick Checks

Symptom	Check First	Related Parts
Weak tell‑tale stream / overheat alarm	Inspect intake screens for blockage, verify hose pressure when flushing, and check thermostat operation.	Water pump kit, impeller, thermostat, intake screen
Poor acceleration / power loss	Check propeller for damage/slip, confirm fresh fuel, and inspect/replace fuel filter and spark plugs.	Propeller, fuel filter, spark plugs
Hard starting / rough idle	Prime the bulb, verify choke/enrichment, clean carburetor (if equipped), and check plug gap.	Spark plugs, fuel filter, carburetor kit
Excessive smoke (2‑Stroke)	Verify premix ratio or oil‑injection calibration; ensure thermostat closes and idle mixture is correct.	Spark plugs, thermostat, hoses
Gearcase noise / metal in gear oil	Confirm oil level, check for water intrusion, and inspect prop shaft seals.	Lower unit seal kit, bearings, propeller hardware

FAQs

Are parts interchangeable between different years or platforms?

Some items (anodes, spark plugs, impellers) may cross between years, but many components vary by model code, serial number, shaft length, and whether the engine is 2‑stroke or 4‑stroke. Always verify fitment using your model/serial or current part number.

When should the impeller be replaced?

Replace at least every two seasons, or annually if you run in sandy/silty water or see a weak tell‑tale stream or high temperature alarms. Replace the full water pump kit if the wear plate or housing is scored.

How often should lower unit gear oil be changed?

Every 100 hours or at the end of each season. Drain when warm, look for water or metal on the magnet, and renew sealing washers or a seal kit if contamination is found.

What information helps confirm part compatibility?

Provide the model code, serial number, shaft length (S/L/XL), start/control type, 2‑stroke or 4‑stroke, and any existing part numbers. Photos of the nameplate and the old part are also helpful.

Ready to find what you need? Browse our main brand collections by horsepower, year, and model to locate the right parts for your 20HP outboard.

Start Browsing 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.