Parsun 15-20HP 4-Stroke Outboard Engine Parts

(2 products)

This page focuses on Parsun 15–20HP 4‑Stroke outboard engines. Use it to find compatible parts and service information, including maintenance tips, frequently replaced items, and troubleshooting guidance. You can also browse the main parts collections on our site. Scroll to the bottom to start browsing parts for this engine, and remember you can use the Filter & Sort controls on collection pages to narrow results by horsepower, year range, and part category.

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How to Identify Your 15–20HP Model

Nameplate/serial plate: Typically located on the transom bracket (port/left side) and stamped on the block. Record the full model and serial.
Decoding the suffix: Letters usually indicate shaft length (S/L/XL), start type (M manual/E electric), and control type (tiller vs remote). Match these when selecting parts.
Fuel system differences: Many 15HP units are carbureted, while 20HP models are commonly EFI. Check for a carburetor vs. throttle body, fuel rail, and ECU connectors.
4‑Stroke identifiers: Oil fill/dipstick on the powerhead and an external oil filter canister distinguish these from 2‑Strokes.

Engine / Platform Overview

Parsun 15HP 4‑Stroke (Carbureted)

Feature	Description
Configuration	Inline‑2 4‑Stroke, carbureted induction
Common Models	Examples include manual/electric start, short/long shaft variants (e.g., F15 series such as F15BMS style designations)
Advantages	Light weight, simple fuel system, good portability and fuel economy
Notes	Many service parts interchange with 20HP of similar generation; fuel system parts are carb‑specific

Parsun 20HP 4‑Stroke (EFI)

Feature	Description
Configuration	Inline‑2 4‑Stroke with electronic fuel injection (EFI)
Common Models	Remote/tiller control, manual/electric start, short/long shaft (e.g., F20 series/EFI variants)
Advantages	Improved cold starting, altitude compensation, steady idle, strong mid‑range torque
Notes	Water pump, gearcase seals, anodes, and many tune‑up items are shared with 15HP; EFI‑specific components (injectors, high‑pressure filter, ECU) are unique

Routine Maintenance & Service Parts

Intervals below are general guidelines for small 4‑Stroke outboards. Always follow your official service manual for model‑specific procedures and schedules.

Item	Interval*	Remarks	Parts Link
Engine oil + filter	First 20 hrs, then every 100 hrs or annually	Use marine‑grade 4‑Stroke oil; replace oil filter at each oil change	Oil Filters
Gear oil (lower unit)	Every 100 hrs or annually	Inspect for water (milky oil) and metal; renew gaskets/seals as needed	Lower Unit Seal Kits
Spark plugs	Inspect 100 hrs; replace ~200–300 hrs or as needed	Check gap and condition; replace if fouled or worn	Spark Plugs
Fuel filter / in‑line filter	Every 100 hrs or annually	Replace more often with stale or contaminated fuel; EFI models also have a high‑pressure filter	Fuel Filters
Water pump impeller / kit	Inspect annually; replace every 2–3 seasons (or sooner in sandy/silty water)	Loss of tell‑tale or overheat alarm indicates service is due	Water Pump Impeller Rebuild Kits
Anodes (sacrificial)	Inspect every 50–100 hrs; replace when >50% depleted	Choose zinc, aluminum, or magnesium to match your water type	Anodes

Frequently Used Parts Categories

Routine Service: Service & Maintenance Kits
Cooling System: Water Pump Impeller Rebuild Kits
Fuel System: Fuel Filters and Fuel Pumps
Ignition / Electrical: Electrical Items and Spark Plugs
Propulsion: Propellers
Corrosion Protection: Anodes
Gearcase Sealing: Lower Unit Seal Kits

Common Symptoms & Quick Checks

Symptom	Check First	Related Parts
Weak tell‑tale or overheat alarm	Inspect intake screen, tell‑tale nozzle, and thermostat; verify impeller condition	Water pump kit, thermostat, intake screen
Hard starting / rough idle	Check spark plug condition and gap; for carb models, clean jets; for EFI, confirm battery voltage and fuel pressure	Spark plugs, fuel filter, carb cleaner kit, EFI filter/injector service
Poor acceleration / power loss	Look for prop damage or excessive pitch, restricted fuel flow, or fouled plugs; verify throttle opens fully	Propeller, fuel filter, spark plugs
Gearcase noise or metal in gear oil	Check gear oil level/condition; inspect for water intrusion at seals; look for fishing line on propshaft	Lower unit seal kit, gear lube, propshaft seal

FAQs

Are parts interchangeable between 15HP and 20HP models?

Across the same generation, many service items (impellers, anodes, some ignition and gearcase parts) interchange. Fuel‑system components differ: carburetor parts for 15HP vs. EFI components for 20HP. Always verify by model/serial and suffix.

When should I replace the water pump impeller?

Inspect annually and replace every 2–3 seasons (or sooner if you run sandy/silty water, have weak tell‑tale flow, or after any overheat event).

How often should I change gear oil?

At least every 100 hours or once per season. If the oil appears milky or you see metal debris, service immediately and inspect/renew seals.

What information helps confirm part compatibility?

Provide the full model code and serial number, shaft length, start/control type, and a clear photo of the nameplate. Photos of the existing part (and mounting surfaces) also help.

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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.