Parsun 25HP 2-Stroke Outboard Engine Parts

(2 products)

This page focuses on Parsun 2‑Stroke 25HP outboard engines. It helps you identify compatible parts and find service information, with maintenance tips, common replacement parts, and troubleshooting guidance. You can also browse our main Parsun parts categories and scroll to the bottom of this page to start browsing parts for this engine. On the collection pages, use the “Filter & Sort” controls to narrow results by horsepower, year range, and part category/section.

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How to Identify Your 25HP Model

Find the nameplate/serial sticker on the transom bracket or swivel bracket. It typically lists model designation, serial number, and shaft length.
Model codes and suffix letters often indicate shaft length (S/L/XL), tiller vs. remote control, and electric vs. manual start. Check the full code to match parts correctly.
Parsun 25HP 2‑Stroke models are usually carbureted twin‑cylinder engines. Look for a 2‑cylinder powerhead with a single carburetor and a manual or electric starter.
If your outboard has oil injection or requires premix, note that configuration on the tag or in the manual—some parts differ between premix and oil‑injected variants.

Engine Overview

Parsun 25HP 2‑Stroke Platform

Feature	Description
Configuration	Inline‑2, carbureted 2‑Stroke; manual or electric start; tiller or remote control options.
Common Models	General 25HP 2‑Stroke variants (short/long shaft, tiller/remote). Exact code and suffix determine specific fittings.
Advantages	Lightweight, simple carburetion, strong low‑to‑mid torque, straightforward DIY service.
Notes	Verify shaft length and control type before ordering. Some parts interchange by platform and year; always confirm via model/serial plate.

Routine Maintenance & Service Parts

Intervals below are general guidelines for typical recreational use. Always follow the service schedule and specifications in your official owner’s/service manual.

Item	Interval*	Remarks	Parts Link
Lower unit gear oil	Every 100 hours or annually	Inspect magnet and oil for metal; replace seals if water intrusion is found.	Lower Unit Seal Kits
Spark plugs	Inspect every 50 hours; replace 100 hours or as needed	Use correct heat range and gap; replace sooner if fouled or corroded.	Spark Plugs
Fuel filter / water‑separating filter	100 hours or annually; more often in harsh conditions	Replace clogged or water‑contaminated elements to protect carburetor.	Fuel Filters
Water pump impeller/kit	Every 2 seasons (12–24 months) or 200 hours	Replace impeller more frequently if operated in sandy/silty water or if tell‑tale is weak.	Water Pump Impeller Rebuild Kits
Anodes (sacrificial zinc/aluminum)	Inspect every 50 hours; replace when 50% consumed	Choose alloy for your water (salt, brackish, or fresh). Keep anodes clean and unpainted.	Anodes
2‑Stroke oil supply (premix or oil injection)	Check every outing	Verify correct premix ratio per manual or that the oil pump/lines are intact and bled of air.	Oil/Fuel Hoses
Propeller inspection	Every 50 hours or after impacts	Remove prop to check for fishing line at seals; inspect blades and hub for damage.	Propellers

*Intervals may vary by operating environment and duty cycle.

Frequently Used Parts Categories

Routine Service — Service & Maintenance Kits
Cooling System — Water Pump Impeller Rebuild Kits
Fuel System — Fuel Filters
Carburation — Carburetor
Ignition / Electrical — Electrical Items
Propulsion — Propellers
Corrosion Protection — Anodes

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 operation.	Water pump impeller/kit, intake screen, thermostat
Poor acceleration or power loss	Check fuel quality; replace fuel filter; inspect spark plugs; ensure carburetor is clean and correctly jetted.	Fuel filter, spark plugs, carburetor repair parts
Hard starting / rough idle	Verify choke/enrichment function; check for air leaks in fuel lines; confirm correct plug gap and fresh fuel.	Spark plugs, fuel hoses, carburetor components
Excessive smoke (2‑Stroke)	Confirm premix ratio or oil‑injection settings; check for stuck choke and flooded carburetor.	Fuel system parts, oil hoses, choke/enrichment components
Gearcase noise or metal in gear oil	Inspect prop hub and shear pin; check gear oil condition; pressure/vacuum test for seal leaks.	Lower unit seal kit, propeller/hardware, gear oil service items

FAQs

Are parts interchangeable between different years or platforms?

Some Parsun 25HP 2‑Stroke components carry across model years, but changes in shaft length, control type, and ignition/fuel configurations can affect fitment. Always confirm with your full model code and serial number before ordering.

When should I replace the water pump impeller?

For recreational use, replace the impeller every 2 seasons or about 200 hours—sooner if the tell‑tale weakens, you run in sandy/silty water, or the engine has overheated.

How often should I change the lower unit gear oil?

Change gear oil at least annually or every 100 hours. If the oil looks milky or contaminated, replace seals and retest to prevent gear damage.

What information do you need to confirm part compatibility?

Please provide the full model code, serial number, shaft length, control type (tiller or remote), and whether the engine is premix or oil‑injected. Photos of the nameplate and the part needing replacement are helpful.

Ready to find what you need? Browse our outboard parts by category and refine with Filter & Sort to match your 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.