Mercury 2-Stroke 260HP Outboard Marine Engine Parts

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This page supports Mercury 2-Stroke 260 HP outboard engines. Use it to find compatible parts and practical service information, including maintenance intervals, commonly replaced items, and troubleshooting guidance. You can also browse the main Mercury collection. Scroll to the bottom of this page to start browsing parts for this engine, and on the collection page use the Filter & Sort controls to narrow results by horsepower, year range, and part category.

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How to Identify Your 260 HP Model

Locate the serial number/nameplate on the transom bracket or swivel bracket; a duplicate label may be on the powerhead. Record the complete serial sequence.
Model codes and suffixes can indicate shaft length, control type, and intended use (offshore/competition). Note any decals such as “EFI” or “Racing.”
Most 260 HP variants are high-performance 2.5 L V6 EFI (“horn”-style intake). This differs from carbureted 2.5 L models (e.g., 245 HP) and later 280 HP EFI engines, which may not share all parts.
For exact parts matching, verify gearcase type and electronics configuration, then cross-check against the official service literature.

Engine Overview

Mercury Racing 2.5 L V6 EFI (Typical 260 HP)

Feature	Description
Configuration	2.5 L V6, 2-stroke, EFI with high-flow “horn” intake; performance-oriented ignition and cooling
Common Models	260 EFI Offshore/Competition variants; related but different: 245 Carb and 280 EFI versions
Advantages	Light weight, strong top-end power, proven racing heritage
Notes	Some components interchange with other 2.5 L V6 models, but verify by serial, EFI vs. carb, and gearcase style before ordering. Follow Mercury Racing service procedures for setup and maintenance.

Routine Maintenance & Service Parts

Intervals below are general guidelines for typical recreational use; high-performance or racing use may require shorter intervals. Always follow the official Mercury service manual for your exact engine.

Item	Interval*	Remarks	Parts Link
Gear oil (lower unit)	Every 100 hours or annually	Inspect for water or metal; reseal gearcase if contamination is found	Mercury Lower Unit Seal Kits
Spark plugs	Inspect 50 hours; replace 100 hours or as needed	Use correct heat range; read plugs for mixture and detonation clues	Spark Plugs
Fuel filter / water separator	Every 100 hours or annually	Replace more frequently if using ethanol-blended fuel or in harsh conditions	Fuel Filters
Water pump impeller/kit	Annually or 100 hours (shorter for performance use)	Critical for cooling at high RPM; replace housing if scored	Mercury Water Pump Repair Kits
Anodes (zinc/aluminum/magnesium)	Inspect often; replace when 50% worn	Choose alloy for your water (salt, brackish, or fresh)	Anodes
Thermostats	Every 2 years or if overheat/idle issues occur	Verify correct opening temp; replace gaskets and seals	Mercury Outboard Parts
2‑Stroke oil supply	Every use; inspect each service	Premix per manual (many performance setups use premix) or service the oil-injection system if equipped (lines, filters, pump)	Mercury Outboard Parts

Frequently Used Parts Categories

General Mercury Outboard Parts – Browse Collection
Cooling System (Impellers & Kits) – Mercury Water Pump Repair Kits
Lower Unit & Seals – Mercury Lower Unit Seal Kits
Fuel System Filtration – Fuel Filters
Ignition / Electrical – Electrical Items
Propellers – Propellers
Corrosion Protection – Anodes

Common Symptoms & Quick Checks

Symptom	Check First	Related Parts
Weak telltale or overheat alarm	Inspect intake screens, thermostat function, and impeller condition; look for kinked hoses	Water pump kit, thermostat, intake screen grommets, hoses
Poor acceleration or power loss	Verify fuel quality, replace fuel filter, check spark plugs and compression; confirm throttle and timing setup	Fuel filter, spark plugs, fuel lines/primer bulb, ignition components
Hard starting or rough idle	Confirm strong battery/grounds, prime system, check for air leaks; inspect idle timing and sensor connections	Spark plugs, fuel hoses, electrical connectors, filters
Excessive smoke (2‑stroke)	Verify correct premix ratio or oil-injection setup; confirm engine reaches operating temperature	Spark plugs, 2‑stroke oil supply components, thermostats
Gearcase noise or metal in gear oil	Check oil level/condition, inspect for water intrusion; evaluate prop shaft seals and bearing play	Lower unit seal kit, gear oil, prop shaft seals, thrust hardware

FAQs

Are parts interchangeable between different years or platforms?

Many components are shared across Mercury 2.5 L V6 engines, but EFI vs. carbureted systems, ignition modules, and gearcases can differ. Always confirm with your serial number and configuration before ordering.

When should the water pump impeller be replaced?

For performance use, replace annually or every 100 hours, whichever comes first. In sandy or silty water, inspect more often and replace sooner if wear is evident.

How often should I change lower unit gear oil?

Every 100 hours or annually. Change immediately if you see milky oil (water intrusion) or after any propeller impact or submersion event.

What information helps confirm part compatibility?

Provide the full serial number, model description, shaft length, gearcase type, and whether your engine is EFI or carbureted. Clear photos of the nameplate and the part area are also helpful.

Ready to find parts for your Mercury 2-Stroke 260 HP? Browse the main Mercury collection and use Filter & Sort to narrow by horsepower, year, and category.

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If you’re unsure about your model, send us a clear photo of the nameplate and the part you need and we’ll help verify compatibility.