Generic 135HP 2-Stroke Outboard Engine Parts

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This page is dedicated to Mercury 2‑Stroke 135HP outboard engines. It helps you quickly find compatible replacement parts and practical service information, including maintenance tips, common replacement categories, and troubleshooting guidance. You can also browse the main Mercury collection, and at the bottom of this page you can start browsing parts for this engine. 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 135HP Model

Locate the serial/model tag on the swivel bracket (port or starboard side). Some engines also include a plate above the steering tube with serial data.
Mercury 135HP 2‑Stroke model codes commonly begin with 1135…; suffixes indicate year, shaft length, and starting/controls. Record the full model and serial.
Distinguish platform type: earlier V6 carbureted/EFI vs. later V6 DFI (OptiMax‑class). Cooling, ignition, and fuel components differ between platforms.
Confirm gearcase type and shaft length; water pump kits, propellers, and seal kits can vary with lower‑unit style and model year.

Platform Overview

V6 2‑Stroke (Carbureted/EFI)

Feature	Description
Configuration	V6 2‑Stroke, typically carbureted (earlier) or EFI; compact gearcase options.
Common Models	Model codes starting 1135… from late 1980s through late 1990s.
Advantages	Strong mid‑range power and relatively light weight for a 135HP V6 class.
Notes	Ignition, fuel, and cooling parts vary by serial range and year; verify model/serial before ordering.

V6 2‑Stroke (DFI / OptiMax‑Class)

Feature	Description
Configuration	V6 2‑Stroke Direct Fuel Injection on later 135HP variants.
Common Models	Late 1990s–mid‑2000s; model codes also begin 1135… with platform/year suffixes.
Advantages	Improved fuel economy and emissions compared with carb/EFI models.
Notes	DFI‑specific air/fuel/sensor parts are not interchangeable with carb/EFI platforms; confirm platform before purchase.

Routine Maintenance & Service Parts

Intervals below are general guidelines for Mercury 2‑Stroke 135HP engines; always follow your official service manual and adjust for local conditions.

Item	Interval*	Remarks	Parts Link
Gear Oil (Lower Unit)	Every 100 hrs or annually	Inspect for metal or water intrusion; reseal if oil appears milky.	Mercury Outboard Parts
Spark Plugs	Inspect each season; replace ~100 hrs	Gap to spec; replace fouled or worn plugs to improve idle and acceleration.	Spark Plugs
Fuel Filter / Inline Filter	100 hrs or annually	Replace more often with ethanol fuel or storage; check for water/debris.	Fuel Filters
Water Pump Impeller / Kit	Every 2–3 seasons or ~100 hrs	Replace sooner if weak tell‑tale or overheat alarm occurs.	Mercury Water Pump Repair Kits
Anodes (Trim Tab/Block/External)	Inspect every 50 hrs; replace as needed	Use the correct alloy for fresh, brackish, or saltwater to prevent corrosion.	Anodes
Oil Injection System Check (2‑Stroke)	Seasonally	Verify pump operation, lines, and filters; premix only per manual if required.	Mercury Outboard Parts
Thermostats	Inspect annually; replace if sticking	Stuck‑open stats cause cold‑running; stuck‑closed can overheat.	Mercury Outboard Parts
Propeller & Hub	Inspect each trip; service seasonally	Check for dings and fishing line; verify hub integrity to prevent slip.	Propellers
Gearcase Seals (if water found)	As needed	If oil is milky, pressure/vacuum test and reseal the lower unit.	Mercury Lower Unit Seal Kits

*Intervals may vary with usage, environment, and specific model year/platform.

Frequently Used Parts Categories

Cooling System – Mercury Water Pump Repair Kits
Gearcase & Seals – Mercury Lower Unit Seal Kits
Fuel System – Fuel Filters
Ignition / Starting – Spark Plugs
Propulsion – Propellers
Corrosion Protection – Anodes
Safety – Propeller Guards

Common Symptoms & Quick Checks

Symptom	Check First	Related Parts
Weak tell‑tale or overheat alarm	Inspect intake screens, thermostat operation, and impeller condition.	Water pump kit, thermostat(s), intake screen
Poor acceleration or power loss	Check spark plug condition, fuel filters, and prop hub integrity.	Spark plugs, fuel filter, propeller/hub
Hard starting / rough idle	Verify fuel quality, primer bulb and lines for air leaks; inspect plugs and idle settings.	Spark plugs, fuel lines/hoses, inline filter
Excessive smoke (2‑Stroke)	Confirm correct oiling (injection or premix); check for cold‑running due to stuck thermostat.	Oil injection components, thermostat, spark plugs
Gearcase noise / metal in oil	Drain and inspect gear oil; pressure/vacuum test for seal leaks.	Gear oil, lower unit seal kit, bearings

FAQs

Are parts interchangeable between different years or platforms?

Not always. Carb/EFI and DFI (OptiMax‑class) platforms use different fuel, ignition, and sensor components. Verify model and serial numbers to ensure compatibility.

When should the impeller be replaced?

A good rule is every 2–3 seasons or about 100 hours. Replace sooner if the tell‑tale weakens, an overheat alarm occurs, or the impeller shows visible wear.

How often should lower‑unit gear oil be changed?

Inspect and replace every 100 hours or annually. If oil appears milky or metallic, pressure test the gearcase and reseal before further use.

What information helps confirm part compatibility?

Provide the engine’s full model and serial numbers, shaft length, controls (tiller/remote), and whether it is carb/EFI or DFI. Photos of the nameplate and the existing part are also helpful.

Ready to browse by horsepower, year, and model? Explore the main Mercury collection to narrow results for your 135HP 2‑Stroke.

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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.