Mercury 35HP 2-Stroke Outboard Motor Parts

(45 products)

Parts and service guidance for Mercury 2-Stroke 35HP outboard engines. Use this page to find compatible replacement parts, maintenance tips, and troubleshooting steps. You can also browse the main Mercury collection. Scroll to the bottom to start browsing parts for this engine, and remember you can use the Filter & Sort controls on the collection page to narrow by horsepower, year range, and part category.

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How to Identify Your 35HP Model

Find the serial/nameplate on the swivel bracket (port or starboard). Some models also have an instruction/ID plate between the thumb screws near the steering tube.
Model suffixes typically indicate shaft length (short 15 / long 20), tiller vs. remote control, and electric vs. manual start. Use the serial range to match parts precisely.
This page covers 2-stroke 35 HP engines. Many are carbureted inline‑2 designs. If your cowl indicates 4-stroke, use the 4-stroke categories instead.
Mid‑1980s through 1989 models are common in this class; confirm year/serial before ordering to avoid platform differences.

Platform Overview

Mercury 35HP 2-Stroke Platform

Feature	Description
Configuration	Inline‑2, carbureted 2‑stroke with CDI ignition; short or long shaft; tiller or remote variants.
Common Models	35HP 2‑Stroke models from the mid‑1980s to 1989, offered in manual/electric start and various shaft lengths.
Advantages	Light weight, simple maintenance, strong low‑to‑midrange torque for small boats.
Notes	Some components may overlap with similar‑era 30–40HP models; always confirm by serial to ensure correct parts.

Routine Maintenance & Service Parts

Intervals below are general guidelines for typical recreational use. Always follow your specific service manual for procedures and timing.

Item	Interval*	Remarks	Parts Link
Gear oil (lower unit)	Every 100 hrs or annually	Change sooner if water intrusion or metal on magnet is found.	Mercury Lower Unit Seal Kits
Spark plugs	Inspect 50 hrs; replace 100 hrs/season	Use correct heat range and gap for your serial range.	Spark Plug
Fuel filter (inline)	100 hrs or annually	Replace more often with ethanol fuel or contaminated tanks.	Fuel Filters
Water pump impeller/kit	2–3 seasons or 200 hrs	Replace sooner if weak telltale, overheat alarm, or sandy/silty use.	Mercury Water Pump Repair Kits
Anodes (zincs)	Inspect every 50 hrs; replace when 50% depleted	Choose alloy for your water (zinc, aluminum, or magnesium).	Anodes
2‑Stroke oil / fuel mix or oil injection service	Every fill (premix) or per manual (oil injection)	Most premix models use 50:1 (confirm). If oil‑injected, inspect pump, lines, and filter per service manual.	Mercury Outboard Parts

Frequently Used Parts Categories

Routine Service d Service & Maintenance Kits
Cooling System d Mercury Water Pump Repair Kits
Lower Unit & Seals d Mercury Lower Unit Seal Kits
Propellers d Propellers
Fuel System d Fuel Filters
Ignition / Electrical d Electrical Items
Corrosion Protection d Anodes

Common Symptoms & Quick Checks

Symptom	Check First	Related Parts
Weak telltale or overheat alarm	Inspect intake screens, telltale hose, and impeller condition; confirm thermostat operation.	Water pump repair kit, impeller, thermostat, intake screen
Poor acceleration or power loss	Check prop hub for slipping, fuel quality, fuel filter, and spark plug condition/gap.	Propeller, fuel filter, spark plugs, carburetor rebuild kit
Hard starting or rough idle	Verify choke/enrichment function, primer bulb, idle mixture, and compression.	Spark plugs, carburetor kit, fuel lines/hoses
Excessive smoke (2‑stroke)	Confirm oil ratio (premix), ensure choke is opening, and check idle mixture.	Spark plugs, carburetor needle/float, thermostat
Gearcase noise or metal in gear oil	Check for water intrusion, seal damage, and bearing wear; pressure/vacuum test if needed.	Lower unit seal kit, bearings, gear lube

FAQs

Are parts interchangeable across different years or platforms?

Not always. Mercury revised ignition, gearcases, and brackets over time. Match parts by serial number and configuration (shaft length, start type, tiller/remote) to ensure proper fit.

When should the water pump impeller be replaced?

As a rule of thumb, replace every 23 seasons or about 200 hours. In sandy or silty water, inspect and replace more frequently to protect the powerhead.

How often should I change the lower unit gear oil?

Change at least every 100 hours or annually, and immediately after any ground strike or evidence of water intrusion (milky oil).

What information helps confirm part compatibility?

Engine serial number, approximate year, shaft length (15/20), tiller vs. remote control, and starting method (manual/electric). Photos of the nameplate and the part needing replacement are also helpful.

Ready to find the right fit? Browse the main Mercury collection by horsepower, year, and model.

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If you 26#39;re unsure about your model, send us a photo of the nameplate and the part you need and we 26#39;ll help verify compatibility.