OMC 2-Stroke 8HP Outboard Motor Parts

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This page is built for OMC 2‑Stroke 8HP outboard engines. Use it to find compatible parts and service information, including maintenance tips, common replacement items, and troubleshooting guidance. You can also browse the main OMC collection. Scroll to the bottom of this page to 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/section.

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How to Identify Your 8HP Model

Nameplate location: Look on the transom clamp bracket or swivel bracket for the metal tag or sticker. Record the model number and serial number.
Reading the model code: OMC/Johnson/Evinrude codes typically indicate horsepower (8), shaft length (S=15", L=20"), starting/controls (e.g., E for electric), and a year identifier. Check your service manual or model chart to confirm.
2‑Stroke traits: No crankcase oil fill like a 4‑stroke; the engine is premix or oil‑injected depending on year. Most 8HP units are twin‑cylinder, carbureted, and often rope‑start.
Similar platforms: Many 8HP 2‑stroke models share gearcase and water‑pump components with 9.9/15HP engines of similar eras. Always match by model/serial and shaft length.

Engine Overview

Small‑Twin 2‑Stroke Platform

Feature	Description
Configuration	Inline 2‑cylinder, carbureted 2‑stroke with conventional gearcase and water‑pump impeller cooling
Common Models	OMC/Johnson/Evinrude 8HP 2‑Stroke models (many share pump/gearcase parts with 9.9/15HP from mid‑1970s onward; verify by model/serial)
Advantages	Lightweight, simple maintenance, good trolling manners, easy rope‑start
Notes	Cooling‑system service is critical. Many water‑pump kits fit multiple HP ratings/years; always confirm against your model and shaft length. Maintain the proper fuel/oil premix ratio per the official manual (commonly 50:1 unless specified otherwise).

Routine Maintenance & Service Parts

Intervals below are general guidelines for typical recreational use. Always follow the official service manual for your exact model, usage, and environment.

Item	Interval*	Remarks	Parts Link
Gear oil (lower unit)	Every 100 hrs or annually	Inspect for water intrusion (milky oil) and metal shavings; reseal if contamination found	Lower Unit Seal Kits
Spark plugs	Inspect 50 hrs; replace annually	Gap per manual; replace if fouled or eroded	Spark Plugs
Fuel filter (inline)	Inspect 50 hrs; replace as needed	Replace if debris is visible or flow is restricted; keep fresh, ethanol‑safe hose	Fuel Filters
Water pump impeller / kit	Inspect annually; replace 2–3 seasons (sooner in sand/silt)	Weak tell‑tale or overheat alarm often points to a worn impeller or restricted intake	Water Pump Repair Kits
Anodes (zincs)	Inspect each trip/season; replace at ~50% loss	Use alloy matched to water type (salt/brackish/fresh)	Anodes
Thermostat	Test annually; replace 2–3 seasons	Stuck‑open stats cause cold running and excess smoke; stuck‑closed causes overheat	Johnson/Evinrude/OMC Parts
2‑Stroke fuel/oil mix	Every refuel	Mix per manual (often 50:1). Use fresh fuel and marine‑grade hose/primer bulb	Fuel Hoses
Propeller & hub	Inspect each season	Remove prop to check for fishing line; grease splines; replace damaged blades or spun hubs	Propellers

Frequently Used Parts Categories

Routine Service — Johnson/Evinrude/OMC Parts
Cooling System — Water Pump Repair Kits
Gearcase & Seals — Lower Unit Seal Kits
Ignition / Electrical — Electrical Items
Fuel System — Fuel Filters & Fuel Hoses
Propulsion — Propellers
Corrosion Protection — Anodes

Common Symptoms & Quick Checks

Symptom	Check First	Related Parts
Weak tell‑tale or overheat alarm	Inspect tell‑tale outlet for blockage, intake screens for debris, and impeller wear; verify thermostat operation	Water pump kit, thermostat, intake screen
Poor acceleration / power loss	Check prop for damage, plugs for fouling, fuel for staleness, and inline filter for restriction	Propeller, spark plugs, fuel filter, carb gaskets
Hard starting / rough idle	Confirm choke/enrichment function, use fresh premix, clean/adjust carburetor, verify compression	Spark plugs, fuel filter, carb gasket/kit
Excessive smoke (2‑stroke)	Confirm correct oil ratio, stuck choke, cold‑running due to thermostat stuck open	Spark plugs, thermostat
Gearcase noise / metal in gear oil	Check oil level/condition, look for fishing line in prop‑shaft seal, pressure/vacuum test for leaks	Lower unit seal kit, propeller hub, service gear oil

FAQs

Are parts interchangeable between 8HP and 9.9/15HP OMC engines?

Many cooling and gearcase components (such as water‑pump kits) are shared among 8/9.9/15HP 2‑stroke engines in certain year ranges. However, ignition, carburetor, and some hardware can differ. Confirm using your exact model and serial, plus shaft length.

When should I replace the impeller?

Inspect annually and replace every 2–3 seasons for typical recreational use. Replace sooner if run in sand/silt, after any overheat, or if the tell‑tale is weak despite a clear outlet.

How often should I change gear oil?

At least once per season or every 100 hours. Also change it immediately if you notice milky oil, water contamination, or after an impact or fishing‑line incident at the prop shaft.

What information do you need to confirm part compatibility?

Please provide the model number, serial number, shaft length (S/L), starting/control type (tiller vs. remote; manual vs. electric), and your approximate year range. Photos of the nameplate and the parts you’re replacing are very helpful.

Ready to find parts for your OMC 2‑Stroke 8HP? Browse the main Johnson/Evinrude/OMC collection by 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.