Mercury 2-Stroke 80HP Outboard Marine Parts
(67 products)
This page is dedicated to Mercury 2‑Stroke 80HP outboard engines. Use it to find compatible parts and service information, including maintenance tips, common replacement parts, and troubleshooting guidance. You can also browse the main Mercury collection, and at the bottom of this page you’ll find a quick route 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.
Browse All Mercury Parts
How to Identify Your 80HP Model
- Locate the serial/nameplate on the transom bracket or swivel bracket. Record the full serial number and any model code shown.
- Model suffixes identify shaft length, steering/control type, and market variations. These details help ensure seal kits, water pump kits, and ignition parts match your unit.
- For 2‑Stroke 80HP engines, Mercury produced both inline‑3 (newer) and older inline‑4 platforms. Jet‑drive variants also exist; jet pumps use different wear parts than propeller models.
- If your engine has an oil‑injection tank and lines, it is oil‑injected 2‑stroke; if not, it’s likely a premix model (follow the correct fuel/oil ratio in your manual).
Routine Maintenance & Service Parts
Intervals below are general guidelines for typical recreational use. Always follow the official Mercury service manual for your exact model and operating conditions.
| Item |
Interval* |
Remarks |
Parts Link |
| Gear oil (lower unit) |
Every 100 hrs or annually |
Inspect for water contamination (milky oil). Replace drain screw seals if needed. |
Mercury Collection |
| Spark plugs |
Every 100 hrs or annually |
Check gap and replace fouled plugs sooner (2‑stroke oils and short runs can foul). |
Spark Plugs |
| Fuel filter / in‑line filter |
Inspect every 50 hrs; replace 100 hrs |
Replace sooner if fuel is stale or contaminated; consider water‑separating filter. |
Fuel Filters |
| Water pump impeller / kit |
Every 2 seasons (or 200 hrs) |
In sandy/silty water, service annually. Weak tell‑tale or overheat alarm = service now. |
Mercury Water Pump Repair Kits |
| Anodes (sacrificial) |
Inspect 50 hrs; replace when 50% depleted |
Match alloy (salt, brackish, or fresh water). Keep clean and unpainted. |
Anodes |
| Thermostat |
Every 2 years |
Stuck thermostats affect warm‑up, smoke, and fuel economy. |
Mercury Collection |
| Carburetor cleaning / kit (carb models) |
As needed; typically every 2–3 seasons |
Stale fuel or storage can cause varnish. Balance/adjust carbs after service. |
Carburetor |
| Oil‑injection system check (if equipped) |
Every 100 hrs or annually |
Inspect tank strainer, lines, and pump operation; replace brittle hoses. |
Hoses |
| Lower unit seals (if leaking) |
As needed |
If gear oil is milky or water‑contaminated after service, reseal before further use. |
Mercury Lower Unit Seal Kits |
Frequently Used Parts Categories
Common Symptoms & Quick Checks
| Symptom |
Check First |
Related Parts |
| Weak tell‑tale stream or overheat alarm |
Inspect intake screens, flush passages; verify impeller condition and thermostat operation. |
Water pump kit, thermostat, anodes |
| Poor acceleration / power loss |
Check prop damage, fuel quality, fuel filter, and spark plugs; clean/adjust carbs if applicable. |
Fuel filter, spark plugs, carburetor kit, propeller |
| Hard starting / rough idle |
Verify choke/enrichment function, look for air leaks at fuel lines, confirm spark and compression. |
Spark plugs, fuel hoses, carburetor kit |
| Excessive smoke (2‑stroke) |
Confirm correct fuel/oil ratio or oil‑injection function; check stuck choke or cold‑running due to thermostat. |
Thermostat, spark plugs, fuel hoses |
| Gearcase noise / metal in gear oil |
Check oil level and condition; inspect prop shaft for fishing line; pressure‑test gearcase. |
Lower unit seal kit, gear lube drain plug seals, propeller hardware |
FAQs
Are parts interchangeable between different years or platforms?
Many service items carry across years, but Mercury produced both inline‑3 and earlier inline‑4 80HP platforms. Cooling, gasket, and gearcase parts can differ by serial range. Always confirm with your model/serial before ordering.
When should the impeller be replaced?
As a rule, replace every 2 seasons (or ~200 hours). In sandy or silty water, service annually. Any weak tell‑tale stream or overheat alarm means service immediately.
How often should I change lower‑unit gear oil?
Every 100 hours or once per season. Also change it after any impact or if you see water intrusion (milky oil). Replace the drain screw seals if they are damaged.
What information helps confirm part compatibility?
Provide the serial number, full model code, shaft length, control/steering type, and whether it’s a prop or jet variant. Photos of the nameplate and the part you’re replacing are very helpful.
Ready to find parts for your Mercury 2‑Stroke 80HP? Browse the main Mercury collection and filter by horsepower, year, and category for a fast match.
Shop Mercury Outboard Parts
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.
Regular price $65.00Unit price
Regular price $35.00Unit price
