Sea Sierra 2-Stroke 115HP Outboard Engine Parts

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This page is for Sea Sierra 2-Stroke 115HP outboard engines. Use it to find compatible parts, routine service guidance, and troubleshooting tips. You can also browse the main collection to locate brand-specific components. Scroll to the bottom of this page to begin 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 115HP Model

Locate the identification/nameplate on the transom clamp bracket or swivel bracket. Record the model, serial, and any suffix letters.
Decode the model string: the base “115” indicates horsepower; suffixes typically denote shaft length (S/L/XL), control type (tiller/remote), and production year or revision.
Confirm 2‑stroke configuration: look for carburetors and an oil-injection tank (if equipped). Some 2‑strokes are pre‑mix, others use oil injection.
Note platform cues: many 115HP 2‑strokes are inline‑4; some legacy models are V4. Gearcase and mounting hardware can differ by platform and year.

Engine Overview

Inline‑4 Carbureted 2‑Stroke (115HP class)

Feature	Description
Configuration	Inline‑4, carbureted 2‑stroke; pre‑mix or oil‑injected depending on model family.
Common Models	115HP 2‑stroke inline‑4 models across major manufacturers and year ranges.
Advantages	Light weight, strong mid‑range punch, simple maintenance.
Notes	Jetting, reed style, and ignition components vary by year. Gearcase and impeller kits must be matched by model/serial.

V4 2‑Stroke (115HP class)

Feature	Description
Configuration	V4 2‑stroke (crossflow or loop‑charged), typically carbureted; some models feature oil injection.
Common Models	Legacy 90–115–140HP V4 families from multiple brands; verify by model/serial.
Advantages	Robust gearcase, strong low‑to‑mid‑range torque, widely supported service parts.
Notes	Lower‑unit ratios and prop hubs differ by family. Anodes, mounts, and thermostat styles may be platform‑specific.

Routine Maintenance & Service Parts

Intervals below are general guidelines; always follow your official service manual for exact procedures and specifications.

Item	Interval*	Remarks	Parts Link
Gear oil (lower unit)	Every 100 hrs or annually	Use marine gear lube; inspect for metal and water intrusion. Replace seals if milky.	Service & Maintenance Kits
Spark plugs	Every 100 hrs or annually	Replace or clean/gap to spec; indexing may improve idle quality.	Spark Plugs
Fuel filter / water separator	Inspect each 50 hrs; replace annually	Protects carbs/injectors from debris and water; carry a spare on board.	Fuel Filters
Water pump impeller / kit	200 hrs or 2–3 seasons	Replace sooner if weak tell‑tale, sandy/silty use, or overheat alarm.	Water Pump Impeller Rebuild Kits
Anodes (sacrificial)	Inspect every 50 hrs; replace <50% remaining	Match alloy (zinc/aluminum/magnesium) to water type (salt/brackish/fresh).	Anodes
Oil‑injection system check (if equipped)	Every season	Inspect lines, clamps, and tank; prime and verify pump output. Pre‑mix engines: maintain correct fuel/oil ratio.	Hoses
Thermostat(s)	Inspect annually; replace as needed	Stuck stats cause cold running or overheat; replace with correct temp rating.	Service & Maintenance Kits
Lower unit seal kit (if leak found)	As needed	Water in gear lube or oil weep at seals calls for a reseal and pressure test.	Lower Unit Seal Kits

Frequently Used Parts Categories

Routine Service: Service & Maintenance Kits
Cooling System: Water Pump Impeller Rebuild Kits
Fuel System: Fuel Filters | Fuel Pumps
Ignition / Electrical: Electrical Items
Propulsion & Performance: Propellers | Outboard Hydrofoil Stabilizers
Corrosion Protection: Anodes
Gearcase Service: Lower Unit Seal Kits

Common Symptoms & Quick Checks

Symptom	Check First	Related Parts
Weak tell‑tale stream or overheat alarm	Inspect intake screens for debris, verify thermostat operation, and assess impeller age.	Water pump impeller kit, thermostat, intake screen/cover
Poor acceleration or power loss	Replace fuel filter, verify primer bulb and fuel lines, check plug condition and prop pitch.	Fuel filter, hoses/primer bulb, spark plugs, propeller
Hard starting / rough idle	Confirm fresh fuel, correct oil ratio or functioning oil injection, and proper plug gap.	Spark plugs, fuel filter, hoses, ignition components
Excessive smoke (2‑stroke)	Verify fuel/oil mix; check for leaking oil lines or stuck choke/enrichment.	Hoses, choke/enrichment parts, spark plugs
Gearcase noise or metal in gear oil	Drain and inspect lube; pressure/vacuum test; check prop shaft for fishing line.	Lower unit seal kit, anodes (for corrosion), propeller hardware

FAQs

Are parts interchangeable between different years or platforms?

Some routine items (plugs, anodes, filters) may interchange within the same model family, but gearcase, ignition, mounts, and cooling components can differ across years or between inline‑4 and V4 platforms. Verify by model and serial before ordering.

When should the impeller be replaced?

As a preventive measure every 2–3 seasons or ~200 hours, and sooner if you see a weak tell‑tale, run in sandy/silty water, or trigger an overheat alarm.

How often should gear oil be changed?

Change every 100 hours or annually, and any time water intrusion is suspected or after an impact/submersion. Inspect the drained oil for metal or milkiness.

What information helps confirm part compatibility?

Provide model and serial numbers, approximate year, shaft length, control type (tiller/remote), and whether the engine is pre‑mix or oil‑injected. Photos of the nameplate and the part area are very helpful.

Ready to find parts by horsepower, year, and model? Browse our main collection and filter to your exact 115HP 2‑stroke configuration.

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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.