Generic 2-Stroke 115HP Outboard Engine Parts

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Designed for Generic 2-Stroke 115HP outboard engines, this page helps you identify compatible parts and plan routine service. Below you’ll find maintenance tips, common replacement parts, and troubleshooting guidance. You can also browse the main Yamaha collection for a broad selection of components, and scroll to the bottom to start browsing parts for this engine. On the collection pages, use the Filter & Sort controls to narrow results by horsepower, year range, and part category/section.

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How to Identify Your 115HP Model

Locate the nameplate/serial plate on the transom bracket or engine clamp; it lists the model code, serial number, and often shaft length.
Decode the model suffix: letters typically indicate shaft length (S/L/X), starting/trim features (E/T), and year or market code. Example: Yamaha codes like 115TJRX indicate a 115HP two-stroke with specific trim/shaft features.
Confirm platform type: many 115HP 2‑strokes are V4 (e.g., some Yamaha and Johnson/Evinrude) while others are inline‑4 (e.g., some Mercury). Parts like gaskets, ignition, and lower unit components can differ by platform.
For oiling: determine if your engine is premix or oil‑injected. Fuel lines, oil pumps, and carb settings vary accordingly.

Platform Overview

V4 2‑Stroke (Carbureted, Oil‑Injected or Premix)

Feature	Description
Configuration	V4, carbureted two‑stroke; many models use oil injection with mechanical pump and remote oil tank.
Common Models	Popular among Yamaha 115/130 families (e.g., 1990s Yamaha 115 codes such as 115TJRX), and Johnson/Evinrude 115 V4 models.
Advantages	Strong mid‑range torque, robust gearcases shared across nearby HP ratings, wide parts availability.
Notes	Many cooling, ignition, and lower‑unit parts interchange within the family; confirm by model code and serial range.

Inline‑4 2‑Stroke (Carbureted)

Feature	Description
Configuration	Inline‑4, carbureted two‑stroke; typically premix or oil‑injected depending on year and brand.
Common Models	Seen on various Mercury/Mariner 115 two‑stroke platforms from similar eras.
Advantages	Lighter weight in some trims, straightforward carb service, widely available ignition parts.
Notes	Carb jetting, reeds, and gear ratios may differ; verify with the exact model and serial.

Routine Maintenance & Service Parts

Intervals below are general guidelines for two‑stroke outboards; always follow the official service manual for your exact model and operating conditions.

Item	Interval*	Remarks	Parts Link
Gear oil (lower unit)	Every 100 hours or annually	Inspect for water or metal. Replace seals if contamination is found.	Yamaha Lower Unit Seal Kits
Spark plugs	Every 100 hours or annually	Check heat range and gap; replace if fouled or eroded.	Spark Plugs
Fuel filter / water‑separating filter	Inspect every 50 hours; replace annually	Drain water bowl if equipped; replace element if debris or water is present.	Fuel Filters
Water pump impeller/kit	Every 2 seasons (or 200 hours)	Shorten interval for sandy/silty water or weak telltale.	Yamaha Water Pump Repair Kits
Anodes (internal/external)	Inspect every 50 hours; replace as needed	Use the correct material for your water (aluminum, zinc, or magnesium).	Yamaha Anodes
Oil injection system service (if equipped)	Annually	Inspect pump linkage, prime lines, and verify tank pickup/strainer condition.	Yamaha Service & Maintenance Kits

Common Symptoms & Quick Checks

Symptom	Check First	Related Parts
Weak telltale or overheat alarm	Inspect intake screens, telltale hose, and age of impeller; verify thermostat operation.	Water pump kit, intake screen, thermostat, telltale hose
Poor acceleration or power loss	Check prop hub for slippage, fuel quality, spark strength, and compression. Ensure carbs are clean/synchronized.	Spark plugs, fuel filter, carburetor kit, propeller
Hard starting or rough idle	Verify choke/enrichment, primer bulb condition, and look for air leaks in fuel lines. Inspect reeds if accessible.	Spark plugs, carburetor kit, fuel pump/lines, enrichment valve
Excessive smoke (2‑stroke)	Confirm correct premix ratio or oil‑pump setting; check float levels and needle/seat sealing.	Spark plugs, carb jets/needles, oil pump linkage/lines
Gearcase noise or metal in gear oil	Inspect drain/fill plug magnets and pressure test the gearcase; check prop shaft for fishing line.	Lower unit seal kit, bearings, prop shaft seals

FAQs

Are parts interchangeable between different years or platforms?

Some 115HP two‑stroke components interchange within the same family (e.g., V4 115/130 sharing gearcase or ignition parts). Always verify by model code and serial number before ordering.

When should the impeller be replaced?

Replace the impeller every two seasons (or about 200 hours), sooner if you notice a weak telltale, overheat alarms, or if the motor is used in sandy or silty water.

How often should lower unit gear oil be changed?

Change gear oil every 100 hours or annually. Inspect for water intrusion (milky oil) or metal on the drain plug magnet, and replace seals if needed.

What information do you need to confirm part compatibility?

Please provide the complete model code, serial number, shaft length, and whether the engine is premix or oil‑injected. Photos of the nameplate and the part to be replaced are also helpful.

Ready to find the right components? Browse the main Yamaha collection by horsepower, year, and model to zero in on compatible parts for your 115 two‑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.