Yamaha 2-Stroke 45HP Outboard Marine Engine Parts

(6 products)

This page focuses on Yamaha 2-Stroke 45HP outboard engines and helps you find compatible parts and service information. Below you’ll find maintenance tips, common replacement parts, and troubleshooting guidance. You can also browse the main Yamaha collection for a wider range of components. Scroll to the bottom of this page to start 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 45HP Model

Nameplate/serial label location: typically on the transom clamp bracket (port side) or on the swivel bracket. Match the model code and serial when ordering parts.
Reading the model code: codes generally include horsepower plus suffixes for start type (manual/electric), shaft length (S=15 in, L=20 in), and control type (tiller/remote). The final letter/digit often indicates a year or revision.
2-stroke specifics: identify whether your engine is premix or oil-injection (autolube). Look for an oil tank line entering the engine if oil-injected.
Platform cues: cylinder count can vary by market/year. Count spark plug leads (two vs. three) and note carburetor configuration to confirm parts compatibility.

Engine Overview

Yamaha 45HP 2‑Stroke (General Overview)

Feature	Description
Configuration	Carbureted 2-stroke inline platform; cylinder count may vary by year/market (twin or triple). Lightweight with simple ignition and cooling systems.
Common Models	45HP 2-stroke outboard variations; confirm with the exact model code and shaft length suffix when selecting parts.
Advantages	Low weight, strong holeshot, straightforward routine service, and good parts availability.
Notes	Cooling, ignition, and fuel components can differ by serial range and cylinder count—verify your nameplate details before ordering.

Routine Maintenance & Service Parts

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

Item	Interval*	Remarks	Parts Link
Gear oil (lower unit)	Every 100 hours or annually	Inspect magnet/plug for metal; milky oil indicates water intrusion—pressure test and reseal.	Shop Yamaha
Spark plugs	Inspect every 50 hours; replace ~100 hours/season	Check gap, look for fouling or glazing; replace as a set.	Spark Plugs
Fuel filter / inline filter	Every 100 hours or annually	Replace more often with ethanol-blended fuel; watch for debris and restriction.	Fuel Filters
Water pump impeller/kit	Every 2 seasons or 200 hours (inspect annually)	Replace sooner if weak tell‑tale stream or overheat alarm; include key, cup, wear plate, and gaskets as needed.	Yamaha Water Pump Kits
Anodes (external & internal)	Inspect every 50 hours; replace when ~50% consumed	Match anode material to water type (zinc/aluminum/magnesium); ensure clean metal-to-metal contact.	Yamaha Anodes
2‑Stroke oiling (premix or oil injection)	Check each service interval	Premix: confirm correct ratio per manual. Oil injection: inspect tank filter, lines, and pump adjustment; bleed system after service.	Shop Yamaha
Lower unit seals (if water found in oil)	As needed after pressure/vacuum test	Replace prop shaft, drive shaft, and shift shaft seals; inspect bearings and shims.	Yamaha Lower Unit Seal Kits

Frequently Used Parts Categories

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

Common Symptoms & Quick Checks

Symptom	Check First	Related Parts
Weak tell‑tale stream / overheat alarm	Inspect intake screens for debris; verify impeller condition; confirm thermostat operation and clear tell‑tale hose.	Water pump kit, thermostat, intake screen, gaskets
Poor acceleration / power loss	Check prop damage/cavitation; inspect plugs; replace fuel filter; verify carburetor cleanliness and timing.	Propeller, spark plugs, fuel filter, carburetor rebuild components
Hard starting / rough idle	Prime the bulb; check for air leaks at connectors/hoses; verify choke/enrichment function and idle mixture.	Fuel connectors, fuel hoses, spark plugs, carburetor parts, gaskets
Excessive smoke (2‑stroke)	Confirm correct premix ratio or oil pump setting; check float levels and needle/seat sealing; replace stale fuel.	Oil pump components, carb jets/needles, spark plugs, fuel filter
Gearcase noise / metal in oil	Drain and inspect oil; check for fishing line on prop shaft; perform pressure/vacuum test before teardown.	Lower unit seal kit, bearings, shims, prop shaft hardware

FAQs

Are parts interchangeable between different years or platforms?

Not always. Cooling, ignition, and fuel components can change across year ranges and between twin vs. triple‑cylinder variants. Use the exact model code and serial to confirm compatibility before ordering.

When should the impeller be replaced?

As a rule of thumb, inspect annually and replace about every 2 seasons or 200 hours. Replace sooner if the tell‑tale stream weakens, you overheat, or the engine ingested sand/silt.

How often should the gear oil be changed?

Change the lower unit gear oil every 100 hours or annually. If the oil looks milky or contaminated, pressure test the gearcase and service the seals before returning to use.

What information do you need to confirm part compatibility?

Provide the model code, serial number, shaft length (S/L/XL), start type (manual/electric), and whether the engine is premix or oil‑injected. Photos of the nameplate and the existing part can also help.

Ready to find parts? Browse the main Yamaha collection and use Filter & Sort to narrow by horsepower, year, and model.

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If you’re unsure about your model, send us a clear photo of the nameplate and the part you need—we’ll help verify compatibility.