Evinrude 43HP 2-Stroke Marine Engine Parts

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This page focuses on Evinrude 43HP 2‑Stroke outboard engines. Use it to find compatible parts, service intervals, and troubleshooting guidance. You’ll also find maintenance tips and links to common replacement items. Prefer to browse broadly? You can view the main Johnson/Evinrude outboard collection as well. Scroll to the bottom to jump into parts for this engine, and remember you can use the “Filter & Sort” controls on the collection page to narrow by horsepower, year range, and part category.

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How to Identify Your 43HP Model

Locate the model/serial plate on the transom bracket (often starboard side) or the swivel bracket. The plate or sticker lists the model code and serial number.
Model codes include suffix letters for features such as shaft length, starting method, and control type. The final characters often indicate the model year or year code—use the service manual or dealer charts to decode.
For this horsepower class, most units are inline‑2, carbureted 2‑stroke engines. Earlier and later versions may use different gearcase and water pump components, so confirm the model code before ordering.
If the tag is missing, look for a casting plug or freeze plug on the powerhead with a stamped number, and match visual features (gearcase size, cowling, ignition layout) to the correct parts.

Platform Overview

Early family (approx. 1971–1988, 35–60 HP group)

Feature	Description
Configuration	Inline‑2, carbureted 2‑stroke with conventional ignition and earlier gearcase architecture.
Common Models	35–60 HP 2‑stroke variants from the era; many parts cross over within the family.
Advantages	Simple, serviceable design; widely available wear components (impellers, seals, plugs).
Notes	Water pump and gearcase parts often differ from later 40–50 HP units; verify model code before ordering.

Later family (approx. 1989–1998, 40–50 HP group)

Feature	Description
Configuration	Inline‑2, carbureted 2‑stroke with updated small‑gearcase design used on 40/48/50 HP models.
Common Models	40/48/50 HP 2‑stroke variants from the 1989–1990s period; many share impellers, seals, and prop hardware.
Advantages	Light weight, easy maintenance, and broad aftermarket support.
Notes	Impeller, anodes, and gearcase seals are routine wear items. Some models use different prop hub styles—confirm prop hardware set.

Routine Maintenance & Service Parts

Intervals below are general guidelines for mid‑size Evinrude 2‑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 hrs or annually	Inspect for water intrusion and metal debris; replace drain plug gaskets when servicing.	Lower Unit Seal Kits
Spark plugs	Inspect every 50 hrs; replace 100 hrs or annually	Check heat range and gap per manual; replace if fouled or worn.	Spark Plugs
Fuel filter (inline or under‑cowl)	Every 100 hrs or annually	Replace more often with stale or contaminated fuel; verify primer bulb and hoses.	Fuel Filters
Water pump impeller / kit	Every 2–3 seasons (or sooner in sandy/silty water)	Weak tell‑tale stream or overheat alarms suggest a worn impeller or blocked passages.	Water Pump Repair Kits
Anodes (zincs)	Inspect every 50 hrs; replace at ~50% depletion	Protects against galvanic corrosion; match material to water type (salt/brackish/fresh).	Johnson/Evinrude Anodes
2‑Stroke oiling (premix or oil injection)	Every trip (visual check)	Verify correct fuel/oil mix per manual for premix models, or maintain oil tank, lines, and filters on injected models.	Hoses & Lines
Thermostat inspection	Every 2 years	Stuck thermostats can cause cold‑running or overheating; inspect and replace if corroded.	Johnson/Evinrude Parts

*Intervals are typical for recreational use. Reduce intervals for heavy commercial duty or harsh environments.

Frequently Used Parts Categories

Routine Service: Johnson/Evinrude Service & Maintenance Kits
Cooling System: Water Pump Repair Kits
Gearcase & Seals: Lower Unit Seal Kits
Propellers & Hardware: Johnson/Evinrude Propellers
Ignition / Electrical: Electrical Items and Spark Plugs
Fuel System: Fuel Filters
Corrosion Protection: Johnson/Evinrude Anodes

Accessories: Propeller Guards, Hydrofoil Stabilizers, Boat Accessories

Common Symptoms & Quick Checks

Symptom	Check First	Related Parts
Weak tell‑tale stream or overheat alarm	Inspect intake screens for debris; verify impeller condition; test thermostat operation.	Water pump kit, thermostat, gaskets, anodes (if overheating from corrosion).
Poor acceleration / power loss	Check fuel quality and filter, spark plug condition, and propeller damage or fouling.	Fuel filter, spark plugs, propeller/hub hardware.
Hard starting / rough idle	Primer bulb and hoses for air leaks, choke/primer function, plug gap and fouling.	Fuel hoses and clamps, spark plugs, electrical tune‑up components.
Excessive smoke (2‑stroke)	Confirm correct oil mix (premix) or oil injection operation; look for fouled plugs.	Spark plugs, hoses/lines, maintenance kit items.
Gearcase noise or metal in gear oil	Drain and inspect gear lube; check for water intrusion; verify prop shaft seal area for fishing line.	Lower unit seal kit, prop hardware, gearcase service components.

FAQs

Are parts interchangeable between different years or platforms?

Many items (plugs, anodes, common gaskets) interchange across the 40–50 HP family, but gearcase, water pump, and prop hardware can change by year and sub‑model. Always verify the model code and serial before ordering.

When should I replace the impeller?

For recreational use, replace the impeller every 2–3 seasons, or sooner if the tell‑tale is weak, the engine overheats, or you operate in sandy/silty water.

How often should I change lower unit gear oil?

At least annually or every 100 hours. If the oil looks milky (water contamination) or contains metal debris, service immediately and inspect seals.

What information helps confirm part compatibility?

Provide the full model code, serial number, and a clear photo of the nameplate. Photos of the gearcase, prop hub, and the existing part also help ensure a correct match.

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Not sure about your exact model? Send us a photo of the nameplate and the part you need and we’ll help verify compatibility.