Johnson 50HP 2-Stroke Outboard Engine Parts

(51 products)

This page is dedicated to Johnson 2‑Stroke 50 HP outboard engines. Use it to quickly find compatible parts and key service information. Below you’ll find maintenance tips, commonly replaced components, and troubleshooting guidance. You can also browse our main Johnson/Evinrude/OMC collection. Scroll to the bottom of this page to start browsing parts for this engine, and remember that on the collection page you can use the Filter & Sort controls to narrow results by horsepower, year range, and part category/section.

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How to Identify Your 50 HP Model

Nameplate/serial plate location: commonly on the top outside edge of the clamp bracket or on the top of the swivel bracket (port or starboard).
Model code and suffix: letters/numbers typically denote year, shaft length, starting method, and control type. Match the full code and serial to confirm parts.
Platform notes: 2‑Stroke models in this class were produced across multiple years; verify if your engine is tiller or remote, manual or electric start, and the shaft length (S/L/XL).
Before ordering: photograph the nameplate and note any carburetor/ignition tag information to help verify compatibility.

Engine Overview

Johnson 50 HP 2‑Stroke (General Characteristics)

Feature	Description
Configuration	Carbureted 2‑stroke outboard in the mid‑range class; configurations vary by year (tiller/remote, manual/electric start).
Common Models	Johnson 50 HP 2‑Stroke models from approximately the 1970s through early 1990s (various shaft lengths and control options).
Advantages	Proven, simple design; good power‑to‑weight; straightforward service procedures.
Notes	Some components overlap with adjacent OMC families in the 40–60 HP range; always verify by full model and serial before ordering.

Routine Maintenance & Service Parts

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

Item	Interval*	Remarks	Parts Link
Gear oil (lower unit)	Every 100 hours or annually	Inspect for water intrusion (milky oil) and metal shavings.	Johnson/Evinrude/OMC Outboard Parts
Spark plugs	Inspect every 50 hours; replace ~100 hours or as needed	Check gap and look for fouling; replace sooner if misfire or hard starting.	Spark plug
Fuel filter / inline filter	Inspect each trip; replace every season or if restricted	Use fresh, ethanol‑treated fuel; drain water separators regularly.	Fuel Filters
Water pump impeller/kit	Every 1–2 seasons (more often in sandy/silty water)	Replace at first sign of weak tell‑tale, overheat alarm, or dry start incident.	Johnson/Evinrude/OMC Water Pump Repair Kits
Anodes (sacrificial)	Inspect monthly; replace when 50% consumed	Use the correct alloy (fresh, brackish, or salt water) and keep electrical bonding intact.	Johnson/Evinrude/OMC Anodes
2‑Stroke lubrication (premix or oil injection check)	Each trip; follow manual	Confirm correct fuel/oil ratio or oil‑injection operation; commonly 50:1 premix unless otherwise specified.	Johnson/Evinrude/OMC Outboard Parts
Lower unit seal kit (if leak found)	As needed after failed pressure/vac test or milky oil	Reseal to correct water intrusion or oil leaks; replace worn prop shaft seals.	Johnson/Evinrude/OMC Lower Unit Seal Kits

Frequently Used Parts Categories

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

Common Symptoms & Quick Checks

Symptom	Check First	Related Parts
Weak tell‑tale or overheat alarm	Inspect intake screens for debris, verify thermostat operation, and assess impeller condition.	Water pump kit, thermostat, gaskets, intake screen
Poor acceleration or power loss	Check fuel quality, replace/inspect fuel filter, verify spark plugs and ignition leads; confirm prop size/condition.	Fuel filter, spark plugs, carburetor kit, propeller
Hard starting or rough idle	Prime the fuel system, verify choke/enrichment function, check for vacuum leaks and correct plug gap.	Spark plugs, fuel pump, fuel lines, carburetor kit
Excessive smoke (2‑Stroke)	Confirm fuel/oil ratio; check for stuck choke or flooding; ensure correct idle mixture.	Spark plugs, fuel needle/seat, fuel hose, oil injection components (if equipped)
Gearcase noise or metal in oil	Drain oil to inspect; perform pressure/vac test; examine prop shaft for fishing line cutting the seals.	Lower unit seal kit, bearings, shims, fresh gear oil

FAQs

Are parts interchangeable across different years of Johnson 50 HP 2‑Stroke models?

Some components interchange within related OMC families, but many items (ignition, carburetion, gearcase) are year‑ and model‑specific. Always confirm with your full model code and serial number.

When should I replace the impeller?

As a preventative measure, replace the impeller every 1–2 seasons, or immediately if you notice a weak tell‑tale, overheating, or any dry‑run event. Sandy or silty water warrants more frequent service.

How often should I change lower unit gear oil?

Change gear oil at least once per season or every 100 hours. Inspect for water contamination (milky appearance) or metal debris; investigate and reseal if present.

What information do you need to confirm part compatibility?

Provide the complete model code and serial number from the nameplate (usually on the clamp or swivel bracket), plus details like shaft length, control type, and starting method. Photos of the nameplate and the part needing replacement help ensure an accurate match.

Ready to find parts by horsepower, year, and model? Browse the main Johnson/Evinrude/OMC collection to locate components that fit your specific 50 HP 2‑Stroke outboard.

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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.