BRP Johnson 50HP 2-Stroke Outboard Marine Engine Parts

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This page is for Johnson 50HP 2‑Stroke outboard engines. It helps you find compatible parts and key service information, including maintenance tips, common replacement parts, and troubleshooting guidance. You can also browse the main Johnson/Evinrude collection. Scroll to the bottom of the page to start browsing parts for this engine. 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 50HP Model

Nameplate location: Look on the transom/mounting bracket or swivel bracket for the identification plate with the model and serial number.
Reading model codes: Johnson model codes often include characters for start type and shaft length (e.g., E = electric start, R = rope start, L = long shaft). Year identifiers are included for many 1970s models.
2‑Stroke specifics: These engines are carbureted 2‑strokes. Confirm whether your engine uses manual choke or an electric primer, and note control type (tiller vs. remote) when selecting parts.
Match before ordering: Small differences by year, shaft length, and controls can change water pump and gearcase parts. Always match the exact model code from the nameplate.

Engine Overview

Johnson 50HP 2‑Stroke (1970s-era models)

Feature	Description
Configuration	Carbureted 2‑stroke outboard, available in rope or electric start and multiple shaft lengths.
Common Models	Examples seen in the early–late 1970s include codes such as 50ESL71, 50R73, and 50RL79 (verify your exact code on the nameplate).
Advantages	Simple design, good power-to-weight, widely supported with aftermarket service parts.
Notes	Impellers, gearcase seals, and control-related parts may vary by year and shaft length; always confirm parts against your full model code.

Routine Maintenance & Service Parts

Intervals below are general guidelines for typical recreational use. Always follow the official service manual for your exact model, environment, and duty cycle.

Item	Interval*	Remarks	Parts Link
Gear oil (lower unit)	Every 100 hours or annually	Check for water/metal; reseal if contamination is found.	Johnson/Evinrude/OMC Lower Unit Seal Kits
Spark plugs	Inspect every 50 hours; replace 100 hours or annually	Verify heat range and gap per manual; carry spares aboard.	Spark plug
Inline fuel filter	100 hours or annually; sooner if debris present	Replace if restricted or after contaminated-fuel events.	Fuel Filters
Water pump impeller / kit	Every 2–3 seasons or 200 hours	Replace sooner if weak tell‑tale, overheat alarm, or sandy use.	Johnson/Evinrude/OMC Water Pump Repair Kits
Anodes (zincs)	Inspect often; replace at ~50% loss	Use the correct alloy for your water (salt, brackish, fresh).	Johnson/Evinrude/OMC Anodes
2‑Stroke fuel/oil	Every fill‑up	Use the fuel‑oil ratio specified in your manual. If oil‑injected (where equipped), inspect hoses and prime system per procedure.	Johnson/Evinrude
Propeller inspection	Check each trip	Remove fishing line, inspect hub, and grease the spline during service.	Johnson/Evinrude/OMC Propellers

Frequently Used Parts Categories

Routine Service: Johnson/Evinrude/OMC Service & Maintenance Kits
Cooling System: Water Pump Repair Kits
Gearcase & Seals: Lower Unit Seal Kits
Propulsion: Johnson/Evinrude/OMC Propellers
Corrosion Protection: Johnson/Evinrude/OMC Anodes
Fuel System: Fuel Filters
Gaskets & Sealing: Johnson/Evinrude/OMC Gaskets

Common Symptoms & Quick Checks

Symptom	Check First	Related Parts
Weak tell‑tale or overheat alarm	Inspect intake screen for debris; verify impeller condition; confirm thermostat operation.	Water pump repair kit, intake screen, thermostat, gasket set.
Poor acceleration or power loss	Check for damaged prop, fouled plugs, stale fuel, or restricted fuel filter.	Propeller, spark plugs, inline fuel filter, carb gasket/cleaning supplies.
Hard starting or rough idle	Verify choke/primer function, plug condition and gap, and air leaks at fuel lines.	Spark plugs, fuel line/primer bulb, carburetor gasket set.
Excessive smoke (2‑Stroke)	Confirm correct fuel‑oil mix; ensure engine is fully warmed; check for flooding.	Spark plugs, fuel needle/seat, correct 2‑stroke oil ratio (per manual).
Gearcase noise or metal in oil	Confirm oil level/condition; inspect prop shaft for fishing line; pressure/vacuum test seals.	Lower unit seal kit, prop hardware/hub, bearings (as applicable).

FAQs

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

Many service items are shared across nearby years, but details like shaft length, start type, and gearcase options can change part fit. Always match parts to the full model code on your nameplate.

When should the impeller be replaced?

For typical recreational use, replace the impeller every 2–3 seasons or ~200 hours. Inspect sooner after sandy or silty operation, weak tell‑tale, or any overheat warning.

How often should I change the gear oil?

Change lower unit gear oil every 100 hours or annually, and any time it appears milky, burnt, or contaminated. If water or metal is present, pressure/vacuum test and reseal the gearcase.

What information do you need to confirm part compatibility?

Please provide the full model number, serial number, shaft length, start type (rope/electric), control type (tiller/remote), and any known year range. Photos of the nameplate help avoid mistakes.

Ready to find parts for your Johnson 50HP 2‑Stroke? Browse the main Johnson/Evinrude collection by horsepower, year, and model.

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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.