Johnson 2-Stroke 28-75HP Outboard Marine Engine Parts

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This page is for Johnson 2-Stroke 28–75HP outboard engines. Use it to find compatible parts and practical service information. Below you’ll find maintenance tips, common replacement parts, and troubleshooting guidance. You can also browse the main Johnson/Evinrude collection. Scroll to the bottom to start browsing parts for this engine, and remember you can use the collection page’s “Filter & Sort” controls to narrow results by horsepower, year range, and part category.

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How to Identify Your 28–75HP Model

Find the model/serial plate on the transom bracket or swivel bracket. It includes the model code, serial number, and often the production year.
Decode the model suffix: letters typically indicate shaft length (e.g., short/long/extra‑long), starting/controls (manual vs. electric, tiller vs. remote), and other options.
Confirm stroke type and configuration: these are 2‑Stroke engines. Within 28–75HP you’ll commonly see small twins (28–35HP), larger twins (40–50HP), and 3‑cylinder platforms (50–75HP).
When ordering parts, note the full model code and serial number to avoid variances across years/platforms.

Platform Overview

28–35HP Small Twin (2‑Stroke)

Feature	Description
Configuration	Inline‑2, carbureted 2‑Stroke
Common Models	28–35HP 2‑Stroke models (typical late 1970s–1990s variants)
Advantages	Simple, light, easy to service; good parts availability
Notes	Verify water pump/gearcase style when selecting seal kits and impellers

40–50HP Twin (2‑Stroke)

Feature	Description
Configuration	Inline‑2, carbureted 2‑Stroke
Common Models	40–50HP 2‑Stroke models (many late‑1980s through 1990s)
Advantages	Strong mid‑range; straightforward service procedures
Notes	Lower unit components and seal kits may differ by year—match by model code

50–75HP Triple (3‑Cylinder 2‑Stroke)

Feature	Description
Configuration	Inline‑3, carbureted 2‑Stroke
Common Models	50–75HP 3‑cyl 2‑Stroke (frequently 1979 and newer)
Advantages	Smoother operation than twins; good power‑to‑weight ratio
Notes	Use model/serial to confirm gear ratio, gearcase size, and water pump kit style

Routine Maintenance & Service Parts

Intervals below are general guidelines for 2‑Stroke Johnson models. Always follow your specific service manual for procedures and torque specs.

Item	Interval*	Remarks	Parts Link
Gear oil (lower unit)	Every 100 hours or annually	Inspect for water/milkiness; replace drain plug seals	Johnson/Evinrude Service & Maintenance Kits
Spark plugs	Inspect every 50 hours; replace ~100 hours	Check heat range and gap for your exact model	Spark Plugs
Fuel filter / water-separating filter	Inspect every 50 hours; replace ~100 hours	Replace sooner for contaminated fuel or storage use	Fuel Filters
Water pump impeller / kit	Every 2 seasons (annually in sandy/silty waters)	Weak telltale or overheat alarm calls for immediate service	Johnson/Evinrude Water Pump Repair Kits
Anodes	Inspect every 50 hours; replace when 50% wasted	Use correct alloy for fresh vs. salt water	Johnson/Evinrude Anodes
Lower unit seals (inspection)	Check at each gear oil change	Water intrusion suggests seal replacement and pressure/vac test	Johnson/Evinrude Lower Unit Seal Kits
2‑Stroke oil system	Every season	Premix ratio or oil‑injection checks; inspect oil lines and primer bulb	Johnson/Evinrude Hoses

*Adjust intervals for heavy use, high idle time, or harsh environments.

Frequently Used Parts Categories

Cooling System & Impellers: Johnson/Evinrude Water Pump Repair Kits
Gearcase Sealing: Johnson/Evinrude Lower Unit Seal Kits
Propellers & Hardware: Johnson/Evinrude Propellers
Ignition / Electrical: Electrical Items | Starters
Fuel System: Fuel Filters | Fuel Pumps
Corrosion Protection: Johnson/Evinrude Anodes
General Service: Johnson/Evinrude Service & Maintenance Kits

Common Symptoms & Quick Checks

Symptom	Check First	Related Parts
Weak telltale stream or overheat alarm	Clogged intake screen, brittle hoses, worn impeller, thermostat	Water pump kit, thermostat, intake screen, hoses
Poor acceleration / power loss	Old fuel, restricted fuel filter, fouled plugs, damaged prop	Fuel filter, spark plugs, propeller, fuel pump/lines
Hard starting / rough idle	Primer bulb, choke/primer system, plug gap, air leaks	Spark plugs, fuel filter, fuel pump diaphragm/primer parts
Excessive smoke (2‑Stroke)	Rich oil mix, stuck thermostat (cold running), carb settings	Spark plugs, carb service kit, thermostat
Gearcase noise or metal in gear oil	Low/contaminated gear oil, fishing‑line on prop shaft, leaking seals	Lower unit seal kit, bearings, thrust washers, gear oil & seals

FAQs

Are parts interchangeable between different years or platforms?

Some parts interchange, but many do not—especially across twin vs. 3‑cylinder platforms and different gearcases. Always match by full model code and serial number.

When should I replace the impeller?

As a preventive measure every two seasons, or annually in sandy/silty water. Replace immediately if the telltale is weak or an overheat alarm occurs.

How often should I change gear oil?

At least once per year or every 100 hours, whichever comes first. Inspect for water (milky color) or metal particles and address seal or gear issues promptly.

What information helps confirm part compatibility?

Provide the engine’s model code, serial number, horsepower, approximate year, and any notes on shaft length or control type. Photos of the nameplate and the existing part are very helpful.

Ready to shop? Browse the Johnson/Evinrude collection and use the filters to narrow by horsepower, year, and part type.

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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.