Johnson 2-Stroke 1.5HP Outboard Engine Parts

(3 products)

This page is for Johnson 2-Stroke 1.5HP outboard engines. It helps you find compatible parts and service information, including maintenance tips, common replacement parts, and troubleshooting guidance. You can also browse the main Johnson collection. Scroll to the bottom of the 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 1.5HP Model

Model/serial plate location: typically on the top outside edge of the clamp bracket or on the swivel bracket. On many small Johnsons it’s visible with the engine tilted.
Reading the model code: letters often indicate shaft length (S = short 15", L = long 20") and other features. The final characters can denote production year or revision.
2‑Stroke identifier: small portable Johnsons in this class are carbureted 2‑strokes with manual (rope) start and tiller steering.
Match year range: many Johnson 1.5 HP models were produced in the late 1960s; verify the exact year on your plate for best parts compatibility.

Engine Overview

Johnson 1.5HP Portable 2‑Stroke

Feature	Description
Configuration	Single‑cylinder, carbureted 2‑stroke; manual rope start; tiller control.
Common Models	Late‑1960s 1.5 HP Johnson 2‑Stroke portable models (verify your exact model/year from the nameplate).
Advantages	Ultra‑lightweight, simple to service, ideal for dinghies and small tenders.
Notes	Use marine TC‑W3 2‑stroke oil at the ratio specified on your cowling/manual (many use 50:1). Keep the cooling system maintained due to small passages.

Routine Maintenance & Service Parts

Intervals below are general guidelines for small 2‑stroke portables; always follow your engine’s official service manual.

Item	Interval*	Remarks	Parts Link
Gear oil (lower unit)	Every 100 hours or annually	Look for water (milky oil) or metal on the drain plug magnet.	Johnson/Evinrude
Spark plug(s)	Inspect every 50 hours; replace annually	Check heat range and gap spec for your exact model/year.	Johnson/Evinrude
Fuel filter / inline screen	Every 100 hours or annually	Replace if contaminated; keep fuel fresh and stabilized.	Fuel Filters
Water pump impeller / kit	Every 2–3 seasons or 200 hours	Critical for cooling on small 2‑strokes; replace sooner if weak tell‑tale.	Johnson/Evinrude/OMC Water Pump Repair Kits
Anodes (zincs)	Inspect every 50 hours; replace when 50% worn	Choose correct alloy for fresh, brackish, or salt water.	Johnson/Evinrude/OMC Anodes
2‑Stroke oil & fuel mix	Every fill‑up	Use marine TC‑W3 oil; follow the ratio on your engine’s decal/manual.	Johnson/Evinrude
Lower unit seal kit (as needed)	If water intrusion is detected	Replace seals if gear oil turns milky or leaks are present.	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 and Impellers
Fuel System: Fuel Filters
Ignition / Electrical: Electrical Items
Gearcase Sealing: Lower Unit Seal Kits
Corrosion Protection: Anodes
Propellers & Hardware: Johnson/Evinrude/OMC Propellers

Common Symptoms & Quick Checks

Symptom	Check First	Related Parts
Weak tell‑tale or overheat alarm	Inspect intake screen, water pump impeller, and thermostat (if equipped)	Water pump kit, intake screen, grommets, thermostat
Poor acceleration / power loss	Check fuel freshness, filter, carburetor cleanliness, and prop condition	Fuel filter, carb gasket set, spark plug, propeller
Hard starting / rough idle	Verify choke operation, plug gap/condition, and idle mixture settings	Spark plug, carb kit, fuel line, primer bulb
Excessive smoke (2‑stroke)	Confirm correct oil ratio and quality; avoid stale or over‑oiled fuel mix	Plugs, fuel/oil mix, carb adjustments
Gearcase noise or metal in oil	Inspect gear oil, prop shaft for fishing line, and seals	Lower unit seal kit, gear oil, prop shaft seal

FAQs

Are parts interchangeable between different years of 1.5 HP Johnsons?

Some service parts interchange across multiple years, but many items (cooling, ignition, gearcase seals) are year‑specific. Always verify by model and serial number to ensure a correct fit.

When should I replace the impeller?

On small 2‑strokes, replace the impeller every 2–3 seasons or sooner if the tell‑tale weakens, you ran through sand, or the engine overheated.

How often should I change the gear oil?

Change gear oil at least annually or every 100 hours. If you see milky oil or metal particles, service the seals and inspect components before further use.

What information do you need to confirm part compatibility?

Provide the full model number, serial number, and shaft length if known. Photos of the nameplate and the part needing replacement also help confirm fitment.

Ready to find parts? Browse the main Johnson collection and filter by horsepower, year, and model to locate compatible components.

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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.