Johnson 2-Stroke 145HP Outboard Marine Engine Parts

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This page is for Johnson 2-Stroke 145HP outboard engines. Use it to quickly find compatible parts, routine service guidance, and troubleshooting tips. You can also browse the main Johnson/Evinrude/OMC collection for a wider selection. Scroll to the bottom of this 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 145HP Model

Locate the nameplate/serial tag on the transom bracket or swivel bracket. It lists the model code, serial number, and often shaft length (L/XL).
Decode model suffixes: common letters indicate shaft length (L=20 in, XL=25 in), starting/controls, and model year. The 2‑stroke label will be on the cowling or in the manual.
Identify platform: V4 engines have four spark plugs/coils and four exhaust ports; V6 engines have six. Mid‑range 140–150 class Johnsons were built in both V4 loop‑charged and V6 variants depending on year/market.
Check carburetor count and gearcase: many 2‑strokes in this class use multiple carbs and standard (RH) gearcases; commercial variants may differ.

Platform Overview

V4 2‑Stroke (140–150 class, loop‑charged in many years)

Feature	Description
Configuration	V4, carbureted 2‑Stroke, loop‑charged cooling/scavenging, mechanical fuel system
Common Models	Examples include 140–150 HP V4 2‑Stroke series; model codes vary by shaft length (L/XL) and controls
Advantages	Lighter weight vs V6, strong mid‑range torque, straightforward serviceability
Notes	Water pump and gearcase hardware share families with other Johnson/Evinrude V4 units; verify by model code and gearcase style

V6 2‑Stroke (150 class, some markets detuned)

Feature	Description
Configuration	V6, carbureted 2‑Stroke, cross‑flow or loop‑charged depending on year; standard rotation gearcase typical
Common Models	Examples include 150 HP V6 families; confirm propshaft diameter and bearing carrier style before ordering parts
Advantages	Higher top‑end potential, robust gearcase options, wide parts availability
Notes	Prop hardware, gear sets, and seal kits differ vs V4; verify model year and shaft length (L/XL)

Routine Maintenance & Service Parts

Intervals below are general guidelines for 2‑stroke outboards in this horsepower class. Always follow the official service manual for your exact model and operating conditions.

Item	Interval*	Remarks	Parts Link
Lower unit gear oil	Every 100 hrs or annually	Change more often if water intrusion or metal fines are found	Johnson/Evinrude/OMC Service & Maintenance Kits
Lower unit seal kit (if needed)	Inspect during gear oil service	Replace when water contamination is detected or seals are damaged	Johnson/Evinrude/OMC Lower Unit Seal Kits
Spark plugs	Every 100 hrs or annually	Indexing may improve combustion; replace sooner if fouling occurs	Spark Plugs
Fuel filter / water-separating filter	Every 100 hrs or annually	Critical for carbureted 2‑strokes to prevent lean conditions	Fuel Filters
Water pump impeller / kit	Every 2–3 seasons (or sooner in sandy/silty use)	Weak tell‑tale or overheat alarms warrant immediate service	Johnson/Evinrude/OMC Water Pump Repair Kits
Anodes (zincs)	Inspect every 50 hrs; replace when 50% consumed	Use the correct alloy for fresh, brackish, or salt water	Johnson/Evinrude/OMC Anodes
2‑Stroke oil supply (premix or oil injection)	Every use; inspect injection lines annually	Use TC‑W3 marine oil; 50:1 premix unless your model uses oil injection	Johnson/Evinrude/OMC Outboard Parts

*Intervals are typical guidelines; consult your service manual for model-specific procedures.

Frequently Used Parts Categories

Cooling System — Water Pump Repair Kits
Lower Unit Service — Lower Unit Seal Kits
Propulsion — Johnson/Evinrude/OMC Propellers and Propeller Guards
Ignition / Electrical — Electrical Items and Starters
Fuel System — Fuel Filters and Fuel Pumps
Corrosion Protection — Anodes
Gaskets & Bearings — Gaskets and Bearings

Common Symptoms & Quick Checks

Symptom	Check First	Related Parts
Weak tell‑tale or overheat alarm	Inspect water pump impeller, intake screens, and thermostat operation	Water pump kit, thermostat, intake screen grommets
Poor acceleration / power loss	Fuel quality, clogged filters, carb sync/cleanliness, prop pitch/condition	Fuel filters, carb kits, spark plugs, prop & hub hardware
Hard starting / rough idle	Spark condition, choke/enricher function, air leaks on fuel lines	Spark plugs, ignition leads, fuel line/hose, carb gaskets
Excessive smoke	Verify correct oil ratio; ensure thermostats close properly; check for stuck choke	Thermostats, choke/enricher components, fuel/oil system service
Gearcase noise or metal in gear oil	Oil level/condition, propshaft seal leakage, bearing play	Lower unit seal kit, carrier bearings, thrust washers

FAQs

Are parts interchangeable between different years or between V4 and V6 models?

Some service parts cross between years within the same platform, but many items (gearcase hardware, bearings, prop hardware, ignition modules) differ between V4 and V6 or across year changes. Always confirm by model code, serial, and shaft length.

When should I replace the water pump impeller?

As preventive maintenance, every 2–3 seasons, or immediately if the tell‑tale is weak, the engine overheats, or you operate in sandy/silty water. Consider a full pump kit if the wear plate or housing shows grooves.

How often should I change the gear oil?

Typically every 100 hours or annually. If the oil looks milky or contains metal fines, service seals and inspect bearings and gears before returning to service.

What information helps confirm compatibility?

Provide the full model code, serial number, shaft length (L/XL), number of cylinders (V4 vs V6), and clear photos of the gearcase and nameplate. This ensures we match the correct kits and hardware.

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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.