Johnson 2-Stroke 45HP Outboard Engine Parts

(24 products)

This page focuses on Johnson 2-Stroke 45HP outboard engines and helps you find compatible parts and service information. Below you’ll find maintenance tips, common replacement parts, and troubleshooting guidance. You can also browse our main Johnson/Evinrude collection. Scroll to the bottom of this page to start browsing parts for this engine, and remember you can use the “Filter & Sort” controls on the collection to narrow results by horsepower, year range, and part category.

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How to Identify Your 45HP Model

Find the model/serial tag on the clamp bracket’s top outer edge or on the swivel bracket (port or starboard).
Model codes typically include letters for features such as shaft length (S/L/XL) and starting/controls. The suffix can indicate year or revision—use the full code to confirm parts.
These 2‑stroke 45HP engines were produced primarily from the mid‑1980s through the late‑1990s; some share components with nearby 40/48/50HP families—verify by model number.
If unsure, photograph the nameplate and key components (gearcase, fuel system, ignition) to help match correct parts.

Engine Overview

Johnson 45HP 2‑Stroke (mid‑1980s to late‑1990s)

Feature	Description
Configuration	Carbureted 2‑stroke outboard, typically lightweight with simple ignition. Depending on year, units may be premix or use an oil‑injection system.
Common Models	45HP 2‑stroke models produced roughly 1986–1997; often related to the 40/48/50HP OMC family. Use full model code to confirm fitment.
Advantages	Low weight, straightforward maintenance, responsive mid‑range power.
Notes	Many wear items align with adjacent HP ranges. Always reference the model/serial tag before ordering to avoid mismatches.

Routine Maintenance & Service Parts

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

Item	Interval*	Remarks	Parts Link
Gear oil (lower unit)	Every season or 100 hours	Inspect for metal or water intrusion; replace seals if contamination is found.	Johnson/Evinrude/OMC Outboard Parts
Spark plugs	Inspect every 50 hours; replace as needed	Check gap and heat range per manual; replace fouled or worn plugs.	Spark Plugs
Fuel filter / water‑separating filter	Every season or 100 hours	Replace more often with ethanol fuel or if contamination is present.	Fuel Filters
Water pump impeller / kit	Annually or 100 hours	Replace sooner if weak tell‑tale, overheating, or sand/silt use.	Johnson/Evinrude/OMC Water Pump Repair Kits
Anodes (zincs)	Inspect every 50 hours; replace when 50% depleted	Match alloy to water type (salt/brackish/fresh) and ensure good bonding.	Johnson/Evinrude/OMC Anodes
2‑Stroke oiling (premix or oil‑injection)	Check each fill‑up / seasonal inspection	Verify correct premix ratio per manual, or inspect VRO/oil lines, clamps, and filters for leaks/air.	Johnson/Evinrude/OMC Hoses

Frequently Used Parts Categories

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

Common Symptoms & Quick Checks

Symptom	Check First	Related Parts
Weak tell‑tale or overheat alarm	Inspect intake screens for blockage; verify impeller condition; check thermostat operation.	Water pump kit, impeller, thermostat, gaskets, intake screen
Poor acceleration or power loss	Confirm fresh fuel and clean filters; check spark plug condition; verify prop pitch/damage.	Fuel filter, spark plugs, carburetor kit, propeller
Hard starting / rough idle	Prime the fuel system; inspect for air leaks in fuel lines; verify choke/enrichment function; check compression if persistent.	Fuel hoses, primer bulb, choke/enricher components, spark plugs
Excessive smoke (2‑stroke)	Verify correct oil ratio; ensure choke isn’t stuck on; check thermostat (cold running can increase smoke).	Spark plugs, oil lines, fuel/oil hoses, thermostat
Gearcase noise or metallic debris in oil	Drain gear oil and inspect; pressure/vacuum test gearcase; check prop shaft for fishing line cutting seals.	Lower unit seal kit, bearings, propeller, gear oil

FAQs

Are 45HP parts interchangeable with 40/48/50HP Johnson/Evinrude models?

Some components are shared across the OMC 40–50HP family, but not all years and variants match. Use the full model code and serial to verify compatibility before ordering.

How often should I replace the water pump impeller?

As a preventive measure, replace the impeller annually or every 100 hours. Replace sooner if the tell‑tale is weak, the engine overheats, or you operate in sandy/silty water.

When should gear oil be changed?

Change lower unit gear oil every season or 100 hours. Inspect for water (milky oil) or metal. If contamination is present, service the seals before returning to use.

What information do you need to confirm part fitment?

The model number (including suffix), serial number, shaft length, and a brief description or photo of the part needed. Photos of the nameplate and the area being serviced help prevent mistakes.

Ready to find parts by horsepower, year, and model? Browse our main Johnson/Evinrude collection to refine with Filter & Sort controls.

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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.