OMC 55HP 2-Stroke Outboard Engine Parts

(2 products)

This page is for OMC 2‑Stroke 55 HP outboard engines. Use it to find compatible parts and service information, including maintenance tips, common replacement parts, and troubleshooting guidance. You can also browse the main Johnson/Evinrude/OMC 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 55HP Model

Nameplate location: Look for the model/serial plate on the transom bracket or starboard swivel bracket. A secondary decal may be inside the engine cover.
Reading the model code: OMC/Johnson/Evinrude codes typically include horsepower, start type (manual/electric), shaft length (S/L/XL), and control type (tiller/remote). A suffix or letter code often denotes the model year.
Platform cues: 2‑Stroke twin‑cylinder engines have two spark plugs and carbureted induction. Note whether your engine is premix or equipped with an oil‑injection (VRO) system.
Shaft length check: Measure from the transom mounting surface to the anti‑ventilation plate to confirm short (15 in), long (20 in), or extra‑long (25 in) shaft.

Platform Overview

Inline‑2 Carbureted 2‑Stroke (55 HP class)

Feature	Description
Configuration	Twin‑cylinder, carbureted 2‑Stroke outboard; CDI ignition; premix or oil‑injection depending on year/options.
Common Models	OMC/Johnson/Evinrude 55 HP 2‑cyl variants from roughly the 1970s–1990s in short/long shaft, tiller or remote configurations.
Advantages	Light weight, simple service, strong low‑to‑midrange torque for small runabouts and fishing boats.
Notes	Many routine service parts overlap with 40/45/48/50/55 HP 2‑cyl families of similar years. Verify by model code and gearcase style before ordering.

Routine Maintenance & Service Parts

Intervals below are general guidelines for typical recreational use. Always follow the procedures and schedules in your official service manual.

Item	Interval*	Remarks	Parts Link
Gear oil (lower unit)	100 hours or annually	Change more often if water intrusion or heavy use. Replace seals if oil looks milky.	Johnson/Evinrude/OMC Outboard Parts
Spark plugs	100 hours or annually	Inspect gap and color; replace if fouled or worn.	Spark Plugs
Fuel filter / inline filter	100 hours or annually	Replace and check for debris; inspect fuel lines for cracking.	Fuel Filters
Water pump impeller / kit	Every 100 hours or 2 seasons	Replace sooner if weak tell‑tale, overheat alarm, or sand/silt use.	Johnson/Evinrude/OMC Water Pump Repair Kits
Anodes (zincs)	Inspect every 50 hours; replace when 50% gone	Use the correct alloy for fresh, brackish, or salt water.	Johnson/Evinrude/OMC Anodes
Thermostat	Inspect every 2 years	Replace if stuck, corroded, or causing cold‑running or overheat issues.	Johnson/Evinrude/OMC Outboard Parts
Lower unit seal kit	As needed	Install when gear oil shows water (milky) or after prop‑shaft fishing line damage.	Johnson/Evinrude/OMC Lower Unit Seal Kits
Fuel/oil mix or oil‑injection service	Each use / annually	Use correct premix ratio (commonly 50:1) if not oil‑injected. If VRO/oil‑injection equipped, inspect hoses and reservoir filter annually.	Johnson/Evinrude/OMC Hoses

Frequently Used Parts Categories

Routine Service Kits — Johnson/Evinrude/OMC Service & Maintenance Kits
Cooling System — Water Pump Repair Kits
Lower Unit — Lower Unit Seal Kits
Impellers — Johnson/Evinrude/OMC Impellers
Propellers — Johnson/Evinrude/OMC Propellers
Corrosion Protection — Johnson/Evinrude/OMC Anodes
Fuel System — Fuel Filters

Common Symptoms & Quick Checks

Symptom	Check First	Related Parts
Weak tell‑tale or overheat alarm	Inspect water inlet screens for blockage; verify impeller condition; test thermostat for proper opening temperature.	Water pump kit, intake screen, thermostat
Poor acceleration or power loss	Check prop condition and pitch; replace fuel filter; inspect spark plugs; evaluate compression and carburetor cleanliness.	Propeller, fuel filter, spark plugs, carburetor repair kit
Hard starting or rough idle	Verify primer bulb and fuel quality; confirm choke/enrichment operation; set idle mixture and sync/linkage per manual.	Spark plugs, fuel filter, primer bulb, carburetor repair kit
Excessive smoke (2‑Stroke)	Confirm correct fuel/oil mix; check for stuck thermostat causing cold running; adjust idle mixture if overly rich.	Spark plugs, thermostat, carburetor adjustments
Gearcase noise or metal in oil	Drain gear oil to inspect for metal/water; check prop‑shaft for fishing line; pressure/vacuum test for seal leaks.	Gear oil, lower unit seal kit, bearings

FAQs

Are parts interchangeable between different years or platforms?

Many routine parts on the 2‑cyl 40–55 HP family interchange across years, but there are variations in gearcases, ignition, and fuel systems. Always confirm by model code, serial number, and component style before ordering.

When should I replace the impeller?

As a preventative measure, replace the impeller every 100 hours or every 2 seasons—sooner if the motor was run in sand, silt, or shows a weak tell‑tale stream or overheat warning.

How often should I change the gear oil?

Change lower unit gear oil every 100 hours or annually. Inspect for water (milky color) or metal debris; if present, address seal or gear issues before further operation.

What information do you need to confirm part compatibility?

Provide the full model code and serial number, shaft length, starting method (manual/electric), control type (tiller/remote), and whether the engine is premix or oil‑injected. Clear photos of the nameplate and the part area also help.

Ready to find parts by horsepower, year, and model? Browse the main Johnson/Evinrude/OMC collection for compatible components for your OMC 55 HP 2‑Stroke.

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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.