Welcome Aboard!

10% savings across all ranges sitewide for new customers · Terms apply

FLASHSALE26

OMC 4-Stroke 75-150HP Outboard Marine Engine Parts

(1 products)

Designed for OMC 4‑Stroke 75–150HP outboard engines, this page helps you quickly find compatible replacement parts and essential service information. Below you’ll find maintenance intervals, commonly replaced items, and troubleshooting tips specific to mid‑range four‑stroke outboards. You can also browse the main OMC/Johnson/Evinrude collection. Scroll to the bottom to start browsing parts for this engine, and remember you can use the “Filter & Sort” controls on the collection page to narrow results by horsepower, year range, and part category/section.

Browse All OMC/Johnson/Evinrude Parts

How to Identify Your 75–150HP Model

  • Find the nameplate/serial plate on the transom bracket or swivel bracket. It lists the model code, serial number, and horsepower.
  • Decode the model suffix: common markers include shaft length (S/L/XL), control type (tiller vs. remote), and revision/year code.
  • Confirm 4‑Stroke features: oil fill/cap and an engine oil filter on the powerhead; EFI components and high‑pressure fuel system are typical in this range.
  • Note cowl and block differences across 75–115 vs. 135–150 classes; some service parts (impeller kits, anodes) overlap, while filters and plug heat ranges may differ.

Engine Overview

75–115HP Inline‑4 EFI 4‑Stroke

Feature Description
Configuration Inline‑4, EFI 4‑stroke with DOHC valve train typical for this class; designed for efficient cruising and easy starts.
Common Models 75–115HP four‑stroke OMC/Johnson models (remote or tiller variants; multiple shaft lengths).
Advantages Good fuel economy, broad torque curve for mid‑range acceleration, relatively light weight for class.
Notes Impeller kits and anodes often cross‑fit within this HP band; verify filters, plug type, and prop hub with model/serial.

135–150HP Inline‑4 EFI 4‑Stroke

Feature Description
Configuration Inline‑4, larger‑displacement EFI 4‑stroke tuned for higher top‑end with strong mid‑range torque.
Common Models 135–150HP four‑stroke OMC/Johnson models in multiple shaft lengths and control configurations.
Advantages Confident hole‑shot on heavier hulls, steady charging output for electronics, refined idle quality.
Notes Propeller pitch selection is critical; service parts such as oil filters and plugs are model‑specific—match by model code.

Routine Maintenance & Service Parts

Intervals below are general guidelines for mid‑range four‑stroke outboards; always follow the official service manual for your exact model.

Item Interval* Remarks Parts Link
Engine oil + filter Every 100 hours or annually Use marine 4‑stroke oil (FC‑W) and correct filter; change sooner for heavy use. Oil Filters
Gear oil (lower unit) Every 100 hours or annually Inspect for water or metal; replace sealing washers. Pressure/vac test after reseal. Johnson/Evinrude/OMC Outboard Parts
Spark plugs Inspect 100 hours; replace 200 hours or as needed Verify correct heat range and gap for your model. Spark Plugs
Fuel filter / water separator Every 100 hours or annually Replace more frequently with ethanol fuel or contamination. Fuel Filters
Water pump impeller / kit Every 2–3 seasons (or 200–300 hours) Replace sooner if weak telltale, overheat alarm, or sandy/silty use. Johnson/Evinrude/OMC Water Pump Repair Kits
Anodes (zincs) Inspect every 3 months; replace at ~50% loss Match alloy to water type (salt, brackish, fresh). Johnson/Evinrude/OMC Anodes
Gearcase seal kit (as needed) When water intrusion is detected Perform full reseal if milky oil is found; inspect shafts and bearings. Johnson/Evinrude/OMC Lower Unit Seal Kits
Complete service kit Each annual service Convenient bundle of common maintenance parts for select models. Johnson/Evinrude/OMC Service & Maintenance Kits

Frequently Used Parts Categories

Common Symptoms & Quick Checks

Symptom Check First Related Parts
Weak telltale or overheat alarm Inspect intake screens, thermostat, and impeller condition; check for kinked hoses. Water pump repair kit, thermostat, intake screen, gaskets
Poor acceleration or power loss Verify prop condition/pitch, fuel quality, and clogged filters; inspect plugs. Propeller, fuel filter, spark plugs
Hard starting or rough idle Check battery health, spark plug gap, stale fuel; confirm no air leaks in fuel line. Spark plugs, fuel filter, primer bulb/lines, starter
Gearcase noise or metal in gear oil Drain and inspect gear oil; check for water intrusion; verify shift linkage adjustment. Lower unit seal kit, bearings, shims, prop shaft components
Charging issues (low or overcharging) Test battery and connections; verify regulator/rectifier output per manual. Regulator/rectifier, battery cables, fuses

FAQs

Are parts interchangeable across different years or platforms?

Some maintenance items (impellers, anodes, certain seals) may span multiple years within the 75–150HP four‑stroke range, but filters, plugs, and many hardware pieces are model‑specific. Always verify by full model code and serial before ordering.

When should I replace the impeller?

As a preventive measure every 2–3 seasons (or 200–300 hours), and immediately if you notice weak telltale flow, overheating, or sand/silt ingestion.

How often should I change lower unit gear oil?

Every 100 hours or annually. Inspect for water (milky oil) or metal. If contamination is present, perform a reseal and retest.

What information helps confirm part compatibility?

Provide the exact model number, serial number, horsepower, shaft length, and control type. Photos of the nameplate and the part needing replacement are also helpful.

Ready to find parts by horsepower, year, and model? Browse our main OMC/Johnson/Evinrude collection to dial in the exact components for your 4‑stroke 75–150HP outboard.

Shop OMC/Johnson/Evinrude Parts

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.
View as
Back to top

Compare /5