Johnson 35-300HP 2-Stroke Outboard Marine Engine

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This page is for Johnson 2‑Stroke 35–300HP 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/Evinrude collection. Scroll to the bottom of this page to start browsing parts for this engine, and remember that on the collection page you can use the Filter & Sort controls to narrow results by horsepower, year range, and part category.

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How to Identify Your 35–300HP Model

Nameplate location: Look on the transom bracket or swivel bracket for the model and serial plate.
Reading the code: Johnson model codes use letters and numbers to indicate features such as electric start (E), remote control (R), shaft length (L/XL), and a code for the model year.
Platform clues:
- 35–40HP: typically 2‑cylinder carbureted twins.
- 60–75HP: commonly inline‑3 two‑strokes.
- 85–140HP: V4 two‑strokes.
- 150–300HP: V6 two‑strokes (some later models use direct injection).
Oil system: Many 2‑strokes are premix; others use an oil injection (VRO) system—verify whether your engine requires premix or has an oil reservoir and pump.

Platform Overview

Inline‑2 (35–40HP)

Feature	Description
Configuration	2‑cylinder carbureted 2‑stroke, lightweight and simple to service.
Common Models	Examples from late 1970s: 35E/35R series, 40E/40R series (various shaft and control options).
Advantages	Low weight, easy starting, straightforward maintenance.
Notes	Cooling and ignition tune‑ups (impeller, plugs) restore most performance issues.

Inline‑3 (60–75HP)

Feature	Description
Configuration	3‑cylinder carbureted 2‑stroke with strong mid‑range torque.
Common Models	Examples include 65ES/65EL and 70EL series (vary by year and shaft length).
Advantages	Good balance of power and weight; popular for fishing and light runabouts.
Notes	Keep fuel system clean (filters and carb service) to prevent lean surging.

V4 (85–140HP)

Feature	Description
Configuration	V4 carbureted 2‑stroke; broad parts support and strong aftermarket.
Common Models	Examples: 85ETL, 115ETL, 140TL variants (model codes vary by start/control/shaft).
Advantages	Excellent hole‑shot, durable gearcases, wide propeller options.
Notes	Verify gear ratio and prop hub style when selecting propellers and hardware.

V6 (150–300HP)

Feature	Description
Configuration	V6 2‑stroke; earlier carbureted units and later direct‑injected variants.
Common Models	Examples: 150TL, 175TL, 200TL, 235TL series; later 300HP DI models in select years.
Advantages	High output for heavy hulls, robust charging systems, broad rigging support.
Notes	Use correct thermostats and poppet valves; ensure cooling flow is within spec before high‑load operation.

Routine Maintenance & Service Parts

Intervals below are general guidelines for Johnson 2‑stroke outboards. Always follow the procedures and schedules in your official service manual.

Item	Interval*	Remarks	Parts Link
Gear oil (lower unit)	Every 100 hrs or annually	Inspect for water intrusion (milky oil) and metal debris.	Johnson/Evinrude/OMC Service & Maintenance Kits
Spark plugs	Every 100 hrs or annually	Use correct heat range and gap; replace fouled plugs.	Spark Plug
Fuel filter / water separator	Every 100 hrs or annually	Replace more often with ethanol fuel or dirty tanks.	Fuel Filters
Water pump impeller / kit	Every 2–3 seasons (sooner if weak tell‑tale)	Critical for cooling; check housing and key.	Johnson/Evinrude/OMC Water Pump Repair Kits
Anodes (zincs)	Inspect each haul‑out; replace when 50% worn	Match water type (salt/brackish/fresh). Ensure bonding is intact.	Johnson/Evinrude/OMC Anodes
Oil injection (VRO) hoses and filter	Annually	Inspect lines for brittleness/leaks; verify alarm and prime functionality.	Hoses
Propeller & hardware	Seasonally	Check hub integrity, cotter/lock hardware, and remove line from shaft.	Johnson/Evinrude/OMC Propellers
Lower unit seal kit (if water in gear oil)	As needed	Pressure/vacuum test gearcase; replace seals and retest.	Johnson/Evinrude/OMC Lower Unit Seal Kits

*Intervals assume typical recreational use. Severe duty (high hours, sand/silt, heavy loads) may require shorter intervals.

Frequently Used Parts Categories

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

Common Symptoms & Quick Checks

Symptom	Check First	Related Parts
Weak tell‑tale or overheat alarm	Inspect intake screens, thermostat, and water pump impeller.	Water pump kit, thermostat, intake screen/grommets.
Poor acceleration or power loss	Prop hub slip, clogged fuel filter, dirty carbs, or timing issues.	Propeller/hub, fuel filter, carburetor rebuild parts, spark plugs.
Hard starting / rough idle	Verify choke/primer operation, plug condition, and fuel quality.	Spark plugs, primer/choke components, fuel filter, fuel line/primer bulb.
Excessive smoke (2‑stroke)	Check premix ratio or oil‑injection calibration; look for stuck float/needle.	Fuel system parts, oil injection hoses/filters, carburetor needle/seat.
Gearcase noise or milky oil	Drain and inspect gear oil; pressure/vacuum test for leaking seals.	Lower unit seal kit, gear oil, driveshaft/prop shaft seals, shift shaft seal.

FAQs

Are parts interchangeable between different years or platforms?

Some Johnson parts interchange across years within the same platform (e.g., many V4 cooling parts). However, changes in shaft length, ignition, carburation, and gear ratios can affect compatibility. Confirm using your exact model code and serial.

When should I replace the impeller?

As a rule of thumb, replace every 2–3 seasons, or immediately if the tell‑tale weakens, the engine overheats, or you operate in sandy/silty water.

How often should the lower unit gear oil be changed?

Change gear oil every 100 hours or annually, and inspect for water intrusion (milky appearance) or metal shavings that indicate seal or gear wear.

What information do you need to confirm part compatibility?

Provide the full model code from the nameplate, serial number, shaft length, control type (tiller/remote), and any notable options (electric start, oil injection). Photos of the nameplate and the part area help ensure an exact match.

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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.