Johnson 105HP 2-Stroke Outboard Marine Engine Parts

(13 products)

This page supports Johnson 2-Stroke 105 HP outboard engines. Use it to find compatible parts, service intervals, and troubleshooting guidance for routine upkeep. You can also browse the main Johnson/Evinrude collection, and at the bottom of this page start exploring parts for this specific engine. On the collection pages, use the “Filter & Sort” controls to narrow results by horsepower, year range, and part category.

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How to Identify Your 105 HP Model

Locate the model/serial plate on the transom bracket or swivel bracket (often port side). A secondary decal may be under the engine cowl.
Model codes and suffix letters indicate year features and shaft length (e.g., S ≈ 15 in, L ≈ 20 in, XL ≈ 25 in) as well as control/starting options.
Johnson 105 HP 2‑Stroke models may be V4 crossflow (late 1970s–early 1990s) or 60° loop‑charged V4 (mid‑1990s). Knowing which platform you have improves parts matching.
Commercial variants may list “Commercial/105” on the tag and can use heavy‑duty gearcase components. Verify prop shaft diameter and shaft length when ordering gearcase parts.

Platform Overview

V4 90° Crossflow (Carbureted 2‑Stroke)

Feature	Description
Configuration	V4, 2‑Stroke, crossflow scavenging, carbureted; typical on 100–115 HP and 105 HP commercial models from late 1970s into early 1990s.
Common Models	105 HP commercial variants; related 100/110/115 HP crossflow V4 models in similar years.
Advantages	Proven, rugged design; straightforward carb service; good parts availability.
Notes	Gearcase and water pump components are widely supported; verify prop shaft diameter (1‑3/16 in vs 1‑1/4 in) and shaft length before ordering seals, carriers, and prop hardware.

V4 60° Loop‑Charged (Carbureted 2‑Stroke)

Feature	Description
Configuration	V4, 2‑Stroke, 60° loop‑charged scavenging, carbureted; appeared in early–mid 1990s on many 90–115 HP and some 105/110 HP variants.
Common Models	90–115 HP loop‑charged V4 families; selected 105 HP models in mid‑1990s.
Advantages	Improved breathing over crossflow; strong mid‑range torque; efficient combustion for a 2‑stroke.
Notes	Some cooling and gearcase parts differ from crossflow versions. Confirm platform via model code and mid‑section features before ordering.

Routine Maintenance & Service Parts

Intervals below are general guidelines for 2‑stroke V4s. Always follow the official service manual for your exact model and usage conditions.

Item	Interval*	Remarks	Parts Link
Gear oil (lower unit)	Every 100 hrs or annually	Inspect for water or metal; replace seals if contamination is found.	Lower Unit Seal Kits
Spark plugs	Inspect 50–100 hrs; replace annually	Use correct heat range and gap for your model/platform.	Spark Plugs
Fuel filter (in‑line or under‑cowl)	Every season or 100 hrs	Replace more often with ethanol fuel or if stored outdoors.	Fuel Filters
Water pump impeller/kit	Every 2 seasons (or annually in sandy/silty water)	A weak tell‑tale stream or overheat alarm often indicates impeller wear.	Johnson/Evinrude Water Pump Repair Kits
Anodes (zincs)	Inspect every 3–6 months	Replace when 50% consumed; use proper alloy for fresh/brackish/salt water.	Johnson/Evinrude Anodes
Thermostat & gaskets	2–3 seasons, or if overheat/idle issues occur	Stuck thermostats can cause overheat at idle and poor warm‑up.	Johnson/Evinrude Gaskets
2‑Stroke oiling	Each fill/inspection	Use correct premix ratio (if not oil‑injected) or service oil‑injection system per manual.	Johnson/Evinrude Parts (All)
Propeller & hardware check	Inspect each trip/seasonally	Remove prop to check for fishing line on seal area; inspect thrust washer, spacer, nut, and cotter pin.	Johnson/Evinrude Propellers

Frequently Used Parts Categories

Routine Service Kits — Johnson/Evinrude Service & Maintenance Kits
Cooling System — Water Pump Repair Kits and Impellers
Fuel System — Fuel Filters and Carburetor Parts
Ignition / Electrical — Electrical Items, Starters, Rectifiers
Gearcase & Driveline — Lower Unit Seal Kits, Bearings, Oil Seals
Propellers & Hardware — Johnson/Evinrude Propellers
Corrosion Protection — Johnson/Evinrude Anodes

Common Symptoms & Quick Checks

Symptom	Check First	Related Parts
Weak tell‑tale stream or overheat alarm	Inspect intake screens for debris; verify impeller condition; test thermostat operation.	Water pump kit, impeller, thermostat, anodes/intake screens
Hard starting / rough idle	Check spark plugs and gap; verify fresh fuel and primer bulb; consider carb cleaning/sync.	Spark plugs, fuel filter, carburetor kit
Poor acceleration / power loss	Inspect prop for dings/cavitation; verify compression/spark; check for restricted fuel delivery.	Propeller, spark plugs, fuel filter/carb parts
Excessive smoke (2‑stroke)	Confirm premix ratio or oil‑injection function; check for stuck choke/enrichment.	Spark plugs, fuel system components, choke solenoid parts
Gearcase noise or metal in gear oil	Check for fishing line on prop shaft; inspect seals and bearings; verify correct gear oil fill.	Lower unit seal kit, carrier/shaft bearings, thrust washers

FAQs

Are parts interchangeable between crossflow and loop‑charged V4s?

Some service parts (spark plugs, many gaskets, anodes) may overlap, but cooling, induction, and gearcase items often differ. Always confirm model code, year, and platform (crossflow vs loop‑charged) before ordering.

When should I replace the impeller?

As a rule, every two seasons or sooner if you see a weak tell‑tale stream, overheating, or you operate in sandy or weedy water. Many owners replace it annually as inexpensive insurance.

How often should I change the lower unit gear oil?

Inspect at mid‑season and replace at least annually (or every 100 hours). If the unit was submerged or you find milky oil, change immediately and check seals.

What information helps confirm compatibility?

Provide model and serial numbers, shaft length (L/XL), platform (crossflow vs loop‑charged), prop shaft diameter if known, and any notable options (commercial gearcase, remote vs tiller). Photos of the nameplate and the parts needing replacement are helpful.

Ready to find parts by horsepower, year, and model? Browse the main Johnson/Evinrude collection and use the filters to narrow results for your 105 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.