Force 2-Stroke 105HP Outboard Marine Engine Parts

(8 products)

This page is dedicated to Force 2-Stroke 105HP outboard engines. Use it to find compatible parts and practical service information. Below you’ll find maintenance tips, common replacement parts, and troubleshooting guidance. You can also browse our main Force collection at any time. Scroll to the bottom of the page to start browsing parts for this engine. 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 105HP Model

Find the identification plate on the port side swivel bracket or transom clamp. Record the full model code and serial number.
Decode the model suffix letters/numbers (which can indicate production revision, year range, shaft length, or control type). Match parts by the exact code on your plate.
Force 105HP engines from different years may carry codes such as 1055HA, 1056/1057 HA–HD, 1056/1057 HE–HF, 1058 HA–HC, and 1058/1059 HD–HE. Use these codes when selecting carb kits, ignition parts, and gaskets.
These are 2‑stroke outboards with multiple carburetors. Count the carburetors and note cowl/ignition style to ensure the correct kits and electrical components.

Engine Overview

Force 105HP 2‑Stroke Platform

Feature	Description
Configuration	Carbureted 2‑stroke inline (3‑ or 4‑cylinder depending on model year), premix or oil‑injection (verify on your engine).
Common Models	Examples include 1055HA; 1056–1057 HA/HB/HC/HD; 1056–1057 HE/HF; 1058 HA/HB/HC; and 1058–1059 HD/HE.
Advantages	Simple, serviceable design with strong mid‑range performance; widely available routine‑service parts.
Notes	Many maintenance items cross‑fit across nearby Force horsepower families (e.g., 90–120), but carb, ignition, and gearcase parts often follow the exact model code and year. Confirm using your ID plate.

Routine Maintenance & Service Parts

Intervals below are general guidelines; always follow the official service manual for your exact model and operating conditions.

Item	Interval*	Remarks	Parts Link
Gear oil (lower unit)	Every 100 hours or annually	Inspect for water intrusion (milky oil); replace drain/fill plug seals.	Force Lower Unit Seal Kits
Spark plugs	Every season or 100 hours	Check heat range and gap to spec; inspect for fouling.	Spark plug
Fuel filter / inline filter	Every 100 hours or annually	Replace more often with stale/contaminated fuel; verify flow direction.	Fuel Filters
Water pump impeller/kit	Every 100 hours or annually	Replace sooner if stream is weak or you operate in sand/silt.	Force Water Pump Repair Kits
Anodes (zincs)	Inspect every 50 hours; replace as needed	Replace when ~50% consumed; match material to water type (aluminum/magnesium/zinc).	Anodes
Carburetor service/rebuild	Every 2–3 seasons or as needed	Clean, sync, and replace gaskets/needles if idle quality or fuel economy degrades.	Carburetor
Oil injection system (if equipped) / premix check	Every season	Most Force models run 50:1 premix. If oil‑injected, bleed and inspect lines and clamps.	Hoses
Thermostat/cooling check	Annually	A stuck‑open stat can cause cold running and excess smoke; verify telltale strength.	Force Outboard Parts
Propeller & hub inspection	Each trip / as needed	Check for dings, bent blades, or hub slip (over‑revving with poor thrust).	Propellers

Common Symptoms & Quick Checks

Symptom	Check First	Related Parts
Weak telltale stream or overheat alarm	Inspect intake screens for debris; verify water pump impeller condition; test thermostat operation.	Water pump kit, thermostat, intake screen, anodes
Poor acceleration / loss of power	Check fuel quality, fuel filter, and primer bulb; clean/sync carburetors; inspect prop for hub slip.	Fuel filter, carburetor kit, spark plugs, propeller
Hard starting / rough idle	Verify choke/enricher function; inspect for air leaks in fuel lines; adjust idle mixture per manual.	Carburetor kit, hoses, fuel filter, spark plugs
Excessive smoke (2‑stroke)	Confirm 50:1 fuel/oil ratio (if premix); if oil‑injected, check pump/line integrity; ensure thermostat isn’t stuck open.	Hoses, thermostat, spark plugs
Gearcase noise or metal in gear oil	Inspect prop shaft for fishing line; check seals for leaks; change oil and monitor.	Lower unit seal kit, bearings, gear oil drain plug seals

FAQs

Are parts interchangeable across different years or 105HP platforms?

Routine items like impellers, anodes, and many gaskets often cross‑fit multiple Force models, but carburetor, ignition, and gearcase components can vary by exact model code and year. Always match parts using the ID plate information.

When should I replace the impeller?

As a rule, replace the impeller every 100 hours or annually. In sandy or silty water, shorten the interval. Replace sooner if the telltale stream weakens or you encounter overheat warnings.

How often should lower unit gear oil be changed?

At least once per season or every 100 hours. If the oil looks milky or smells burnt, service immediately and inspect seals.

What information do you need to confirm part compatibility?

Please provide the full model code and serial number from the nameplate, shaft length, approximate year, carburetor count, and any casting or component numbers. Photos of the nameplate and the part needing replacement are very helpful.

Ready to find parts by horsepower, year, and model? Browse our main Force catalog and use the filters to narrow to your 105HP 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.