Quicksilver 8HP 4-Stroke Outboard Engine Parts

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This page focuses on Quicksilver 8HP 4-Stroke outboard engines. Use it to find compatible parts and practical service information, including maintenance tips, common replacement items, and troubleshooting guidance. You can also browse the main Mercury collection for a broader selection of compatible components. Scroll to the bottom of this 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 8HP Model

Locate the serial/nameplate on the transom bracket or swivel bracket. Note the full serial number and any model suffixes.
Decode suffix letters for shaft length (S = 15", L = 20"), starting (manual vs. electric), and control type (tiller vs. remote).
Confirm it’s a 4-stroke: look for an engine oil dipstick and a spin-on oil filter under the cowl; the cowl usually says “FourStroke”.
Many 8HP 4-stroke models share a platform with 9.9HP variants; record your serial number to verify parts against the correct production range.

Platform Overview

8HP 4-Stroke Small Twin

Feature	Description
Configuration	Inline 2-cylinder, carbureted 4-stroke with manual or electric start, tiller or remote options.
Common Models	8HP FourStroke family (short/long shaft). Many components interchange with 9.9HP FourStroke of the same generation.
Advantages	Quiet operation, low fuel consumption, dependable idle, and easy portable rigging.
Notes	Service items like oil filters, fuel filters, anodes, and impellers are routine wear items. Always verify parts using your serial number, especially around mid-2000s updates.

Routine Maintenance & Service Parts

Intervals below are general guidelines for typical recreational use. Always follow the official service manual for your exact model and operating conditions.

Item	Interval*	Remarks	Parts Link
Engine oil + filter	Every 100 hours or annually	Use marine FC‑W 4‑stroke oil (commonly 10W‑30 or 25W‑40). Warm engine before draining; confirm the new filter gasket seats properly.	Oil Filters
Gear oil (lower unit)	Every 100 hours or annually	Inspect for water (milky oil) or metal. Replace drain screw gaskets during service.	Mercury Lower Unit Seal Kits
Spark plugs	Inspect every 100 hours; replace 200 hours or as needed	Check gap and condition; replace if fouled, worn, or corroded.	Spark Plugs
Inline fuel filter	Inspect 50 hours; replace 100 hours or if restricted	Replace sooner if using ethanol fuel or if debris/water is present.	Fuel Filters
Water pump impeller/kit	Every 2 seasons (or 100–200 hours)	Replace sooner if tell‑tale is weak, engine overheats, or after sandy/silty use.	Mercury Water Pump Repair Kits
Anodes (zinc/aluminum/magnesium)	Inspect every 50 hours; replace at ~50% wastage	Match anode material to your water type (salt, brackish, or fresh) and keep electrical bonding intact.	Anodes

Frequently Used Parts Categories

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

Common Symptoms & Quick Checks

Symptom	Check First	Related Parts
Weak tell‑tale or overheat alarm	Inspect water intake screens for blockage; verify tell‑tale hose is clear; check impeller condition and thermostat.	Water pump impeller kit, intake screen, thermostat
Hard starting / rough idle	Prime the bulb until firm; confirm choke/enrichment works; drain stale fuel; inspect plugs and fuel filter.	Inline fuel filter, spark plugs, fuel hose/primer bulb, carb service parts
Poor acceleration / power loss	Check prop for damage or wrong pitch; verify tank venting; look for kinked fuel line or air leaks.	Propeller, prop hub hardware, fuel filter, fuel line/vent
Gearcase noise or metal in gear oil	Verify oil level/condition; look for milky oil (water intrusion); check drain screw gaskets and propshaft seal area.	Gear lube, drain screw gaskets, lower unit seal kit
Vibration at mid‑range	Inspect prop for bent blades or fouling; ensure prop nut/washer are tight; confirm engine mounting and clamps are secure.	Propeller, prop nut/washer, mounting hardware

FAQs

Are parts interchangeable between 8HP and 9.9HP 4‑stroke models?

Many routine service items (filters, impellers, anodes) are shared across the 8/9.9HP family, but changes across production years mean you should always confirm by serial number before ordering.

When should I replace the impeller?

As a rule of thumb, replace the impeller every 2 seasons or sooner if you notice a weak tell‑tale, overheat warnings, or frequent operation in sandy/silty water.

How often should I change gear oil?

Change lower unit gear lube every 100 hours or annually. If the oil appears milky or contaminated, service immediately and inspect seals and drain screw gaskets.

What information helps confirm part compatibility?

Provide the engine brand and horsepower, 4‑stroke designation, full serial number, shaft length (S/L), start type (manual/electric), and control type (tiller/remote). Photos of the nameplate and the part to replace are also helpful.

Ready to find the right parts by horsepower, year, and model? Browse our main Mercury outboard collection for a wide selection of compatible components.

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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.