Aftermarket Mercury 75-80-90-100HP EFI (1B172291-1B366822) Service Kit | Sawley's Select Marine Parts

🔧 Product Description

Aftermarket major service kit for the Yamaha-derived Mercury 75HP, 80HP, 90HP and 100HP EFI four-stroke inline-four outboard family within serial range 1B172291-1B366822. These engines use the 1.7-litre shared-platform powerhead and the large-gearcase 47-43026Q06 / 8M0100526 water-pump system.

The 75HP and 90HP applications begin at serial 1B172291, while 80HP and 100HP variants are commonly catalogued from approximately 1B227000 within the same upper serial limit. The kit is not suitable for the redesigned 1.7-litre family beginning at 1B366823 or for later 2.1-litre engines.

⚙️ Key Features

• Major service package for 1.7-litre EFI four-stroke inline-four engines

• Covers 75HP, 80HP, 90HP and 100HP variants within the stated serial family

• Includes dual fuel filters, engine oil filter, thermostat, four spark plugs and complete water-pump kit

• Cross-referenced to Yamaha shared-platform service numbers

• Uses the current Mercury 8M0100526 water-pump succession

📋 Kit Contents

• 1 × Complete water-pump repair kit - Mercury/Quicksilver 47-43026Q06; current replacement 8M0100526

• 1 × Thermostat - Mercury 855676-1

• 1 × Primary fuel filter - Mercury 881540

• 1 × Secondary fuel filter - Yamaha 6C5-24251-00; direct Mercury catalogue equivalent 35-892758001

• 1 × Engine oil filter - Mercury/Quicksilver 35-822626Q04; related Q02/Q03/Q05 revisions and current replacement 35-8M0162829

• 4 × NGK LFR5A-11 spark plugs; Mercury/Quicksilver packaged reference 859495Q where catalogued

Water-pump kit component breakdown:

• 2 × O-rings - Mercury 25-21836

• 1 × Quad ring - Mercury 26-45577-1

• 1 × Faceplate gasket - Mercury 27-8M0050720 / earlier 27-43033-1

• 1 × Impeller - Mercury 47-8M0025709 / 47-43026Q02

• 1 × O-ring - Mercury 25-90196

• 1 × Drive key - Mercury 28-8M0032833 / earlier 28-43037

• 1 × Face seal - Mercury 26-8M2014338 / earlier 26-816575A2

• 1 × Stainless faceplate - Mercury 8172761

• 1 × Water-pump gasket - Mercury 27-8172771

• 1 × Face-seal setting tool - Mercury 818769

• Remaining minor seals/washers supplied under the current 15-piece pump-kit revision

🔄 Supersession & Cross Reference

OEM Supersession / Related References:

• Mercury 8M0100526 → Supersedes 47-43026Q06

• Mercury 35-822626Q04 → Related Q02/Q03/Q05 → Current service replacement 35-8M0162829

• Yamaha 6C5-24251-00 ↔ Mercury 35-892758001 - Secondary fuel-filter cross-reference

• NGK LFR5A-11 ↔ Mercury/Quicksilver 859495Q - Spark-plug reference

• Mercury 855676-1 - Thermostat

Verified Aftermarket / Other-Brand Equivalents:

• Sierra 18-3265 - Complete water-pump repair kit equivalent

• GLM 12043 - Complete water-pump repair kit equivalent

• Mallory 9-48313 - Complete water-pump repair kit equivalent

• Recognised aftermarket oil filters may replace 35-8M0162829 only where thread, bypass pressure, anti-drainback valve and filtration specification match the Mercury application

🚤 Compatibility

Commonly used on selected EFI four-stroke models:

• Mercury 75HP - Serial 1B172291-1B366822

• Mercury 90HP - Serial 1B172291-1B366822

• Mercury 80HP - Commonly from approximately 1B227000-1B366822

• Mercury 100HP - Commonly from approximately 1B227000-1B366822

• Corresponding Mariner models using the same 1.7-litre Yamaha-derived platform

Engine Family:

• 1.7-litre inline-four EFI four-stroke

• Yamaha-derived/shared component platform

• Typical model years approximately 2001-2005, subject to serialised market catalogue

Important Exclusions:

• Not for serial 1B366823 and later redesigned 1.7-litre applications unless separately confirmed

• Not for 2.1-litre 75-115HP four-strokes

• Not for carburetted two-stroke 75/80/90HP three-cylinder engines

• Not for OptiMax/DFI models

🔌 Function

Provides the principal scheduled-service components for the engine lubrication, dual-stage fuel filtration, ignition, thermostat and complete water-pump systems. Maintaining both fuel filters is especially important on EFI engines to protect the high-pressure fuel system and injectors from contamination or restriction.

Common signs service is due include:

• Hard starting, unstable idle or restricted fuel delivery

• Contaminated oil or overdue oil-filter replacement

• Worn spark plugs or reduced combustion quality

• Overheating or thermostat malfunction

• Weak cooling-water output, impeller damage or scored pump components

📦 Condition

• Brand-new aftermarket major service kit

• New, unused replacement components

• Current superseding Mercury or Yamaha cross-references may be supplied

• Confirm horsepower, full serial number and 1.7-litre engine family before fitting