Aftermarket Mercury 40HP Twin Carb Models Service Kit | Sawley's Select Marine Parts

🔧 Product Description

Aftermarket Mercury 40 HP Twin-Carburettor Two-Stroke Service Kit - Kit Reference: Application-matched twin-carb kit

Comprehensive aftermarket routine-maintenance kit assembled for 40 HP Japanese/Yamaha-built twin-cylinder or three-cylinder twin-carburettor two-stroke outboard as identified by model applications. It combines the ignition, cooling, filtration and drain-sealing components listed below so the main scheduled-service items can be renewed together.

⚙️ Key Features

Kit contents:

• 2 × NGK spark plug - Part Number: BR8HS-10

• 1 × Thermostat - Part Number: 814554M

• 1 × Thermostat-cover gasket - Part Number: 814555M

• 1 × Fuel filter - Part Number: 35-826964T

• 1 × Water-pump repair kit - Part Number: 84363M (related 84363T; Yamaha 679-W0078-A1-00, 679-W0078-A0-00, 679-W0078-01-00, 679-W0078-00-00, 6F5-W0078-00-00 and 6F5-W0078-A0-00)

• 3 × Gearcase drain-screw gasket - Part Number: 81987M

🔄 Supersession & Cross Reference

OEM Supersession Chain:

• Mercury/Quicksilver hyphenated and compact-number formats identify the same listed component

OEM / Related Numbers:

• BR8HS-10

• 814554M

• 814555M

• 35-826964T

• 84363M

• 81987M

Aftermarket / Verified Equivalents:

• Recmar and Yamaha component-level equivalents

• Yamaha 679-W0078-A1-00 complete water-pump kit family

🚤 Compatibility

Commonly used on:

• Mercury/Mariner 40 HP Japanese-built twin-carburettor two-stroke models using thermostat 814554M and pump kit 84363M

Typically suits:

• HP Range: 40 HP

• Engine Type: Japanese/Yamaha-built twin-cylinder or three-cylinder twin-carburettor two-stroke outboard as identified by model

• Year / Serial Range: Model/serial controlled; confirm twin-carburettor arrangement and Yamaha-derived pump family

• Identification: Confirm the complete engine model and serial number before ordering, particularly where shaft length, gear ratio or gearcase family changes the water-pump components.

🔌 Function

Provides the principal routine-service components used to maintain correct ignition, fuel delivery, cooling-water flow and fluid sealing. Renewing these items at the proper service interval helps support reliable starting, stable running, normal operating temperature and protection against contaminated oil or water-pump failure.

Common signs service is required:

• Hard starting, misfire, poor idle or reduced throttle response

• Restricted fuel flow, dirty filters or fuel starvation under load

• Weak or intermittent tell-tale flow, rising temperature or an overheat warning

• Cracked, hardened or missing impeller vanes

• Oil or gear-lubricant leakage from deteriorated drain-plug seals

• Scheduled annual, 100-hour or storage-return maintenance interval reached

📦 Condition

• Brand-new aftermarket service kit

• Supplied as new replacement components

• Supplied in suitable retail or equivalent packaging