821854T4 / 821854T5 / 821854T6 Carburetor Assembly Set Fits Mercury Mariner (40 HP, 45 HP, 55 HP, 60 HP)

Product Overview

XR MARINE · CARBURETORS & REPAIR KITS

821854T4 / 821854T5 / 821854T6 Carburetor Assembly Set Fits Mercury Mariner (40 HP, 45 HP, 55 HP, 60 HP)

This XR Marine carburetor assembly set is intended for replacing the top, center and bottom carburetor assemblies on matching Mercury / Mariner 40 HP, 45 HP, 55 HP and 60 HP 2-stroke, 3-cylinder outboard engines. The set corresponds to combination reference numbers 821854T4 (Top), 821854T5 (Center) and 821854T6 (Bottom).

Each carburetor in the set is position-specific and should not be treated as interchangeable between the top, center and bottom mounting locations. Always verify your engine model, serial number and individual carburetor position reference numbers before purchasing.

Product Specifications

Key product details for identification and comparison.

Fitment

The 821854T4 / 821854T5 / 821854T6 Carburetor Assembly Set from XR Marine fits Mercury / Mariner 40 HP, 45 HP, 55 HP and 60 HP 2-stroke, 3-cylinder outboard engines in the applications listed below.

Match your engine identification plate details, serial number and the complete OEM reference numbers for all three carburetor positions (top, center and bottom) before ordering. Because specific model designations and model years are not stated in these application records, confirming the 2-stroke, 3-cylinder configuration and exact carburetor version is essential—horsepower alone is not enough to confirm fitment.

• Brand: Mercury Mariner | Power: 40 HP | Stroke: 2-Stroke | Condition: 3 cylinders; complete model and year not stated
  ! Check conditions
• Brand: Mercury Mariner | Power: 45 HP | Stroke: 2-Stroke | Condition: 3 cylinders; complete model and year not stated
  ! Check conditions
• Brand: Mercury Mariner | Power: 55 HP | Stroke: 2-Stroke | Condition: 3 cylinders; complete model and year not stated
  ! Check conditions
• Brand: Mercury Mariner | Power: 60 HP | Stroke: 2-Stroke | Condition: 3 cylinders; complete model and year not stated
  ! Check conditions

OEM & Part Number References

Use the complete reference number, including its suffix, when comparing parts. Reference numbers do not confirm that every version is interchangeable.

On 3-cylinder applications, the top, center and bottom carburetors have distinct reference numbers and must not be mixed between positions. The references associated with this set are organized below by brand and carburetor position where specified:

What's Included

Check the supplied components before planning your repair.

• Top Carburetor Assembly (OEM Reference: 821854T4)
• Center Carburetor Assembly (OEM Reference: 821854T5)
• Bottom Carburetor Assembly (OEM Reference: 821854T6)

Installation Guide

General installation overview. Follow the service manual for your exact engine and carburetor configuration. Fuel-system work requires the appropriate skills and precautions.

1. Preparation and Position Identification: Ensure the engine is shut off and cool, disconnect the ignition and fuel supply according to your service manual, and work in a well-ventilated area away from ignition sources. Before removing the existing carburetors, clearly label the fuel hoses, linkage rods and mounting positions (Top, Center and Bottom). Compare each supplied carburetor assembly (821854T4 Top, 821854T5 Center, 821854T6 Bottom) against your original units to confirm matching flanges, linkage arms and fuel fittings for each respective position.
2. Position-Specific Mounting and Connection: Remove the old carburetor assemblies following the sequence in your Mercury / Mariner service manual. Install the new top, center and bottom carburetor assemblies strictly into their designated positions—do not swap positions. Connect all fuel lines and throttle/choke linkages as documented, then verify that all levers move smoothly without binding or interference across the full throttle range.
3. Leak Inspection and Synchronization Check: Restore fuel supply and prime the system while inspecting every hose connection, bowl and mating surface across all three carburetors for any sign of fuel leakage. With proper cooling water supplied to the outboard, start the engine and follow your service manual procedure to check carburetor synchronization and idle operation. Shut the engine down immediately if any fuel leak, linkage sticking or abnormal running condition is observed.

Before You Order

A careful fitment check helps you choose the right part the first time.

• Match the full engine model designation on the identification plate.
• Check the engine serial-number range, model configuration and any version restrictions in your official parts catalog, as complete model and year details are not stated in the general horsepower listing.
• Compare the complete OEM reference number, including its suffix. Horsepower or appearance alone is not enough.
• Confirm the package contents and the quantity needed for your repair.
• Verify that your engine is a 2-stroke, 3-cylinder configuration and check the top (821854T4), center (821854T5) and bottom (821854T6) carburetor positions separately—do not treat these position numbers as interchangeable.
• Note that this product is a 3-piece carburetor assembly set and is not a fuel pump assembly.

Need help checking fitment? Have your engine identification details, the existing part number and clear photos ready when you contact XR Marine.

Why XR Marine

Frequently Asked Questions

Answers to common questions about this product and its application.