TOP Center Bottom Carburetor Set – Fits Mercury 2-Stroke 40-60 HP (Replaces 821854T4, 821854T5, 821854T6)

TOP Center Bottom Carburetor Set – Fits Mercury 2-Stroke 40-60 HP (Replaces 821854T4, 821854T5, 821854T6)

This is a complete aftermarket carburetor assembly set for Mercury Marine 2-Stroke 40, 45, 55, and 60 HP outboard engines (3-cylinder models, 1999–2006). It provides a reliable and cost-effective solution for restoring fuel system performance.

This set is a direct replacement for Mercury OEM part numbers 821854T4 (Top), 821854T5 (Center), and 821854T6 (Bottom), as well as their predecessors and equivalents.

• Includes a full set of three carburetors (Top, Center, Bottom).
• Designed for gasoline fuel types.
• Engineered for direct-fit installation using factory linkages.

Part Number Cross-Reference

Use this table to confirm equivalent part numbers across OEM and aftermarket brands.

Compatible Engine Models

Confirm your engine model/year in the table below. For Mercury owners, here’s a guide to help you identify your engine’s serial/model: Mercury Serial Number Guide. You can also review exploded diagrams to verify part numbers: Mercury Parts Diagrams & Catalog.

Technical Specifications

Package Contents

• 3 x Carburetor Assembly (Replaces Top, Center, and Bottom)

Explosion Diagram

Installation Guide

1. Safety First: Disconnect the battery and ensure the engine is off and cool. Shut off the fuel supply.
2. Access the Carburetors: Remove the engine cowling or any covers to gain access to the carburetor bank.
3. Document Connections: Before disconnecting, take photos of the fuel lines, throttle linkages, and any electrical connections to ensure correct reassembly.
4. Disconnect Linkages: Carefully detach the throttle and choke linkages from the old carburetors.
5. Disconnect Fuel Lines: Disconnect the fuel inlet and any primer lines. Have a rag ready to catch any spilled fuel.
6. Remove Old Carburetors: Unbolt and remove the complete carburetor assembly from the intake manifold.
7. Install New Set: Mount the new carburetor set onto the intake manifold, ensuring it is seated correctly. Tighten the mounting bolts to the manufacturer's specified torque.
8. Reconnect Lines: Re-attach the fuel lines to the new carburetors.
9. Reconnect Linkages: Re-attach the throttle and choke linkages. Check for smooth, unrestricted movement.
10. Final Checks: Turn the fuel supply back on and check thoroughly for any fuel leaks. Once confirmed leak-free, reconnect the battery.
11. Test Engine: Start the engine in a well-ventilated area. Check for smooth idling and throttle response.
12. Adjust if Necessary: Make any necessary idle or air/fuel mixture adjustments according to your engine's service manual for optimal performance.

Troubleshooting & FAQ

Q: How do I confirm this set fits my specific Mercury outboard?

A: This set is designed for 3-cylinder Mercury 40-60 HP models from 1999-2006. The best way to confirm is to match your existing carburetor part numbers with those listed in our Part Number Cross-Reference table. You can also verify your engine's model and year in the Compatible Engine Models list.

Q: Are gaskets or installation hardware included with this carburetor set?

A: The package contains the three carburetor assemblies as shown. Gaskets or additional installation hardware are not specified as included. We recommend purchasing a separate gasket kit to ensure a proper, leak-free seal during installation.

Q: What are common signs that my old carburetors need replacing?

A: Common symptoms include difficulty starting, rough idling or stalling at low speeds, poor or hesitant acceleration, and a noticeable increase in fuel consumption. Visible fuel leaks or corrosion on the carburetor body are also clear indicators that a replacement is needed.

Q: OEM vs. Aftermarket?

A: This listing is an aftermarket replacement part (not an OEM component). We build to OEM specifications using comparable-grade materials. Production is done in an ISO9002-certified facility, and each batch is inspected for consistent performance.

Q: How fast do you ship and how much does it cost?

A: We offer fast global shipping—typically 5–15 days worldwide—and standard shipping is free. Expedited options are available at checkout depending on your location.

Q: What is your warranty and return policy?

A: This product includes a 1-year warranty against manufacturing defects under normal use. If something goes wrong, contact our support team with your order details. Returns are accepted within our standard return window (unused & in original condition); please see our policy page or reach out for instructions.

Important Notes

• Verify that the product images and specifications match your original part. If discrepancies exist—even if your model is listed—do not proceed with the purchase.
• This product is an aftermarket replacement part and is not an OEM component.
• Professional installation is recommended to ensure safety and optimal performance.

Why Choose JLM MARINE?

• Quality Assured: As a trusted manufacturer for over 20 years, we supply top marine brands globally.
• Fast Global Shipping: Free delivery worldwide in 5–15 days.
• Direct from Manufacturer: Competitive pricing without compromising quality.