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 complete carburetor set is designed for Mercury Marine 2-Stroke 40, 45, 50, 55, and 60 HP 3-cylinder outboard engines manufactured between 1999 and 2006.

It serves as a direct replacement for the original top, center, and bottom carburetors, ensuring a precise fit and restoring engine performance. This set is engineered to match OEM specifications for reliable fuel delivery.

• Complete Kit: Includes all three carburetors (Top, Center, and Bottom) for a full replacement.
• Installation: Mounts directly to factory locations and connects with OEM linkages.
• Fuel Compatibility: Designed for use with standard gasoline fuel types.

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 positions)

Installation Guide

1. Safety First: Disconnect the battery and ensure the fuel supply is shut off before beginning work.
2. Remove Cowling: Take off the engine cover to access the carburetors.
3. Disconnect Linkages: Carefully detach the throttle and choke linkages from the carburetor assembly. Note their positions for reassembly.
4. Remove Fuel Lines: Disconnect the fuel lines from each carburetor. Have a rag ready to catch any residual fuel.
5. Unbolt Carburetors: Remove the mounting bolts securing the old carburetors to the engine block.
6. Install New Carburetors: Mount the new top, center, and bottom carburetors, ensuring they are correctly positioned. Tighten the mounting bolts to the manufacturer's recommended torque.
7. Reconnect Lines & Linkages: Re-attach the fuel lines and throttle/choke linkages to the new carburetors.
8. Final Check: Verify all connections are secure and operate the throttle linkage manually to ensure smooth movement without binding.
9. Test Engine: Reconnect the battery and prime the fuel system. Start the engine in a well-ventilated area and check for leaks, then adjust the idle if necessary.

Troubleshooting & FAQ

How do I confirm this carburetor set will fit my Mercury engine?
Start by checking your engine's model, horsepower (40-60 HP), and year (1999-2006). This set is for 3-cylinder, 2-stroke models. Cross-reference your existing carburetor part numbers with those listed in our Part Number Cross-Reference table for the most accurate match.

What are the signs of a failing carburetor that this set can fix?
Common symptoms include difficulty starting, rough idling, stalling at low speeds, engine hesitation or sputtering during acceleration, and excessive fuel consumption. Replacing worn or clogged carburetors can resolve these fuel delivery issues.

Does this set include all three carburetors?
Yes, this is a complete set that includes one top, one center, and one bottom carburetor, designed to replace all three on your engine at once for balanced performance.

Is this an OEM part?
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.

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

What is your warranty and return policy?
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.