Carburetor Assembly – Fits Mercury/Mariner 4-5HP 2-Stroke Outboards (Replaces 812648T, 3303-812648T)

Carburetor Assembly – Fits Mercury/Mariner 4-5HP 2-Stroke Outboards (Replaces 812648T, 3303-812648T)

This carburetor assembly is designed for a direct fit on Mercury/Mariner/Quicksilver 4-5HP 2-stroke outboard engines from 1987–2006. It is compatible with models falling within serial number ranges 0G710613 through 0T894438 and 0P017000 through 0P400999.

This unit is an aftermarket replacement for Mercury OEM parts 812648T, 812648, 3303-812648T, Quicksilver part 3303-812648T, and Tohatsu part 369-03200-2.

• Installation Method: Direct replacement using the OEM mounting pattern.
• Fuel Compatibility: Designed for gasoline (2-stroke premix).
• Primary Component: Includes 1 x Carburetor Assembly.

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 Catalog.

For Tohatsu models, confirm your engine model/year in the table below.

Technical Specifications

Package Contents

• 1 x Carburetor Assembly (Replaces 812648T / 3303-812648T)

Installation Guide

1. Safety First: Ensure the engine is off and cool. Disconnect the spark plug wire to prevent accidental starting.
2. Shut Off Fuel: Turn off the fuel valve and disconnect the fuel line from the carburetor. Have a rag ready for minor spills.
3. Disconnect Linkages: Carefully detach the throttle and choke linkages from the carburetor. Note their positions for reassembly.
4. Unbolt Old Carburetor: Remove the nuts or bolts securing the carburetor to the engine.
5. Remove Carburetor & Gasket: Gently pull the old carburetor and its gasket away from the engine.
6. Clean Mounting Surface: Thoroughly clean the intake manifold surface to ensure a good seal with the new gasket.
7. Install New Gasket & Carburetor: Place the new gasket onto the manifold, followed by the new carburetor assembly.
8. Secure New Carburetor: Tighten the mounting nuts or bolts evenly to secure the carburetor. Do not overtighten.
9. Reconnect Linkages: Reattach the throttle and choke linkages to their original positions.
10. Reconnect Fuel Line: Attach the fuel line to the new carburetor and open the fuel valve.
11. Check for Leaks: Prime the fuel system and inspect for any fuel leaks before starting the engine.
12. Test & Adjust: Reconnect the spark plug wire, start the engine, and allow it to warm up. Make minor idle adjustments if necessary.

Troubleshooting & FAQ

How do I confirm this carburetor fits my Mercury engine?
Check your engine's model, year, and serial number against our "Compatible Engine Models" table. This part is specifically for 4-5HP 2-stroke models from 1987-2006, particularly those with serial numbers 0G710613-0T894438 and 0P017000-0P400999.

What are the signs that my old carburetor is failing?
Common symptoms include difficulty starting, rough or unstable idling, stalling at low speeds, poor acceleration, excessive fuel consumption, or black smoke from the exhaust, all indicating a potential fuel/air mixture problem.

Are any adjustments needed after installation?
This carburetor is designed as a direct replacement and is pre-set to factory specifications. In most cases, it will work out of the box. However, minor idle speed or air/fuel mixture adjustments may be necessary to optimize performance for your specific engine's condition and environment.

OEM vs. Aftermarket?
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.