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

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

This carburetor assembly is designed to fit Mercury/Mariner 4-5HP 2-stroke outboard engines from 1987–2006, including models with serial numbers 0G710613 through 0T894438 and 0P017000 through 0P400999. It is also compatible with Tohatsu 4-5HP 2-stroke outboard engines as a direct cross-reference for part number 369-03200-2.

Direct Replacements: Mercury 812648T, Mercury 812648, Mercury 3303-812648T, Quicksilver 3303-812648T, and Tohatsu 369-03200-2.

• Installation Method: Direct replacement with an OEM mounting pattern.
• Fuel Compatibility: For use with gasoline (2-stroke premix).
• Core Component: Package includes one complete 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 Diagrams & Catalog.

Mercury/Mariner/Quicksilver

Tohatsu

Technical Specifications

Package Contents

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

Explosion Diagram

Installation Guide

1. Safety First: Disconnect the battery and shut off the fuel supply line to the engine.
2. Disconnect Old Carburetor: Carefully detach the fuel lines, throttle linkage, and any other connections from the original carburetor.
3. Remove Mounting Hardware: Unbolt the old carburetor from the intake manifold. Keep track of nuts and bolts.
4. Prepare Surface: Clean the manifold mounting surface thoroughly, removing any old gasket material or residue.
5. Install New Carburetor: Position the new gasket and carburetor onto the manifold.
6. Secure Hardware: Tighten the mounting bolts evenly to the manufacturer's recommended torque specification to prevent air leaks.
7. Reconnect Lines: Re-attach the fuel lines, throttle linkage, and any other components you previously disconnected.
8. Final Checks: Turn the fuel supply back on and prime the system if necessary. Carefully inspect all connections for fuel leaks.
9. Test Engine: Reconnect the battery, start the engine, and allow it to warm up. Check for a smooth idle and adjust the idle screw if needed.

Troubleshooting & FAQ

Q: How do I know if this carburetor fits my Mercury outboard?

A: Check your engine's model, year, and serial number against the compatibility tables on this page. This part fits specific 4-5HP 2-stroke models from 1987–2006 with serial numbers in the ranges 0G710613-0T894438 and 0P017000-0P400999. Cross-reference your original part number with Mercury 812648T or 3303-812648T to ensure a perfect match.

Q: What are the signs my old carburetor is failing?

A: Common symptoms include difficulty starting, rough or unstable idling, engine stalling at low speeds, poor acceleration, black smoke from the exhaust, and increased fuel consumption. Visual signs like fuel leaks or a heavily corroded exterior also indicate it's time for a replacement.

Q: Is any tuning required after installation?

A: This carburetor is designed as a direct replacement and is pre-set for most applications. However, minor adjustments to the idle mixture or idle speed screw may be necessary to optimize performance for your specific engine and local conditions.

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.