Carburetor Assembly – Fits Tohatsu & Nissan 2.5HP & 3.5HP 2-Stroke and Mercury 2HP, 2.2HP, 2.5HP, 3HP & 3.3HP

Carburetor Assembly – Fits Tohatsu & Nissan 2.5HP & 3.5HP 2-Stroke and Mercury 2HP, 2.2HP, 2.5HP, 3HP & 3.3HP (Replaces 3F0-03100-4, 823040A1)

This carburetor assembly is engineered for Tohatsu and Nissan 2-stroke outboard motors, specifically 2.5HP and 3.5HP models from 2002 to 2005. It also provides a direct fit for a range of Mercury and Mariner 2-stroke, single-cylinder engines including 2HP, 2.2HP, 2.5HP, 3HP, and 3.3HP models, identifiable by their specific serial number ranges.

This unit is a direct replacement for Tohatsu/Nissan part numbers 3F0-03100-4, 3F0-03100-3, 3F0-03100-2, 3F0-03100-1, 3F0-03100-0, 3D5-03100-5, 3D5-03100-4, 3D5-03100-3, 3D5-03100-2, and Mercury part numbers 823040A1, 823040A2, 823040A4, 823040A5, 823040T06, 8M0171810, 3303-8231752, and 3303-815070.

• Installation Method: Direct Replacement
• Fuel Compatibility: Gasoline
• Included Parts: 1 x 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.

Tohatsu Models

Nissan Models

Mercury Models

Technical Specifications

Package Contents

• 1 x Carburetor Assembly (3F0-03100-4/3D5-03100/823040A1)

Installation Guide

1. Safety First: Disconnect the battery terminals and ensure the engine is off and cool. Shut off the fuel supply.
2. Disconnect Lines: Carefully disconnect the fuel lines and any throttle linkages connected to the old carburetor. Note their positions for reassembly.
3. Remove Old Carburetor: Unscrew the mounting bolts holding the carburetor to the intake manifold. Remove the old unit and gasket.
4. Clean Surface: Clean the manifold mounting surface to ensure a proper seal with the new gasket.
5. Install New Carburetor: Position the new gasket and carburetor, then tighten the mounting bolts evenly.
6. Reconnect Lines: Re-attach the fuel lines and throttle linkages to their original positions.
7. Final Checks: Turn the fuel supply back on and check for any leaks. Reconnect the battery.
8. Test: Start the engine and let it warm up. Adjust idle settings if necessary according to your engine's service manual.

Troubleshooting & FAQ

How do I confirm this fits my engine?
To ensure compatibility, check that your original part number is listed in our cross-reference table. For Tohatsu and Nissan models, verify your engine's model, HP, and year match the compatibility chart. For Mercury applications, it is critical to match your engine's serial number with the ranges specified in the table, as fitment depends on it.

What are common signs of a failing carburetor?
Symptoms of a failing carburetor include difficulty starting the engine, rough idling, stalling at low speeds, engine hesitation upon acceleration, and visible fuel leaks from the carburetor body. If you notice any of these issues, it may be time for a replacement.

Is this a direct bolt-on replacement?
Yes, this carburetor assembly is designed as a direct replacement for the original OEM parts listed. It is engineered to fit without requiring any modifications to your engine or fuel system, using the factory mounting points and connections.

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.