Carburetor – Fits Mercury, Tohatsu, Nissan 2-6 HP Outboards (Replaces 3R1-03200-1, 853720T25)

Carburetor – Fits Mercury, Tohatsu, Nissan 2-6 HP Outboards

This carburetor is designed for a wide range of Mercury, Mariner, Tohatsu, and Nissan 4-stroke outboards from 2 to 6 HP. It serves as a direct-fit replacement, engineered to restore original engine performance and fuel efficiency.

This unit directly replaces Mercury part numbers 853720T25 and 803819T03, and Tohatsu/Nissan part numbers 3R1-03200-1, 3AS-03200-0, and 3GV-03200-0.

• Installation Method: Direct replacement with a direct-mount connection.
• Housing Material: Constructed from machined aluminum alloy for durability.
• Primary Function: Ensures a precise air-fuel mixture for smooth combustion and reliable operation.

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.

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

Technical Specifications

Package Contents

• 1 x Carburetor (3R1-03200-1/853720T25)

Installation Guide

Professional installation is recommended. The following are general steps:

1. Safety First: Ensure the engine is off and cool. Disconnect the battery and shut off the fuel supply at the tank.
2. Access the Carburetor: Remove the engine cowling or any covers blocking access to the carburetor.
3. Disconnect Lines: Carefully note the routing of and then disconnect the fuel lines, throttle linkages, and any other connections to the old carburetor.
4. Remove Old Unit: Unbolt and remove the old carburetor from the intake manifold. Be careful not to drop any hardware into the engine.
5. Clean Surface: Clean the manifold mounting surface and remove any old gasket material.
6. Install New Carburetor: Mount the new carburetor with a new gasket. Securely tighten the mounting bolts evenly.
7. Reconnect: Reattach the fuel lines, throttle linkages, and any other connections. Ensure all fittings are secure to prevent leaks.
8. Test for Leaks: Turn the fuel supply on and prime the system if necessary. Carefully inspect for any fuel leaks before starting the engine.
9. Final Checks: Reconnect the battery, start the engine, and let it warm up. Check for smooth idling and throttle response. Minor idle speed adjustments may be needed.

Troubleshooting & FAQ

Q: How do I confirm this fits my engine?

A: Check the "Part Number Cross-Reference" and "Compatible Engine Models" tables on this page. It is crucial to match your engine's model and original part number to ensure compatibility. This carburetor replaces Mercury part numbers 853720T25 and 803819T03, and Tohatsu/Nissan numbers 3R1-03200-1, 3AS-03200-0, and 3GV-03200-0.

Q: What are the signs of a failing carburetor?

A: Common symptoms include difficulty starting the engine, rough idling, stalling at low speeds, engine hesitation upon acceleration, and increased fuel consumption. If you notice these issues, your carburetor may need inspection or replacement.

Q: Is any adjustment needed after installation?

A: This carburetor is designed to match OEM specifications, but minor idle speed or air-fuel mixture adjustments may be necessary depending on your specific engine and environmental conditions to achieve optimal performance.

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.