Carburetor – Fits Tohatsu/Nissan 4/5 HP Outboards (Replaces 3R1-03200-1, 18-7365)

Carburetor – Fits Tohatsu/Nissan 4/5 HP Outboards

This carburetor assembly is a direct-fit replacement for Tohatsu, Nissan, and Mercury 4-stroke outboards ranging from 3.5 to 5 HP. It is engineered to meet or exceed OEM specifications for reliable fuel delivery and performance. It is primarily designed for Tohatsu/Nissan MF, MFS, and NSF series, as well as Mercury models using the 803522T part number series.

This unit directly replaces OEM part numbers including Tohatsu 3R1-03200-1, 3AS-03200-0, Mercury 803522T series, and Sierra 18-7608, ensuring broad compatibility for hassle-free installation.

• Installation: Direct bolt-on replacement
• Primary Fuel Type: Gasoline
• Manufacturing Standard: Produced in an ISO9002 certified factory

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/Nissan Models

Mercury Models

Technical Specifications

Package Contents

• 1 x Carburetor Assembly (Replaces 3R1-03200-1 / 3AS-03200-0)

Explosion Diagram

Installation Guide

1. Ensure the engine is cool. Shut off the fuel supply and disconnect the negative battery terminal for safety.
2. Carefully label and disconnect the fuel inlet hose, throttle linkage, and any choke or vacuum lines attached to the carburetor.
3. Remove the nuts or bolts securing the carburetor to the intake manifold and carefully lift it off.
4. Clean the manifold mounting surface thoroughly, removing all traces of the old gasket material.
5. Place the new gasket onto the manifold, followed by the new carburetor. Reinstall and tighten the mounting hardware evenly.
6. Reconnect the throttle linkage, fuel line, and any other hoses. Ensure all connections are secure.
7. Turn the fuel supply back on and check for any leaks around the fuel line connection.
8. Start the engine. You may need to adjust the idle speed screw according to your engine's service manual specifications.

Troubleshooting & FAQ

Q: How do I confirm this carburetor fits my Tohatsu or Mercury outboard?

A: Start by checking the "Compatible Engine Models" and "Part Number Cross-Reference" tables on this page. This carburetor fits a wide range of 3.5-5 HP 4-stroke models, including the Tohatsu MF/MFS/NSF series and Mercury outboards that use the 803522T part number series. Verifying your part number is the most reliable method.

Q: What are the signs my old carburetor needs replacement?

A: Common signs of a failing carburetor include difficulty starting the engine, rough or unstable idling, stalling at low speeds, poor acceleration, and black smoke from the exhaust. If cleaning your current carburetor doesn't resolve these issues, a full replacement is often the best solution.

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.