3R4-03200-1 Carburetor Carb Assy for Mercury Tohatsu | JLM Marine

Carburetor Assembly – Fits Mercury Mariner 4HP, 5HP & 6HP (4-Stroke)

This aftermarket carburetor assembly is designed for Mercury Mariner 4-stroke outboards, including 4HP, 5HP, and 6HP models. It delivers reliable fuel mixing and engine performance, making it an ideal replacement for worn or damaged OEM carburetors.

Direct Replacement for OEM Part Number: 3R4-03200-1. Also replaces Tohatsu equivalent part number 3R4-03200-1, ensuring broad compatibility across multiple engine configurations.

• Complete carburetor assembly with gasket for easy installation
• Enables performance upgrade: turn your 4HP/5HP engine into 6HP output
• Precision-engineered for optimal fuel delivery and throttle response

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.

Technical Specifications

Package Contents

• Carburetor Assembly (Complete)
• Gasket (Part No. 27-803508013)

Installation Guide

1. Disconnect the fuel line from the old carburetor and ensure the engine is off and cool.
2. Remove the air intake cover and air filter assembly to access the carburetor mounting.
3. Disconnect the throttle linkage and choke cable from the old carburetor. Take note of their positions for reassembly.
4. Unbolt the old carburetor from the intake manifold using the appropriate socket or wrench.
5. Remove the old gasket and clean the mounting surface thoroughly to ensure a proper seal.
6. Install the new gasket (included) onto the intake manifold, aligning all bolt holes.
7. Position the new carburetor onto the gasket and hand-tighten the mounting bolts.
8. Torque the mounting bolts evenly in a cross pattern to manufacturer specifications to prevent warping.
9. Reconnect the throttle linkage and choke cable to the new carburetor, ensuring smooth operation.
10. Attach the fuel line securely to the carburetor inlet and check for any kinks or damage.
11. Reinstall the air filter assembly and air intake cover, ensuring all clamps are tight.
12. Prime the fuel system and start the engine. Adjust idle speed and mixture settings as needed for optimal performance.

Troubleshooting & FAQ

Q: How do I confirm this carburetor fits my Mercury engine?
A: Cross-reference your engine's model and serial number with the compatibility table above. Verify that your OEM carburetor bears part number 3R4-03200-1. You can also consult Mercury's parts diagrams using the links provided in the Compatible Engine Models section.

Q: Can this carburetor really upgrade my 4HP or 5HP engine to 6HP?
A: This carburetor is designed to flow fuel for 6HP output and is commonly used for performance upgrades on 4HP and 5HP Mariner engines. Actual power increase depends on engine condition, propeller pitch, and other factors. Consult a marine technician if you're unsure about compatibility.

Q: What are the signs that my carburetor needs replacement?
A: Common symptoms include rough idling, difficulty starting, poor acceleration, black smoke from the exhaust, or fuel leaking from the carburetor body. If cleaning and adjustment don't resolve these issues, replacement is recommended.

Q: How often should I replace or service my carburetor?
A: Carburetors don't have a fixed replacement interval but should be inspected annually. Clean the carburetor every season or after 100 hours of use. Replace it if internal passages are clogged beyond cleaning, if gaskets are deteriorated, or if performance issues persist.

Q: Is this an OEM or aftermarket carburetor?
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.