RANSOTO Outboard Carburetor Replacement 3R1-03200-1 for 3.5–6HP Nissan/Tohatsu/Mercury – Direct Fit, OEM-Style

RANSOTO's replacement carburetor 3R1-03200-1 restores proper fuel-air delivery for compatible 3.5–6HP outboard engines.

If your small outboard is running rough, flooding, or idling poorly, this direct-fit RANSOTO carburetor is designed to meet the factory standards for Nissan, Tohatsu and compatible Mercury models. Built to the same fit and function as common OEM references (3R1-03200-1, 803522T variants and others), this unit replaces worn or damaged carburetors to bring back consistent starting, steady idle and smoother acceleration without extensive engine work.

Which engines will this carburetor fit?

This carburetor replaces several OEM numbers and is compatible with many small 4-stroke outboards. It fits Nissan, Tohatsu and Mercury 3.5HP through 6HP four-stroke models including MF3.5, MFS4, MFS5 and NFS4, as listed by the manufacturer. Check your original part number against the replacement references to confirm fit.

• Direct replacement references: 3R1-03200-1, 3AS-03200-0, 3GV-03200-0
• Also cross-references: 803522T, 803522T1, 803522T2 and variants
• Common fit: Nissan/Tohatsu/Mercury 3.5HP–6HP 4-stroke outboards

How does installation and fit work for weekend boat owners?

Installation is typically straightforward for DIYers familiar with small outboard maintenance: remove the old carburetor, transfer any mounting brackets and fuel connectors, then install the replacement. Because the unit is made to factory tolerances, the mounting points and ports align with original fittings, reducing time on the transom. Keep basic tools, a service manual or photos of the original setup on hand to speed the process.

• No major modifications required—bolt-on design matches OEM mounting
• Standard fuel inlet and throttle linkages accept original hoses and clamps
• Recommended: clean fuel lines and new gaskets during installation

What performance improvements can I expect after swapping the carburetor?

Replacing a worn or clogged carburetor restores correct fuel metering, improving start-up reliability, smoother idle and cleaner throttle response. You may notice fewer stalls, reduced flooding and more consistent RPM at idle and under load. While not a tune-up substitute, a fresh carburetor addresses many common fuel-delivery symptoms without major engine work.

• Better cold and hot starting behavior
• Smoother idling and more predictable throttle response
• Reduced fuel overflow and stalling caused by degraded carburetion

What care and warranty support comes with this part?

The carburetor is manufactured to production standards for longevity but benefits from routine maintenance: use fresh, filtered fuel, inspect gaskets and jets, and keep the choke and float mechanism free of debris. RANSOTO backs the product with a six-month warranty and a satisfaction guarantee—contact the seller directly for returns or questions, and keep your order details handy for faster assistance.

• Six-month warranty included with purchase
• Recommended: replace fuel filter and inspect lines when installing
• Customer support available for fitment or return questions

Who is this for: boat owners, fishermen and small watercraft operators who use Nissan, Tohatsu or compatible Mercury 3.5–6HP four-stroke outboards and need a reliable OEM-style replacement carburetor. It's aimed at DIY mechanics and marine service shops looking for a direct-fit component to restore dependable fuel delivery and extend the working life of the motor without costly overhauls.