Carburetor – Fits Tohatsu/Nissan 3.5-5 HP (Replaces 3R1-03200-1, 18-7365)
Carburetor – Fits Tohatsu/Nissan 3.5-5 HP (Replaces 3R1-03200-1, 18-7365) is backordered and will ship as soon as it is back in stock.
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Worry-free returns
You may return most new, unopened items within 7 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).
You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).
If you need to return an item, simply login to your account, view the order using the "Complete Orders" link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.
Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Carburetor – Fits Tohatsu/Nissan 3.5-5 HP (Replaces 3R1-03200-1, 18...
Product Details
This replacement Carburetor – Fits Tohatsu/Nissan 4/5 HP Outboards is designed for Tohatsu/Nissan 3.5–5 HP, 4-Stroke MF/MFS/NSF series outboards, including MF3.5, MFS4, MFS5, NFS4, and NFS5 models. It is also compatible with Mercury 3.5–5 HP, 4-Stroke outboards that use the Mercury 803522T part number series.
It serves as a direct interchange for Tohatsu numbers 3R1-03200-1-00, 3R1-03200-1, and 3AS-03200-0; Mercury numbers 803522T, 803522T1, 803522T2, 803522T03, and 803522T04-T06; and aftermarket equivalents including Sierra 18-7608, AM982217, and MAL9-34001.
- Engineered for direct bolt-on replacement.
- Produced in an ISO9002 certified factory to ensure quality.
- Designed for gasoline-fueled marine environments.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Tohatsu | 3R1-03200-1-00 |
| Tohatsu | 3R1-03200-1 |
| Tohatsu | 3AS-03200-0 |
| Mercury | 803522T |
| Mercury | 803522T1 |
| Mercury | 803522T2 |
| Mercury | 803522T03 |
| Mercury | 803522T04-T06 |
| Sierra | 18-7608 |
| AM | AM982217 |
| Mallory Marine | MAL9-34001 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
This carburetor fits a wide range of 4-stroke Tohatsu and Nissan outboards rated at 3.5, 4, and 5 HP across the MFS and NSF series.
| Brand | Model | Rated HP | Stroke | OEM Part No. | Notes |
|---|---|---|---|---|---|
| Tohatsu | MF3.5 | 3.5 | 4-Stroke | 3R1-03200-1 | |
| Tohatsu | MFS4 | 4 | 4-Stroke | 3R1-03200-1 | |
| Tohatsu | MFS4A | 4 | 4-Stroke | 3R1-03200-1 | |
| Tohatsu | MFS4A2 | 4 | 4-Stroke | 3R1-03200-1 | |
| Tohatsu | MFS4B | 4 | 4-Stroke | 3R1-03200-1 | |
| Tohatsu | MFS4C | 4 | 4-Stroke | 3R1-03200-1 | |
| Tohatsu | MFS5 | 5 | 4-Stroke | 3R1-03200-1 | |
| Tohatsu | MFS5A | 5 | 4-Stroke | 3R1-03200-1 | |
| Tohatsu | MFS5A2 | 5 | 4-Stroke | 3R1-03200-1 | |
| Tohatsu | MFS5B | 5 | 4-Stroke | 3R1-03200-1 | |
| Tohatsu | MFS5C | 5 | 4-Stroke | 3R1-03200-1 | |
| Nissan | NSF4A | 4 | 4-Stroke | 3R1-03200-1 | |
| Nissan | NSF4A2 | 4 | 4-Stroke | 3R1-03200-1 | |
| Nissan | NSF4B | 4 | 4-Stroke | 3R1-03200-1 | |
| Nissan | NSF4C | 4 | 4-Stroke | 3R1-03200-1 | |
| Nissan | NSF5A | 5 | 4-Stroke | 3R1-03200-1 | |
| Nissan | NSF5A2 | 5 | 4-Stroke | 3R1-03200-1 | |
| Nissan | NSF5B | 5 | 4-Stroke | 3R1-03200-1 | |
| Nissan | NSF5C | 5 | 4-Stroke | 3R1-03200-1 | |
| Mercury | (Model Varies) | 3.5 | 4-Stroke | 803522T25 | For S/N 0R44803 and up |
| Mercury | (Model Varies) | 4 | 4-Stroke | 8M0053670 | For all US models |
| Mercury | (Model Varies) | 5 | 4-Stroke | 803522T01 | US EPA lower S/Ns |
| Mercury | (Model Varies) | 5 | 4-Stroke | 803522T02 | US EPA higher S/Ns |
| Mercury | (Model Varies) | 5 | 4-Stroke | 803522T03 | All US S/Ns |
| Mercury | (Model Varies) | 5 | 4-Stroke | 803522T04 | EU engine higher S/Ns |
| Mercury | (Model Varies) | 5 | 4-Stroke | 803522A04 | EU lower S/Ns |
Technical Specs
- Product Type
- Carburetor Assembly
- Installation
- Direct bolt-on replacement
- Fuel Type
- Gasoline
- Connection
- Fuel line input, manifold mount
- Housing Material
- Zinc alloy
- Housing Color
- Silver/metallic
- Fitting Type
- Fuel line connector
- Warranty
- Manufacturer dependent, typically 1 year
- Other Technical Attributes
- ISO9002 certified factory production
What’s in the Box
- 1 x Carburetor Assembly (3R1-03200-1/3AS-03200-0)
Installation Notes
- Ensure the engine is off and cool. Disconnect the negative battery terminal for safety.
- Turn off the fuel supply and carefully disconnect the fuel line from the old carburetor, having a rag ready for any spillage.
- Note or photograph the linkage and hose connections before removing them.
- Unbolt and remove the old carburetor from the intake manifold. Remove the old gasket and clean the mounting surface thoroughly.
- Install the new gasket and mount the new carburetor, tightening the bolts to the manufacturer's recommended torque.
- Reconnect all linkages, springs, and hoses to their original positions.
- Reconnect the fuel line and turn the fuel supply on. Check for any leaks.
- Reconnect the battery. Start the engine and check for smooth idling and operation. Adjust idle speed if necessary.
Troubleshooting & FAQ
How do I know if my carburetor needs replacing?
Common signs of a faulty carburetor include difficulty starting, rough idling, stalling, poor acceleration, black smoke from the exhaust (running rich), or fuel leaks. If cleaning and tuning do not solve these issues, a replacement is often the best solution.
Is any adjustment needed after installation?
This carburetor is designed as a direct-fit replacement and should perform well out of the box. However, minor adjustments to the idle speed or air/fuel mixture may be necessary depending on your specific engine's condition and local altitude.
What is the difference between this and the original Tohatsu/Mercury part?
Functionally, there is no difference. This is an aftermarket part built to the same specifications and performance standards as the original equipment. It offers a cost-effective solution without compromising on fit or function.
What maintenance is recommended for a new carburetor?
To extend the life of your new carburetor, always use fresh, clean fuel and a quality fuel filter. If the engine will be stored for an extended period, it's best to run the carburetor dry or use a fuel stabilizer to prevent gum and varnish buildup.
OEM vs. Aftermarket?
This listing is an aftermarket replacement (not OEM). Built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, batch-inspected for consistency.
Shipping speed & cost
We ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.
Warranty & returns
Covered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact support with your order details. Returns are accepted within our standard window (unused & in original condition). See our policy page or reach out for instructions.
Safety & Important Info
- Verify images/specifications vs your original part. If anything differs—even if your model appears compatible—do not purchase.
- This is an aftermarket replacement, not an OEM component.
- Professional installation is recommended for safety and performance.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.
- Fast Global Fulfillment — Free standard delivery to most regions in 5–15 days.
- Manufacturer-Direct Value — Fair pricing without compromising on materials or QC.
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