Carburetor – Fits Tohatsu/Nissan 4-5 HP 4-Stroke (Replaces 3R1-03200-1, 18-7608)
Carburetor – Fits Tohatsu/Nissan 4-5 HP 4-Stroke (Replaces 3R1-03200-1, 18-7608) is backordered and will ship as soon as it is back in stock.
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Worry-free returns
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Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Carburetor – Fits Tohatsu/Nissan 4-5 HP 4-Stroke (Replaces 3R1-0320...
Product Details
This replacement Carburetor – Fits Tohatsu/Nissan 4–5 HP 4-Stroke Outboards is designed for a precise fit on Tohatsu and Nissan 4-stroke outboard motors, primarily in the 4-5 HP range. It also services select 3.5 HP and 6 HP models from the 2000s through current production years.
It serves as a direct interchange for Tohatsu part numbers 3R1-03200-1, 3AS-03200-0, and 3GV-03200-0, Mercury 803522T, and aftermarket references Sierra 18-7608, 18-7365, and Mallory 9-34001.
- Engineered for direct OEM replacement and installation.
- Constructed from durable die-cast aluminum for marine environments.
- Compatible with standard OEM gaskets for a complete seal.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Tohatsu | 3R1-03200-1 |
| Tohatsu | 3AS-03200-0 |
| Tohatsu | 3GV-03200-0 |
| Sierra | 18-7608 |
| Sierra | 18-7365 |
| Mallory | 9-34001 |
| Mercury | 803522T |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
Fits a range of 4-stroke outboards from Tohatsu and their re-badged counterparts sold under the Nissan and Mercury brands.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Tohatsu | MF3.5 | 3.5 | 4-Stroke | 2000s–Present | 3R1-03200-1 | |
| Tohatsu | MFS4 | 4 | 4-Stroke | 2000s–Present | 3R1-03200-1 | |
| Tohatsu | MFS5 | 5 | 4-Stroke | 2000s–Present | 3R1-03200-1 | |
| Nissan | NFS4 | 4 | 4-Stroke | 2000s–Present | 3R1-03200-1 | |
| Nissan | NFS5 | 5 | 4-Stroke | 2000s–Present | 3R1-03200-1 | |
| Mercury | F4M/F5M/F6M | 4–6 | 4-Stroke | 2000s–Present | 803522T | Mercury-badged Tohatsu |
Technical Specs
- Product Type
- Carburetor Assembly
- Installation
- Direct OEM Replacement
- Fuel Type
- Gasoline
- Connection
- Direct Mount
- Housing Material
- Die-Cast Aluminum
- Housing Color
- Silver/Natural Metal
- Fitting Type
- Direct Bolt Pattern
- Warranty
- 1 Year (aftermarket) / Factory Warranty (OEM)
- Other Technical Attributes
- Compatible with standard OEM gaskets
What’s in the Box
- 1 x Carburetor Assembly (3R1-03200-1)
Installation Notes
- Shut off the fuel supply and safely disconnect the fuel line from the carburetor.
- Carefully remove the airbox cover and assembly to access the carburetor.
- Disconnect any throttle linkages or choke controls attached to the carburetor. Note their positions for reassembly.
- Unbolt and remove the old carburetor from the intake manifold. Remove the old gasket and clean the mounting surfaces.
- Install the new carburetor using a new or inspected gasket, ensuring a secure fit.
- Reconnect the throttle linkages, choke controls, and fuel line.
- Prime the fuel system and start the engine. Check for fuel leaks and make any necessary idle adjustments.
Troubleshooting & FAQ
Will this carburetor fit my 6 HP motor?
While designed for 4-5 HP models, this carburetor is listed as compatible with some 6 HP models, such as the Mercury F6M, which is a Tohatsu-built engine. The most reliable way to ensure fitment is to match your original part number to one of the references listed, such as Tohatsu 3R1-03200-1 or Mercury 803522T.
Do I need to purchase a separate gasket?
This component is designed to be fully compatible with standard OEM gaskets. This listing includes the carburetor assembly only. You may reuse your existing gasket if it is in excellent condition, but replacing it is recommended for a leak-free seal.
What are the signs of a faulty carburetor?
Common symptoms of a failing carburetor include difficulty starting, rough or unstable idle, stalling at low speeds, hesitation or bogging on acceleration, excessive fuel consumption, and visible fuel leaks from the carburetor body.
Will I need to tune this carburetor after installing it?
This is a direct-fit replacement, but minor adjustments to the idle speed or air/fuel mixture screw may be required to achieve optimal performance, as every engine can have slight variations in operating conditions.
How is this different from the original Tohatsu or Mercury part?
This is an aftermarket part, meaning it is not made by the original engine manufacturer. However, it is engineered to meet or exceed OEM specifications for form, fit, and function, providing comparable performance and reliability at a better value.
How often should a carburetor be replaced?
Carburetors do not have a set replacement interval. They should be cleaned periodically and replaced only when they are damaged, warped, or clogged to a point where cleaning is no longer effective at restoring function.
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.
Payment & Security
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