Carburetor for Tohatsu/Nissan 4–5 HP and Mercury Mariner 4–6 HP 4-Stroke Outboards
Carburetor for Tohatsu/Nissan 4–5 HP and Mercury Mariner 4–6 HP 4-Stroke Outboards is backordered and will ship as soon as it is back in stock.
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Carburetor for Tohatsu/Nissan 4–5 HP and Mercury Mariner 4–6 HP 4-S...
Carburetor for Tohatsu/Nissan 4–5 HP and Mercury Mariner 4–6 HP 4-Stroke Outboards is backordered and will ship as soon as it is back in stock.
Product Details
This aftermarket carburetor assembly is intended for selected Tohatsu and Nissan 4-stroke 4 HP and 5 HP outboards from 1999 onward. Company fitment information also lists selected Mercury Mariner 4-stroke 4 HP, 5 HP, and 6 HP outboards from 2000 onward, along with a Mercury 3.5 HP carburetor application. Because carburetor fitment can vary by model, market, emissions configuration, and serial number, compare the original carburetor and reference number before ordering.
The company reference data lists Tohatsu numbers 3R1-03200-1, 3AS-03200-0, 3R1-03200-1-00, 3GV-03200-0, 3R1032001M, 3R1032000M, 3AS032000M, 3GV032000M, and 3H6032000M. Mercury and Mariner reference data lists numbers including 3303-879818A1, 3303-8M0053669, 803819T1, 803819T2, 876958A1, 879659A1, 879817A1, 803522T, 803522T1, 803522T2, 803522T01, 803522T02, 803522T03, 803522T04-T06, 803522A04, 8M0053670, 853720T25, 8M0167269, 889246T10, 898103T51, and 8M0121978.
- Replacement carburetor assembly for gasoline-fueled marine outboards.
- Designed for the corresponding original mounting and fuel-system arrangement.
- Confirm the exact model, horsepower, stroke, market, and serial-number range before installation.
Part Number Matrix
The following numbers are reference listings associated with this carburetor assembly. A number appearing in the matrix does not by itself confirm fitment for every engine in a horsepower range.
| Brand | Reference Part Number |
|---|---|
| Tohatsu | 3R1-03200-1; 3R1-03200-1-00 |
| Tohatsu | 3AS-03200-0; 3GV-03200-0 |
| Tohatsu | 3R1032001M; 3R1032000M; 3AS032000M; 3GV032000M; 3H6032000M |
| Mercury / Mariner | 3303-879818A1; 3303-8M0053669 |
| Mercury / Mariner | 803819T1; 803819T2; 876958A1; 879659A1; 879817A1 |
| Mercury / Mariner | 803522T; 803522T1; 803522T2; 803522T01; 803522T02; 803522T03 |
| Mercury / Mariner | 803522T04-T06; 803522A04; 8M0053670 |
| Mercury / Mariner | 853720T25; 8M0167269; 889246T10; 898103T51; 8M0121978 |
Engine & Model Compatibility
Use the conditions below together with the part number on your original carburetor. The available company data provides horsepower, stroke, brand, and year-range guidance, but does not provide a complete model-by-model or serial-number fitment list for every reference number.
| Brand | Application | Rated HP | Stroke | Year Guidance | Fitment Note |
|---|---|---|---|---|---|
| Tohatsu | Selected 4 HP and 5 HP outboards | 4–5 HP | 4-Stroke | 1999 and later | Verify the exact model and original carburetor number. |
| Nissan | Selected 4 HP and 5 HP outboards | 4–5 HP | 4-Stroke | 1999 and later | Verify the exact model and original carburetor number. |
| Mercury / Mariner | Selected 4 HP, 5 HP, and 6 HP outboards | 4–6 HP | 4-Stroke | 2000 and later | Market and serial-number variations may apply. |
| Mercury | Selected Mercury 3.5 HP applications | 3.5 HP | 4-Stroke | Not specified | Confirm the exact original part number before purchase. |
Technical Specs
- Product Type
- Carburetor assembly
- Application
- Selected gasoline-fueled marine outboards
- Engine Type
- 4-stroke outboards
- Installation
- Replacement installation using the original mounting and connection arrangement where fitment is confirmed
- Brand Applications
- Tohatsu, Nissan, Mercury, and Mariner applications listed above
- Material
- Not specified in the company product record
- Warranty
- Refer to the seller's current warranty and return terms
What’s in the Box
- 1 x Carburetor assembly
Gasket note: The company reference data identifies Tohatsu/Nissan gasket reference 3H6-02011-0 and Mercury gasket reference 803508013. Gasket inclusion is not confirmed in the product package data; check the existing gasket and replace it as required for your installation.
Installation Notes
- Confirm the engine brand, exact model, horsepower, 4-stroke configuration, year or serial range, and original carburetor reference number before beginning work.
- Make sure the engine is switched off and cool. Follow the engine manufacturer's safety procedures and disconnect the battery where applicable.
- Turn off the fuel supply and disconnect the fuel line carefully. Keep an approved container or absorbent material available for fuel spillage.
- Photograph or label the throttle linkage, springs, fuel hose, and any other connections before removing the original carburetor.
- Remove the original carburetor and gasket. Clean the mounting surface without allowing debris to enter the intake.
- Install the correct gasket for the confirmed application, position the replacement carburetor, and tighten fasteners according to the engine manufacturer's service instructions.
- Reconnect the linkage, springs, fuel hose, and other connections exactly as configured on the original assembly.
- Restore the fuel supply and inspect carefully for leaks before starting the engine.
- Start and test the engine in a safe, well-ventilated marine-service environment. Check idle, throttle response, and fuel leakage. Do not alter factory adjustment settings unless required by the service procedure.
Troubleshooting & FAQ
How do I know if the carburetor may need replacement?
Hard starting, rough idle, stalling, poor acceleration, flooding, black exhaust smoke, or fuel leakage can be signs of a carburetion problem. Check fuel quality, fuel delivery, ignition, and linkage condition first. If cleaning or service does not correct the issue, compare the original carburetor number and mounting arrangement with this replacement.
Does this fit every Tohatsu, Nissan, Mercury, or Mariner engine from 3.5 to 6 HP?
No. The listed horsepower range is not a universal confirmation. Fitment depends on brand, exact model, 4-stroke configuration, production year, market, emissions version, serial number, and the original carburetor reference. Confirm all applicable conditions before ordering.
Is a gasket included?
The company product record identifies gasket references but does not confirm that a gasket is included in the package. Plan to inspect the existing gasket and obtain the correct replacement gasket if needed.
Is this an OEM carburetor?
This listing is for an aftermarket replacement carburetor assembly. The reference numbers are provided for identification and fitment comparison; they do not mean that the replacement is manufactured by the original engine brand.
Will adjustment be needed after installation?
Adjustment or synchronization may be required depending on the engine and service procedure. Follow the manufacturer's instructions and do not change mixture or idle settings without the correct specifications.
What maintenance is recommended?
Use clean, fresh fuel and keep the fuel system free of contamination. For extended storage, follow the engine manufacturer's fuel-stabilization and carburetor-draining instructions.
Safety & Important Information
- Compare the replacement with the original carburetor, including mounting points, linkage arrangement, hose connections, and reference number.
- Do not rely on horsepower alone to confirm fitment.
- Work in a well-ventilated area away from ignition sources, and clean up fuel spills immediately.
- Professional installation is recommended if you are not familiar with outboard fuel-system service.
- Stop operation immediately if fuel leakage, uncontrolled engine speed, or abnormal running occurs.
About Sea Sierra
- Marine replacement parts selected for practical repair and maintenance applications.
- Product information is organized around verified reference numbers and stated application conditions.
- For best results, provide the complete engine model and original part number when requesting fitment assistance.
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