Carburetor Assembly for Tohatsu & Nissan 9.9HP, 15HP and 18HP Two-Stroke Outboards — Replaces 3G2-03100-0 and 3G2-03100-2
Carburetor Assembly for Tohatsu & Nissan 9.9HP, 15HP and 18HP Two-Stroke Outboards — Replaces 3G2-03100-0 and 3G2-03100-2 is backordered and will ship as soon as it is back in stock.
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Delivery and Shipping
Delivery and Shipping
Orders are typically processed within 1–2 business days.
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Carburetor Assembly for Tohatsu & Nissan 9.9HP, 15HP and 18HP T...
Carburetor Assembly for Tohatsu & Nissan 9.9HP, 15HP and 18HP Two-Stroke Outboards — Replaces 3G2-03100-0 and 3G2-03100-2 is backordered and will ship as soon as it is back in stock.
Product Details
This aftermarket carburetor assembly is intended as a replacement for selected Tohatsu and Nissan 9.9HP, 15HP and 18HP two-stroke outboard applications. It is associated with Tohatsu M9.9D2, M15D2 and M18E2 models and corresponding Nissan-branded NS9.9D2, NS15D2 and NS18E2 applications.
The principal replacement references associated with this assembly are Tohatsu 3G2-03100-0 and Tohatsu 3G2-03100-2. Confirm the complete engine model and serial information, mounting arrangement and the number stamped on your original carburetor before ordering.
- Product type: Carburetor assembly
- Application: Selected two-stroke outboard engines
- Installation: Replacement installation using the original engine mounting arrangement
- Fuel: Gasoline
- Quantity: 1 carburetor assembly
Part Number References
These manufacturer references are provided for identification and replacement comparison. A number match alone does not replace model and serial-number verification.
| Brand | Reference | Application note |
|---|---|---|
| Tohatsu | 3G2-03100-0 | Primary replacement reference |
| Tohatsu | 3G2-03100-2 | Primary replacement reference |
Engine & Model Compatibility
The following model and horsepower groupings are associated with this carburetor assembly. Verify the exact engine model, serial range and original carburetor before installation.
| Brand | Model | Rated HP | Stroke | Reference | Verification requirement |
|---|---|---|---|---|---|
| Tohatsu | M9.9D2 | 9.9 | 2-Stroke | 3G2-03100-0 / 3G2-03100-2 | Confirm model and original carburetor configuration |
| Tohatsu | M15D2 | 15 | 2-Stroke | 3G2-03100-0 / 3G2-03100-2 | Confirm model and original carburetor configuration |
| Tohatsu | M18E2 | 18 | 2-Stroke | 3G2-03100-0 / 3G2-03100-2 | Confirm model and original carburetor configuration |
| Nissan | NS9.9D2 | 9.9 | 2-Stroke | Compare with the Tohatsu reference | Confirm model and original carburetor configuration |
| Nissan | NS15D2 | 15 | 2-Stroke | Compare with the Tohatsu reference | Confirm model and original carburetor configuration |
| Nissan | NS18E2 | 18 | 2-Stroke | Compare with the Tohatsu reference | Confirm model and original carburetor configuration |
Mercury Cross-Reference Information
Catalog records associate reference 3303-803687T01 with selected Mercury two-cylinder 9.9HP, 15HP and 18HP international models. This information is a cross-reference lead rather than a universal fitment claim; verify the serial range and compare the original carburetor before ordering.
| Model | Rated HP | Serial condition | Reference |
|---|---|---|---|
| Mercury 9.9, 2-cylinder International | 9.9 | 0N059858 & up | 3303-803687T01 |
| Mercury 15, 2-cylinder International | 15 | 0N001590 through 0N055284 | 3303-803687T01 |
| Mercury 15, 2-cylinder International | 15 | 0N055285 & up | 3303-803687T01 |
| Mercury 18, 2-cylinder International | 18 | 0N001590 through 0N055284 | 3303-803687T01 |
| Mercury 18, 2-cylinder International | 18 | 0N055285 & up | 3303-803687T01 |
Technical Specifications
- Product Type
- Carburetor assembly
- Application
- Selected Tohatsu and Nissan two-stroke outboards from 9.9HP to 18HP
- Fuel Type
- Gasoline
- Installation
- Replacement installation
- Primary References
- 3G2-03100-0 and 3G2-03100-2
- Included Quantity
- 1 assembly
What's in the Box
- 1 x Carburetor assembly
Mounting gaskets, additional service parts and engine-specific hardware are not confirmed as included. Reuse or replace these items according to the engine manufacturer's service requirements.
Installation Notes
- Turn the engine off, allow it to cool and disconnect the fuel supply before beginning work.
- Document the routing and adjustment of the fuel lines, throttle linkage and choke connections before removing the original carburetor.
- Disconnect the fuel lines and linkages, then remove the mounting hardware. Prevent debris from entering the intake.
- Clean the mounting surface and install a suitable new gasket if the original gasket is damaged or the service procedure requires replacement.
- Install the replacement assembly in the same orientation as the original and tighten the mounting hardware to the engine manufacturer's specification.
- Reconnect the fuel lines, throttle linkage and choke connections. Confirm that the throttle returns freely to the idle position.
- Prime the fuel system and inspect all connections for leaks before starting the engine.
- Start the engine in a safe, properly ventilated area and verify idle, throttle response and fuel-system sealing. Do not change jets or mixture settings unless directed by the applicable service procedure.
Troubleshooting & FAQ
How do I confirm fitment?
Compare the complete engine model and serial information, the number on your original carburetor and the physical mounting and linkage arrangement with the information above. Horsepower alone is not sufficient to confirm fitment.
Does this carburetor include a gasket?
A mounting gasket is not confirmed as included with this listing. Inspect the existing gasket and follow the applicable service procedure when selecting a replacement.
Will adjustment be required after installation?
Check the engine's idle speed, throttle operation and fuel-system sealing after installation. Any adjustment must follow the manufacturer's specifications for the exact engine model.
What symptoms may indicate a carburetor problem?
Hard starting, unstable idle, stalling, poor acceleration, fuel leakage and inconsistent operation can be associated with a contaminated, worn or incorrectly adjusted carburetor. Check the complete fuel and ignition systems before replacing parts.
Can I clean the original carburetor instead?
Cleaning may help when the problem is caused by deposits or restricted passages. Replacement may be appropriate when the body, throttle components, needle-and-seat assembly or other internal parts are damaged or excessively worn.
Is this an OEM part?
No. This is an aftermarket replacement assembly intended to correspond to the listed manufacturer references. It is not sold as a genuine Tohatsu, Nissan or Mercury-branded component.
Safety & Important Information
- Use the exact engine model and serial information when confirming compatibility.
- Compare the replacement assembly with the original part before installation.
- Work only on a cool engine in a well-ventilated area and keep fuel away from ignition sources.
- Professional installation is recommended if you are not familiar with outboard fuel-system service.
- Do not operate the engine if fuel leaks are present or if the throttle does not return freely.
About Sea Sierra
- Marine Replacement Parts — Parts are selected for common marine repair and replacement applications.
- Application-Focused Listings — Model, horsepower and serial conditions are provided to help you compare the replacement with your original part.
- Support for Fitment Checks — Use the engine identification plate and original component numbers when requesting compatibility assistance.
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