Carburetor Assembly – Fits Tohatsu/Nissan 9.9-18HP Two-Stroke (Replaces 3G2-03100-0, Sierra 18-7848)
Carburetor Assembly – Fits Tohatsu/Nissan 9.9-18HP Two-Stroke (Replaces 3G2-03100-0, Sierra 18-7848) 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).
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Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Carburetor Assembly – Fits Tohatsu/Nissan 9.9-18HP Two-Stroke (Repl...
Product Details
This is a direct replacement Carburetor Assembly designed for a precise fit on Tohatsu and Nissan 9.9HP, 15HP, and 18HP 2-Stroke outboard engines, including models M9.9D2, M15D2, M18E2, NS9.9D2, NS15D2, and NS18E2. It is engineered to restore original fuel delivery performance and efficiency.
This assembly provides a direct interchange for Tohatsu part numbers 3G2-03100-0, 3G2-03100-1, 3G2-03100-2, 3G2-03100-3, and 3G2-03100-5, as well as Sierra part 18-7848.
- Installs directly onto factory mounting points with a gasket seal.
- Constructed from a high-quality aluminum alloy for durability.
- Includes all necessary internal jets and passages as per OEM specifications.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number | Notes |
|---|---|---|
| Tohatsu | 3G2-03100-0 | Primary OEM reference |
| Tohatsu | 3G2-03100-1 | Superseded part |
| Tohatsu | 3G2-03100-2 | Superseded part |
| Tohatsu | 3G2-03100-3 | Superseded part |
| Tohatsu | 3G2-03100-4 | Superseded part |
| Tohatsu | 3G2-03100-5 | Superseded part |
| Sierra | 18-7848 | Aftermarket cross-reference |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
Tohatsu Engines: This carburetor fits specific 2-stroke models M9.9D2, M15D2, and M18E2.
Nissan Engines: This carburetor fits corresponding Nissan 2-stroke models NS9.9D2, NS15D2, and NS18E2.
| Brand | Model | Rated HP | Stroke | OEM Part No. | Notes |
|---|---|---|---|---|---|
| Tohatsu | M9.9D2 | 9.9 | 2-Stroke | 3G2-03100-0 | Also fits 3G2-03100-1/2/3/4/5 variants |
| Tohatsu | M15D2 | 15 | 2-Stroke | 3G2-03100-0 | Also fits 3G2-03100-1/2/3/4/5 variants |
| Tohatsu | M18E2 | 18 | 2-Stroke | 3G2-03100-0 | Also fits 3G2-03100-1/2/3/4/5 variants |
| Nissan | NS9.9D2 | 9.9 | 2-Stroke | 3G2-03100-0 | Also fits 3G2-03100-1/2/3/4/5 variants |
| Nissan | NS15D2 | 15 | 2-Stroke | 3G2-03100-0 | Also fits 3G2-03100-1/2/3/4/5 variants |
| Nissan | NS18E2 | 18 | 2-Stroke | 3G2-03100-0 | Also fits 3G2-03100-1/2/3/4/5 variants |
Technical Specs
- Product Type
- Carburetor Assembly
- Installation
- Direct OEM replacement
- Fuel Type
- Gasoline (petrol)
- Connection
- Direct mount with gasket
- Housing Material
- Aluminum alloy
- Housing Color
- Silver/metallic
- Fitting Type
- Factory mounting points with gasket seal
- Other Technical Attributes
- Includes all jets and passages as OEM
- Warranty
- 1 year against manufacturing defects (JLM Marine)
What’s in the Box
- 1 x Carburetor Assembly (Replaces 3G2-03100-0)
Installation Notes
- Ensure the engine is off and cool. Disconnect the negative battery terminal and turn off the fuel supply.
- Carefully disconnect the fuel line from the old carburetor.
- Remove the bolts securing the old carburetor to the engine manifold and detach any linkage cables.
- Thoroughly clean the manifold mounting surface to ensure a proper seal with the new gasket.
- Mount the new carburetor assembly, ensuring the gasket is correctly aligned.
- Tighten the mounting bolts evenly to the manufacturer's recommended torque. Do not overtighten.
- Reconnect the throttle and choke linkages, followed by the fuel line.
- Turn the fuel supply back on, reconnect the battery, and check for any fuel leaks before starting the engine.
- Start the engine and adjust the idle speed screw if necessary for smooth operation.
Troubleshooting & FAQ
How do I confirm this carburetor fits my engine?
Verify your engine's brand, model, and horsepower against our "Engine & Model Compatibility" table. This part is a confirmed fit for Tohatsu models like M9.9D2, M15D2, M18E2 and Nissan models NS9.9D2, NS15D2, NS18E2 that use the 3G2-03100-X series part numbers.
Are adjustments needed after installation?
The carburetor is preset for most applications, but minor idle speed or air/fuel mixture adjustments may be required for optimal performance depending on your specific engine condition, altitude, and climate.
What are common signs of a bad carburetor?
Symptoms of a failing carburetor include difficulty starting, rough or erratic idling, stalling at low speeds, poor acceleration, black smoke from the exhaust, and a noticeable increase in fuel consumption.
What is the difference between this and an OEM part?
This is an aftermarket component manufactured to meet or exceed original equipment specifications for fit, form, and function. It delivers comparable performance and reliability at a more accessible price point.
How often should a marine carburetor be serviced or replaced?
Service intervals vary based on usage, fuel quality, and storage habits. Regular cleaning is recommended. Replacement is typically needed only when cleaning no longer resolves performance issues or if internal components are excessively worn.
Is a new gasket included?
This part is intended to be installed with a new gasket to ensure a proper air-tight seal. Please check "What's in the Box" or purchase a suitable gasket separately.
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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