Carburetor – Fits Tohatsu & Nissan 2.5HP & 3.5HP 2-Stroke (Replaces 3F0-03100-4, 3D5-03100)
Carburetor – Fits Tohatsu & Nissan 2.5HP & 3.5HP 2-Stroke (Replaces 3F0-03100-4, 3D5-03100) 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.).
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Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Carburetor – Fits Tohatsu & Nissan 2.5HP & 3.5HP 2-Stroke (...
Product Details
This is a direct-replacement Carburetor – Fits Tohatsu & Nissan 2.5HP & 3.5HP 2-Stroke (Replaces 3F0-03100-4, 3D5-03100), designed for various Tohatsu, Nissan, and Mercury outboard motors. It fits specific 2.5HP and 3.5HP 2-stroke Tohatsu/Nissan models from 2002–2005 and Mercury 2HP to 3.3HP engines based on serial number ranges.
It provides a direct interchange for Tohatsu part numbers 3F0-03100-4, 3F0-03100-3, 3F0-03100-2, 3F0-03100-1, 3F0-03100-0, 3D5-03100-5, 3D5-03100-4, 3D5-03100-3, 3D5-03100-2, and others.
- Engineered for direct, bolt-on installation.
- Built with marine-grade corrosion-resistant components.
- Package includes one complete carburetor assembly.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number | Notes |
|---|---|---|
| Tohatsu | 3F0-03100-4 | Replaces previous versions |
| Tohatsu | 3F0-03100-3 | Superseded by 3F0-03100-4 |
| Tohatsu | 3F0-03100-2 | Superseded by 3F0-03100-3 |
| Tohatsu | 3F0-03100-1 | Superseded by 3F0-03100-2 |
| Tohatsu | 3F0-03100-0 | Superseded by 3F0-03100-1 |
| Tohatsu | 3D5-03100-5 | Cross-reference |
| Tohatsu | 3D5-03100-4 | Cross-reference |
| Tohatsu | 3D5-03100-3 | Cross-reference |
| Tohatsu | 3D5-03100-2 | Cross-reference |
| Tohatsu | 3F0031003M | Cross-reference |
| Tohatsu | 3F0031002M | Cross-reference |
| Tohatsu | 3F0031001M | Cross-reference |
| Tohatsu | 3F0031000M | Cross-reference |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
Fitment for Tohatsu and Nissan models is based on engine model and year. Please check your details carefully.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. |
|---|---|---|---|---|---|
| Tohatsu | M3.5A2 | 3.5 | 2-Stroke | 2002 & Earlier | 3F0-03100-4 |
| Tohatsu | M3.5B2 | 3.5 | 2-Stroke | 2002 & Earlier | 3F0-03100-4 |
| Tohatsu | M3.5A2 | 3.5 | 2-Stroke | 2003 | 3F0-03100-4 |
| Tohatsu | M3.5B2 | 3.5 | 2-Stroke | 2003 | 3F0-03100-4 |
| Tohatsu | M3.5A2 | 3.5 | 2-Stroke | 2004 | 3F0-03100-4 |
| Tohatsu | M3.5B2 | 3.5 | 2-Stroke | 2004 | 3F0-03100-4 |
| Tohatsu | M3.5A2 | 3.5 | 2-Stroke | 2005 | 3F0-03100-4 |
| Tohatsu | M3.5B2 | 3.5 | 2-Stroke | 2005 | 3F0-03100-4 |
| Nissan | NS3.5B2 | 3.5 | 2-Stroke | 2002 & Earlier | 3F0-03100-4 |
| Nissan | NS3.5A2 | 3.5 | 2-Stroke | 2003 | 3F0-03100-4 |
| Nissan | NS3.5B2 | 3.5 | 2-Stroke | 2003 | 3F0-03100-4 |
| Nissan | NS3.5A2 | 3.5 | 2-Stroke | 2004 | 3F0-03100-4 |
| Nissan | NS3.5B2 | 3.5 | 2-Stroke | 2004 | 3F0-03100-4 |
| Nissan | NS3.5A2 | 3.5 | 2-Stroke | 2005 | 3F0-03100-4 |
| Nissan | NS3.5B2 | 3.5 | 2-Stroke | 2005 | 3F0-03100-4 |
Fitment for Mercury models is determined by serial number. Find your engine's serial number on the transom bracket or ID tag.
| Brand | Rated HP | Stroke | Notes |
|---|---|---|---|
| Mercury | 2.5 | 2-Stroke | Serial number: 017000+ |
| Mercury | 3 | 2-Stroke | Serial number: 0A855097 to 0G710612 |
| Mercury | 3.3 | 2-Stroke | Serial number: 0D901217+ |
Technical Specs
- Product Type
- Carburetor Assembly
- Installation
- Direct Replacement
- Fuel Type
- Gasoline
- Housing Material
- Zinc Alloy
- Other Technical Attributes
- Marine-grade corrosion resistant construction
What’s in the Box
- 1 x Carburetor Assembly (3F0-03100-4/3D5-03100)
Installation Notes
- Disconnect the battery and shut off the fuel supply.
- Carefully remove the engine cover and airbox assembly to access the carburetor.
- Note the position of and disconnect the fuel lines, throttle cable, and any choke linkages attached to the old carburetor.
- Unscrew the mounting bolts holding the carburetor to the intake manifold and remove it.
- Clean the gasket surfaces on the intake manifold, removing any old debris.
- Position the new carburetor with a fresh gasket and tighten the mounting bolts evenly to the manufacturer's recommended torque.
- Reconnect the throttle cable, choke linkages, and fuel lines to their original positions.
- Reinstall the airbox and engine cover.
- Turn on the fuel supply, check for any leaks, and then reconnect the battery.
- Start the engine and adjust idle speed if necessary.
Troubleshooting & FAQ
How do I confirm this carburetor fits my engine?
Check your engine's model, year, and serial number against the compatibility tables above. For Tohatsu/Nissan, model and year are key. For Mercury, the serial number is the most reliable indicator.
What are common signs of a failing carburetor?
Symptoms include difficulty starting, rough idling, stalling at low speeds, bogging down on acceleration, black smoke from the exhaust (running rich), or engine surging. Fuel leaks from the carburetor body are another definite sign it needs replacement.
Is there a difference in performance compared to the OEM part?
This aftermarket carburetor is designed to meet or exceed original equipment specifications. When installed correctly on a compatible engine, it should restore the original performance characteristics for fuel delivery and engine operation.
Do I need to adjust or "jet" this carburetor before installation?
This carburetor comes pre-adjusted from the factory for the specified engine applications. In most cases, no initial adjustment is needed beyond setting the idle speed after installation. It is not designed for re-jetting.
How often should a small outboard carburetor be replaced?
There is no fixed replacement interval. Carburetors are typically replaced only when they fail. Lifespan depends heavily on fuel quality, usage frequency, and proper off-season storage (e.g., draining the fuel bowl).
What causes a carburetor to fail?
The most common cause is clogging from stale fuel, particularly ethanol-blended gasoline, which can leave varnish and deposits in the tiny internal passages. Corrosion from water in the fuel and wear on moving parts can also lead to failure.
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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