Carburetor Assembly – Fits Yamaha 40HP 2-Stroke (Replaces 66T-14301-02, 66T-14301-03)
Carburetor Assembly – Fits Yamaha 40HP 2-Stroke (Replaces 66T-14301-02, 66T-14301-03) is backordered and will ship as soon as it is back in stock.
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Delivery and Shipping
Delivery and Shipping
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Carburetor Assembly – Fits Yamaha 40HP 2-Stroke (Replaces 66T-14301...
Carburetor Assembly – Fits Yamaha 40HP 2-Stroke (Replaces 66T-14301-02, 66T-14301-03) is backordered and will ship as soon as it is back in stock.
Product Details
This is a complete Carburetor Assembly – Fits Yamaha 40HP 2-Stroke Outboards (Replaces 66T-14301-02, 66T-14301-03), designed for a wide range of Yamaha 40HP 2-stroke outboard motors manufactured between 1998 and 2012. It is engineered to fit models including the Enduro T30/T40 series, E40X, E40XMH, and related variants, ensuring reliable fuel delivery and engine performance.
This assembly provides a direct interchange for Yamaha part numbers 66T-14301-00, 66T-14301-01, 66T-14301-02, and 66T-14301-03, as well as aftermarket equivalents Sierra 18-34605 and Mallory 9-34605.
- Designed for direct, bolt-on installation with no modifications required.
- Constructed from a durable alloy housing to withstand the marine environment.
- Produced in an ISO9002 certified facility for consistent quality and performance.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket brands.
| Brand | Part Number | Notes |
|---|---|---|
| Yamaha | 66T-14301-00 | Superseded by subsequent versions |
| Yamaha | 66T-14301-01 | Superseded by subsequent versions |
| Yamaha | 66T-14301-02 | Primary replacement |
| Yamaha | 66T-14301-03 | Primary replacement |
| Sierra | 18-34605 | Aftermarket cross-reference |
| Mallory | 9-34605 | Aftermarket cross-reference |
Engine & Model Compatibility
Confirm your engine model and year range in the tables below to ensure proper fitment.
This carburetor is confirmed to fit a variety of Yamaha 40HP 2-Stroke engines. Please match your specific model and year.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Yamaha | 40X, 40XW | 40 | 2-Stroke | 1998–2000 | 66T-14301-02 | |
| Yamaha | 40XMH | 40 | 2-Stroke | 2003–2005 | 66T-14301-02 | |
| Yamaha | 40XMH, XMHS, XMHL | 40 | 2-Stroke | 2009–2012 | 66T-14301-02 | |
| Yamaha | E40X, MLH | 40 | 2-Stroke | 1998–2000 | 66T-14301-02 | |
| Yamaha | E40X, XMH, XMHS, XMHL, MLHZ | 40 | 2-Stroke | 2001–2005 | 66T-14301-02 | |
| Yamaha | E40X, XMHS, XMHL, XMHX | 40 | 2-Stroke | 2006–2012 | 66T-14301-02 | |
| Yamaha | T30 | 30 | 2-Stroke | 66T-14301-02 | Enduro Series | |
| Yamaha | T40 | 40 | 2-Stroke | 66T-14301-02 | Enduro Series | |
| Parsun | 40 | 2-Stroke | Per JLM Marine |
Technical Specs
- Product Type
- Carburetor Assembly
- Installation
- Direct OEM replacement
- Fuel Type
- Gasoline
- Housing Material
- Alloy
- Housing Color
- Silver/Metallic
- Warranty
- Varies by seller (typically 1 year)
- Other Technical Attributes
- ISO9002 certified production (per JLM Marine)
What’s in the Box
- 1 x Carburetor Assembly (Replaces 66T-14301-02 / 66T-14301-03)
Installation Notes
- Disconnect the battery and shut off the fuel supply to the engine.
- Carefully disconnect the fuel lines, throttle linkage, and any choke or electrical connections from the old carburetor. Label them to ensure correct reassembly.
- Remove the nuts or bolts securing the carburetor to the intake manifold and carefully detach it.
- Clean the manifold mounting surface, ensuring it is free of old gasket material or debris.
- Place a new gasket (if not integrated) and mount the new carburetor assembly.
- Tighten the mounting nuts or bolts evenly to the manufacturer's specified torque.
- Reconnect the fuel lines, throttle linkage, and any other connections removed in step 2.
- Turn the fuel supply back on and check for any leaks.
- Reconnect the battery. Before starting, prime the fuel system if necessary.
- Start the engine and allow it to warm up. Check for smooth idling and throttle response. Minor idle speed or air/fuel mixture adjustments may be necessary.
Troubleshooting & FAQ
How do I confirm this carburetor fits my specific engine?
The best way is to match your engine's model and year to the compatibility table. Additionally, compare the part numbers stamped on your original carburetor with those listed in our Part Number Matrix. Visual comparison with our product photos is also highly recommended.
What are the signs of a failing outboard carburetor?
Common symptoms include difficulty starting, rough idling, stalling at low speeds, poor acceleration, increased fuel consumption, or fuel leaking from the carburetor body. These issues often arise from internal blockages, worn components, or improper float levels.
Will I need to tune or adjust this carburetor after installation?
This carburetor is designed to work out of the box for most listed applications. However, minor adjustments to the idle speed or air/fuel mixture screws may sometimes be needed to achieve optimal performance for your specific engine and operating conditions.
How often should a carburetor be serviced or replaced?
Service intervals depend heavily on fuel quality, usage, and storage habits. For preventative maintenance, cleaning the carburetor every 1-2 seasons is good practice. Replacement is typically only necessary when cleaning no longer resolves performance issues or when internal components are excessively worn.
OEM vs. Aftermarket?
This listing is an aftermarket replacement (not OEM). It has been built to OEM-level specifications with comparable materials. The unit is manufactured in an ISO 9002 facility and batch-inspected for consistency.
Shipping speed & cost
We ship worldwide quickly—typical transit is 5–15 days. Standard shipping is free; expedited options will appear at checkout where available.
Warranty & returns
This product is covered by a 1-year warranty against manufacturing defects under normal use. If any issues arise, please contact our support team with your order details. Returns are accepted within our standard window for items that are unused and in their original condition. See our policy page or reach out for instructions.
Safety & Important Info
- Verify images and specifications against your original part before ordering. If anything differs—even if your model appears on our compatibility list—do not purchase.
- This product is an aftermarket replacement component, not an original equipment manufacturer (OEM) part.
- Professional installation is highly recommended for safety, performance, and to prevent damage to your engine.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and rigorously tested for real-world reliability.
- Fast Global Fulfillment — We offer free standard delivery to most regions, with an average transit time of 5–15 days.
- Manufacturer-Direct Value — By working directly with manufacturers, we provide fair pricing without compromising on materials or quality control.
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