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
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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 aftermarket carburetor assembly for selected Yamaha 40HP 2-stroke outboard applications. It is designed to provide reliable fuel delivery and is listed for Yamaha 40HP 2-stroke models, including selected 40X, 40XW, 40XMH, E40X, T40, and related variants. Always compare your engine model, year, original carburetor, and mounting details before ordering.
This assembly is listed as a replacement for Yamaha part numbers 66T-14301-00, 66T-14301-01, 66T-14301-02, and 66T-14301-03. It is also associated with aftermarket references Sierra 18-34605 and Mallory 9-34605. These references are provided for identification and comparison; confirm the exact application before installation.
- Designed as a direct replacement for listed applications.
- Durable alloy housing suitable for normal marine use.
- Aftermarket replacement component, not an original Yamaha-manufactured part.
Part Number Matrix
Use this matrix to compare the replacement references associated with this carburetor assembly.
| Brand | Part Number | Notes |
|---|---|---|
| Yamaha | 66T-14301-00 | Earlier reference |
| Yamaha | 66T-14301-01 | Earlier reference |
| Yamaha | 66T-14301-02 | Replacement reference |
| Yamaha | 66T-14301-03 | Replacement reference |
| Sierra | 18-34605 | Aftermarket cross-reference |
| Mallory | 9-34605 | Aftermarket cross-reference |
Engine & Model Compatibility
The applications below are listed for this carburetor assembly. Match the complete engine model designation, year, stroke, and original part number before purchase. Model and year combinations can vary by market and configuration.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Yamaha | 40X, 40XW | 40 | 2-Stroke | 1998–2000 | 66T-14301-02 | Verify model designation before ordering. |
| Yamaha | 40XMH | 40 | 2-Stroke | 2003–2005 | 66T-14301-02 | Verify model designation before ordering. |
| Yamaha | 40XMH, XMHS, XMHL | 40 | 2-Stroke | 2009–2012 | 66T-14301-02 | Verify model designation before ordering. |
| Yamaha | E40X, MLH | 40 | 2-Stroke | 1998–2000 | 66T-14301-02 | Verify model designation before ordering. |
| Yamaha | E40X, XMH, XMHS, XMHL, MLHZ | 40 | 2-Stroke | 2001–2005 | 66T-14301-02 | Verify model designation before ordering. |
| Yamaha | E40X, XMHS, XMHL, XMHX | 40 | 2-Stroke | 2006–2012 | 66T-14301-02 | Verify model designation before ordering. |
| Yamaha | T30 | 30 | 2-Stroke | Not specified | 66T-14301-02 | Enduro Series; confirm the original carburetor reference. |
| Yamaha | T40 | 40 | 2-Stroke | Not specified | 66T-14301-02 | Enduro Series; confirm the original carburetor reference. |
| Parsun | Not specified | 40 | 2-Stroke | Not specified | Not specified | Confirm model, year, and original part before ordering. |
Technical Specs
- Product Type
- Carburetor assembly
- Application
- Selected Yamaha 40HP 2-stroke outboard applications
- Installation
- Direct replacement for compatible applications
- Fuel Type
- Gasoline
- Housing Material
- Alloy
- Housing Color
- Silver/metallic
- Product Status
- Aftermarket replacement; not an OEM Yamaha part
What’s in the Box
- 1 x Carburetor assembly
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 and debris.
- Install a new gasket if one is required for your engine and is not included or integrated with the assembly.
- Mount the replacement carburetor and tighten the fasteners evenly to the engine manufacturer’s specified torque.
- Reconnect the fuel lines, throttle linkage, and all other connections removed during disassembly.
- Turn the fuel supply back on and inspect all connections for leaks.
- Reconnect the battery and prime the fuel system if necessary.
- Start the engine and allow it to warm up. Check for smooth idling, throttle response, and fuel leaks. Any required adjustment should follow the engine manufacturer’s service procedure.
Troubleshooting & FAQ
How do I confirm this carburetor fits my specific engine?
Match the complete engine model and year to the compatibility table, then compare the part number and mounting arrangement of your original carburetor with the listed references. Model names alone may not identify every configuration, so compare the original part and product photos before ordering.
What are the signs of a failing outboard carburetor?
Common symptoms include difficult starting, rough idling, stalling at low speeds, poor acceleration, increased fuel consumption, or fuel leaking from the carburetor. These symptoms can also result from fuel-system, ignition, or adjustment problems, so diagnose the engine before replacing parts.
Will I need to tune or adjust this carburetor after installation?
The replacement is intended for compatible applications, but idle speed, mixture, linkage, and other adjustments may need to be checked after installation. Follow the service procedure for your specific engine and do not change sealed or calibrated settings without the proper specifications.
How often should a carburetor be serviced or replaced?
Service intervals depend on fuel quality, use, and storage conditions. Inspect and service the fuel system according to the engine manufacturer’s maintenance schedule. Replacement is generally considered when cleaning and replacing serviceable components do not resolve the problem or when the carburetor body is damaged or excessively worn.
Is this an OEM part?
No. This listing is for an aftermarket replacement carburetor assembly intended for the applications and reference numbers shown above. Yamaha is a trademark of its respective owner and is used only to identify compatibility.
Shipping speed and cost
Available shipping methods, delivery estimates, and costs are shown at checkout and may vary by destination.
Warranty and returns
Warranty coverage and return eligibility are subject to the seller’s current policy. Contact support with your order details if you need assistance.
Safety & Important Information
- Verify the engine model, year, stroke, original part number, and physical configuration before ordering.
- Do not install the assembly if the mounting pattern, linkage, fuel connections, or other details differ from the original part.
- This is an aftermarket replacement component, not an original equipment manufacturer part.
- Fuel-system work should be performed in a well-ventilated area away from flames and ignition sources.
- Professional installation is recommended when you are not familiar with outboard fuel-system service.
About Sea Sierra
- Pro-Grade Standards — We supply marine replacement parts selected for practical fitment and dependable service.
- Global Fulfillment — Shipping options and delivery estimates are provided at checkout based on destination.
- Manufacturer-Direct Value — We work with suppliers to provide replacement components at competitive prices.
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