Needle Valve Assembly – Fits Yamaha 2-Stroke Outboards (Replaces 6H3-14590-02-00, 6H3-14590-00-00)
Needle Valve Assembly – Fits Yamaha 2-Stroke Outboards (Replaces 6H3-14590-02-00, 6H3-14590-00-00) is backordered and will ship as soon as it is back in stock.
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Worry-free returns
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Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Needle Valve Assembly – Fits Yamaha 2-Stroke Outboards (Replaces 6H...
Product Details
This aftermarket Needle Valve Assembly is designed as a direct replacement for various Yamaha 2-stroke outboard engines ranging from 40 to 85 HP, manufactured between 1984 and 1999. It is a crucial component for regulating fuel flow within the carburetor assembly, ensuring reliable engine performance.
It serves as a direct interchange for Yamaha part numbers 6H3-14590-02-00 and the superseded 6H3-14590-00-00.
- Installs as a direct replacement component.
- Designed for 2-stroke gasoline marine engines.
- Essential part of the carburetor float bowl system.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number | Superseded By | Notes |
|---|---|---|---|
| Yamaha | 6H3-14590-00-00 | 6H3-14590-02-00 | |
| Yamaha | 6H3-14590-02-00 | Current Part Number |
Engine & Model Compatibility
Confirm your engine model and year in the table below.
This part is designed for a range of Yamaha 2-stroke outboards. Always verify your engine's specific part number before ordering.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Yamaha | Various 2-Stroke Models | 40–85 | 2-Stroke | 1984–1999 | 6H3-14590-02-00 | Supersedes 6H3-14590-00-00 |
Technical Specs
- Product Type
- Needle Valve Assembly
- Installation
- Direct replacement
- Fuel Type
- Gasoline (2-stroke)
- Connection
- OEM fit
- Dimensions
- 1.0" H x 9.5" W x 9.0" L
- Warranty
- Manufacturer standard warranty
- Other Technical Attributes
- Used in carburetor assembly
What’s in the Box
- 1 x Needle Valve Assembly (6H3-14590-02-00)
Installation Notes
- Ensure the engine is off and the fuel supply is shut off before beginning work.
- Carefully drain any remaining fuel from the carburetor float bowl into a safe container.
- Remove the carburetor float bowl to access the float and needle valve assembly.
- Remove the float hinge pin, lift the float, and remove the old needle valve.
- Install the new needle valve, ensuring it is seated correctly on the float tang.
- Reassemble the float, hinge pin, and float bowl. Do not overtighten screws.
- Restore the fuel supply and check for leaks before starting the engine.
Troubleshooting & FAQ
How do I know if this needle valve fits my specific Yamaha engine model?
The best way to confirm is by matching your engine's original part number to the ones listed in our Part Number Matrix (6H3-14590-02-00 or 6H3-14590-00-00). While this part fits many 40–85 HP models from 1984–1999, always verify with your service manual.
What are common signs of a failing needle valve?
A worn or stuck needle valve often causes fuel to overflow from the carburetor bowl, leading to fuel leaks. Other symptoms include a flooded engine that is hard to start, rough idling, stalling, and an overly rich fuel mixture (black smoke from exhaust).
Is any adjustment required after installing the new needle valve?
Typically, no adjustment is needed for the needle itself as it works with the float. However, you should check and adjust the float height according to your engine's service manual specifications to ensure the correct fuel level in the bowl.
How often should a carburetor needle valve be replaced?
There is no fixed replacement interval. It should be inspected during routine carburetor servicing and replaced if it shows signs of wear, deformation on the rubber tip, or if it is no longer sealing properly.
Can I replace just the needle without the seat?
This assembly includes the needle valve. It is always recommended to replace the needle and its corresponding seat (if applicable and available as a set) together to ensure a perfect seal. Mismatched components can lead to leaks.
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.
Payment & Security
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