Carburetor Needle and Seat Kit – Fits Lawn Boy D600 F Series (Replaces 396521, 678882, 681741, 929697)
Carburetor Needle and Seat Kit – Fits Lawn Boy D600 F Series (Replaces 396521, 678882, 681741, 929697) 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
Carburetor Needle and Seat Kit – Fits Lawn Boy D600 F Series (Repla...
Product Details
This Carburetor Needle and Seat Kit provides the essential components to restore proper fuel flow control in Lawn Boy D600 and F series engines equipped with Lawn-Boy manufactured carburetors. It is also a direct-fit replacement for select Johnson/Evinrude 2 and 3 cylinder outboard models that use the specified part numbers.
This kit serves as a direct replacement for Lawn Boy part numbers 301996, 396521, 678882, 681741, 92-9697, and 929697; BRP interchanges 396521, 378895, and 678882; Sierra cross-reference 18-7093; and PartMart equivalent 49-035.
- Installs directly into the carburetor float assembly.
- Restores the carburetor's ability to regulate fuel flow.
- Includes one needle and seat assembly for a complete repair.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Lawn Boy | 301996 / 396521 / 678882 / 681741 / 92-9697 / 929697 |
| BRP | 396521 / 378895 / 678882 |
| Sierra | 18-7093 |
| PartMart | 49-035 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
For Lawn Boy, this kit is designed for D-600 and F series engines that use Lawn-Boy manufactured carburetors.
For Johnson/Evinrude, this kit fits various 2 and 3 cylinder models as a carburetor float valve.
| Brand | Model | OEM Part No. | Notes |
|---|---|---|---|
| Lawn Boy | D-600 Series | 396521 | With Lawn-Boy manufactured carburetors |
| Lawn Boy | F Series | 396521 | With Lawn-Boy manufactured carburetors |
| Johnson/Evinrude | 2 & 3 Cylinder Models | 396521, 678882, 378895 | Carburetor float valve |
Technical Specs
- Product Type
- Carburetor Needle Valve Rebuild Kit
- Installation
- Direct replacement
- Fuel Type
- Gasoline
- Connection
- Carburetor float bowl
- Weight
- 0.01 lbs (4.5g)
- Fitting Type
- Needle and seat
- Other Technical Attributes
- Functions as fuel flow regulator in carburetor float assembly
What’s in the Box
- 1 x Carburetor Needle Valve Rebuild Kit (396521)
Installation Notes
- Safely disconnect the fuel line and drain any remaining fuel from the carburetor.
- Carefully remove the carburetor float bowl.
- Remove the float pin to release the float and the old needle valve.
- Unscrew and remove the old needle seat from the carburetor body.
- Install the new seat, ensuring it is properly threaded and snug. Do not overtighten.
- Place the new needle onto the float's tab.
- Position the float and needle assembly back into the carburetor and secure it with the float pin.
- Check that the float moves freely and does not bind.
- Re-install the float bowl, reconnect the fuel line, and check for leaks before starting the engine.
Troubleshooting & FAQ
How do I know if this kit fits my carburetor?
This kit is specifically for Lawn Boy D600 and F series engines with original Lawn-Boy carburetors, and certain Johnson/Evinrude outboards. The most reliable method is to match your old part's number to the ones listed in our Part Number Matrix.
What are the signs of a failing needle and seat?
Common symptoms include fuel leaking from the carburetor, an engine that floods easily, fuel in the crankcase oil, or difficulty starting. These occur when the needle no longer creates a proper seal with the seat, allowing excess fuel to enter the carburetor bowl.
Is this kit difficult to install?
Installation is straightforward for those with basic mechanical experience. It involves removing the carburetor float bowl to access the old parts. However, due to the precise nature of carburetor work, professional installation is recommended if you are unsure.
How often should the needle and seat be replaced?
There is no fixed replacement interval. It should be replaced when signs of wear or failure appear. The rubber tip on the needle can harden or deform over time, especially with modern ethanol-blended fuels, compromising its seal.
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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