Lower Unit Gasket Kit – Fits Yamaha Outboard 20-25HP (Replaces 6L2-W0001-C3-00)
Lower Unit Gasket Kit – Fits Yamaha Outboard 20-25HP (Replaces 6L2-W0001-C3-00) is backordered and will ship as soon as it is back in stock.
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Worry-free returns
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.).
You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).
If you need to return an item, simply login to your account, view the order using the "Complete Orders" link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.
Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Product Details
This Lower Unit Gasket Kit provides all the necessary components for servicing the gearcase on Yamaha 20-25HP, 2-Stroke outboard motors manufactured between 1988 and 2009. It ensures a reliable seal to protect internal gears and bearings from water intrusion.
It serves as a direct interchange for Yamaha part number 6L2-W0001-C3-00 and its predecessors, as well as aftermarket equivalents from GLM Marine and EMP.
- Direct replacement design for a straightforward installation.
- Includes all required gaskets, oil seals, and O-rings for a complete lower unit reseal.
- Engineered from high-quality materials to meet or exceed OEM specifications for durability.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number | Notes |
|---|---|---|
| Yamaha | 6L2-W0001-C3-00 | Current OEM part. Replaces 6L2-W0001-20-00, 6L2-W0001-21-00, 6L2-W0001-22-00, and 6L2-W0001-23-00. |
| GLM Marine | 87826 | Aftermarket equivalent |
| EMP | 26-00329 | Aftermarket equivalent |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
For Yamaha Outboards: This kit is designed for the specific 20HP and 25HP 2-stroke models listed. Please check your engine's model code and year to ensure a perfect match.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Yamaha | 20D (6L3) | 20 | 2-Stroke | 1990–1993 | 6L2-W0001-C3-00 | |
| Yamaha | 20DEO (6L3) | 20 | 2-Stroke | 1991–1992 | 6L2-W0001-C3-00 | |
| Yamaha | 20DEM (6L3) | 20 | 2-Stroke | 1993–1994 | 6L2-W0001-C3-00 | |
| Yamaha | 20DM (6L3) | 20 | 2-Stroke | 1988 | 6L2-W0001-C3-00 | |
| Yamaha | 25ELG/ESG/LG/SG | 25 | 2-Stroke | 1988 | 6L2-W0001-C3-00 | |
| Yamaha | 25ELF/ESF/LF/SF | 25 | 2-Stroke | 1989 | 6L2-W0001-C3-00 | |
| Yamaha | 25ELD/ESD/LD/SD | 25 | 2-Stroke | 1990 | 6L2-W0001-C3-00 | |
| Yamaha | 25ELHP/ELRP/ESHP/MLHP/MSHP | 25 | 2-Stroke | 1991 | 6L2-W0001-C3-00 | |
| Yamaha | 25ELHQ/ELRQ/ESHQ/MLHQ/MSHQ | 25 | 2-Stroke | 1992 | 6L2-W0001-C3-00 | |
| Yamaha | 25ELHR/ELRR/ESHR/MLHR/MSHR | 25 | 2-Stroke | 1993 | 6L2-W0001-C3-00 | |
| Yamaha | 25ELHS/ELRS/ESHS/MLHS/MSHS | 25 | 2-Stroke | 1994 | 6L2-W0001-C3-00 | |
| Yamaha | 25ELHT/ELRT/ESHT/MLHT/MSHT | 25 | 2-Stroke | 1995 | 6L2-W0001-C3-00 | |
| Yamaha | 25D (6L3) | 25 | 2-Stroke | 1989, 1995 | 6L2-W0001-C3-00 | |
| Yamaha | 25MLH (6L20) | 25 | 2-Stroke | 1989–1992, 1994 | 6L2-W0001-C3-00 | |
| Yamaha | 25M (6L20) | 25 | 2-Stroke | 1991 | 6L2-W0001-C3-00 | |
| Yamaha | 25N (6L2/6L20) | 25 | 2-Stroke | 1988–1995 | 6L2-W0001-C3-00 | |
| Yamaha | 25NM (6L2) | 25 | 2-Stroke | 1993–1995 | 6L2-W0001-C3-00 |
Technical Specs
- Product Type
- Lower Unit Gasket Kit
- Installation
- Direct replacement
- Kit Dimensions
- 7.5" L x 6.0" W x 0.5" H
- Material Quality
- High-quality aftermarket components built to meet OEM specifications
What’s in the Box
- 1 x Lower Casing Packing (6L2-45315-A0-00)
- 1 x Exhaust Manifold Gasket (6L2-41134-00-00)
- 1 x Water Seal Damper (6L2-44367-00-00)
- 1 x Oil Seal (93101-20048-00)
- 1 x Oil Seal (93101-20M07-00)
- 1 x O-Ring (93210-60MA3-00)
- 1 x O-Ring (93210-60M99-00)
- 1 x O-Ring (93210-45161-00)
- 1 x GASKET (90430-08020-00)
Installation Notes
- Always disconnect the battery and allow the engine to cool completely before starting work.
- Place a drain pan under the lower unit and remove the drain and vent plugs to empty the gear lube.
- Remove the bolts securing the lower unit to the engine's midsection and carefully lower it.
- Disassemble the gearcase as needed to access all seals and gaskets, noting the orientation of each part.
- Thoroughly clean all mating surfaces, removing any old gasket residue, sealant, or corrosion.
- Carefully install the new oil seals, ensuring they are seated correctly and not damaged.
- Install the new gaskets and O-rings from the kit onto the cleaned surfaces.
- Reassemble the lower unit and attach it back to the engine, torquing bolts to the manufacturer's specification.
- Refill the gearcase with fresh, recommended gear lube to the proper level before operating.
Troubleshooting & FAQ
How do I know if I need a new lower unit gasket kit?
Common signs include water in your gear lube (which gives it a milky appearance), oil leaking from the lower unit, or visible damage to existing seals during routine maintenance or water pump service.
Will this kit fit my specific engine model?
This kit fits a wide range of Yamaha 20-25HP 2-stroke outboards from 1988–2009. Please verify your exact engine model and year against the compatibility table provided on this page to ensure a correct fit.
What is the recommended replacement interval for these gaskets?
It is best practice to replace lower unit gaskets and seals whenever you are servicing the water pump or performing other major lower unit repairs. For preventative maintenance, consider replacement every 2-3 seasons, depending on usage and operating conditions.
Are any special tools required for installation?
While basic hand tools are sufficient for most of the job, a seal puller and a seal driver are highly recommended for proper removal and installation of the oil seals without damaging them or the housing.
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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