Yamaha Lower Unit Gasket Kit – Fits Yamaha 2HP Outboards (Replaces 6A1-W0001-23-00)
Yamaha Lower Unit Gasket Kit – Fits Yamaha 2HP Outboards (Replaces 6A1-W0001-23-00) is backordered and will ship as soon as it is back in stock.
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Delivery and Shipping
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Yamaha Lower Unit Gasket Kit – Fits Yamaha 2HP Outboards (Replaces ...
Product Details
This is a complete Yamaha Lower Unit Gasket Kit designed for Yamaha 2HP, 2-Stroke outboard motors manufactured between 1989 and 2002. It provides all the necessary seals and gaskets to service the lower unit gearcase, ensuring a reliable, leak-free seal after maintenance or repairs.
This kit is a direct replacement for Yamaha OEM part numbers 6A1-W0001-23-00 and 6GD-W0001-20-00, offering a precise, factory-level fit for straightforward installation.
- Installation: Designed for an OEM factory fit.
- Application: For Lower Unit/Gearcase assembly on specified gasoline engines.
- Warranty: Includes a 1-year manufacturer warranty against defects.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket suppliers.
| Brand | Part Number | Superseded By |
|---|---|---|
| Yamaha | 6A1-W0001-23-00 | 6GD-W0001-20-00 |
| Yamaha | 6GD-W0001-20-00 |
Engine & Model Compatibility
Confirm your engine model and year in the table below to ensure accurate fitment.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Yamaha | 2MSHY | 2 | 2-Stroke | 1989–2002 | 6A1-W0001-23-00 | Superseded by 6GD-W0001-20-00 |
| Yamaha | 2MSHP | 2 | 2-Stroke | 1991 | 6A1-W0001-23-00 | Superseded by 6GD-W0001-20-00 |
| Yamaha | 2MSHQ | 2 | 2-Stroke | 1992 | 6A1-W0001-23-00 | Superseded by 6GD-W0001-20-00 |
| Yamaha | 2MSHR | 2 | 2-Stroke | 1993 | 6A1-W0001-23-00 | Superseded by 6GD-W0001-20-00 |
| Yamaha | 2MSHS | 2 | 2-Stroke | 1994 | 6A1-W0001-23-00 | Superseded by 6GD-W0001-20-00 |
| Yamaha | 2MSHT | 2 | 2-Stroke | 1995 | 6A1-W0001-23-00 | Superseded by 6GD-W0001-20-00 |
| Yamaha | 2MSHW | 2 | 2-Stroke | 1998 | 6A1-W0001-23-00 | Superseded by 6GD-W0001-20-00 |
| Yamaha | 2SD | 2 | 2-Stroke | 1990 | 6A1-W0001-23-00 | Superseded by 6GD-W0001-20-00 |
Technical Specs
- Product Type
- Gearcase/Lower Unit Gasket Kit
- Installation
- OEM Factory Fit
- Fuel Type
- Gasoline
- Dimensions
- 5.13″ L × 4.0″ W × 0.5″ H
- Warranty
- 1 Year (OVERSEE aftermarket version)
- Other Technical Attributes
- For Lower Unit/Gearcase Assembly
What’s in the Box
- 1 × Lower Unit Gasket Kit (Replaces 6A1-W0001-23-00)
Installation Notes
- Disconnect the spark plug lead and battery for safety.
- Position a drain pan under the lower unit and remove the upper and lower gear oil drain screws to empty the oil.
- Remove the bolts securing the lower unit to the engine's upper casing.
- Carefully separate the lower unit from the upper assembly. You may need to disconnect a speedometer tube or shift linkage.
- Remove the old gaskets, O-rings, and seals from the mating surfaces. Clean all surfaces thoroughly, ensuring they are free of old material and corrosion.
- Install the new gaskets and seals from the kit onto the appropriate locations.
- Re-attach the lower unit to the engine, ensuring all linkages are properly connected. Tighten bolts to the manufacturer's specified torque.
- Install a new washer on the lower drain screw and refill the gearcase with the recommended marine gear lubricant until it flows out of the upper vent hole.
- Install the upper vent screw, followed by the lower drain screw. Clean any excess oil and check for leaks.
Troubleshooting & FAQ
How do I know if this gasket kit fits my Yamaha 2HP engine?
This kit is specifically for Yamaha 2HP 2-stroke models made from 1989 to 2002. The best way to confirm fitment is to check your engine's model number against the compatibility table provided on this page. For example, models like 2MSHY, 2MSHP, and 2SD are compatible.
What are common signs that my lower unit gaskets are failing?
The most common sign of a failed gearcase gasket is milky or creamy-looking gear oil, which indicates water intrusion. Other signs include visible oil leaks around the lower unit seams or a recurring loss of gear lubricant.
When should I replace my lower unit gaskets?
It is best practice to replace lower unit gaskets and seals whenever the gearcase is opened for service, such as during a water pump impeller replacement or other internal repairs. If no service is performed, inspect the gear oil annually for signs of water, and replace the seals if contamination is found.
Why is water in my gearcase a problem?
Water contamination displaces gear oil, leading to inadequate lubrication of the gears and bearings. This causes rapid wear, corrosion, and can result in catastrophic gearcase failure if left unaddressed.
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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