Exhaust Pipe Gasket – Fits Yamaha 2HP 2-Stroke Outboards (Replaces 646-14623-A1-00)
Exhaust Pipe Gasket – Fits Yamaha 2HP 2-Stroke Outboards (Replaces 646-14623-A1-00) is backordered and will ship as soon as it is back in stock.
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Delivery and Shipping
Free standard shipping on all orders under 1 KG
Exhaust Pipe Gasket – Fits Yamaha 2HP 2-Stroke Outboards (Replaces ...
Product Details
This aftermarket Exhaust Pipe Gasket is designed for Yamaha 2HP 2-stroke portable outboard models manufactured between 1984–1993. It creates a reliable seal between components of the exhaust pipe assembly, preventing leaks and ensuring efficient engine operation.
It is a direct replacement for Yamaha OEM part numbers 646-14623-00-00, 646-14623-01-00, and 646-14623-A1-00.
- Installs between exhaust pipe components.
- Made from durable, OEM-grade gasket material to withstand heat and pressure.
- Engineered for a precise fit in compatible Yamaha portable outboards.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number | Superseded By | Notes |
|---|---|---|---|
| Yamaha | 646-14623-00-00 | 646-14623-01-00 | Original part number. |
| Yamaha | 646-14623-01-00 | 646-14623-A1-00 | Superseded part number. |
| Yamaha | 646-14623-A1-00 | Current primary part number. |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
For Yamaha owners: Ensure your engine model, horsepower, and year range match the listings below. Pay close attention to the model codes in parentheses (e.g., 6A1).
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Yamaha | 2B (6A1) | 2 | 2-Stroke | 1984–1993 | 646-14623-A1-00 | Supersedes 646-14623-01-00 |
| Yamaha | 2M (6A1) | 2 | 2-Stroke | 1991 | 646-14623-A1-00 | |
| Yamaha | 2MSH (6A10) | 2 | 2-Stroke | 1988–1990 | 646-14623-A1-00 | |
| Yamaha | 2SN | 2 | 2-Stroke | 1984 | 646-14623-A1-00 | |
| Yamaha | 2SK | 2 | 2-Stroke | 1985 | 646-14623-A1-00 | |
| Yamaha | 2SJ | 2 | 2-Stroke | 1986 | 646-14623-A1-00 | |
| Yamaha | 2SH | 2 | 2-Stroke | 1987 | 646-14623-A1-00 | |
| Yamaha | 2SG | 2 | 2-Stroke | 1988 | 646-14623-A1-00 | |
| Yamaha | 2SF | 2 | 2-Stroke | 1989 | 646-14623-A1-00 | |
| Yamaha | 2SD | 2 | 2-Stroke | 1990 | 646-14623-A1-00 | |
| Yamaha | 2MSHP | 2 | 2-Stroke | 1991 | 646-14623-A1-00 |
Technical Specs
- Product Type
- Exhaust Pipe Gasket
- Installation
- Between exhaust pipe components
- Material
- OEM-grade gasket material
- Dimensions
- 12.0 × 15.5 × 0.31 cm (4.72 × 6.10 × 0.12 in)
- Weight
- 0.02 kg (0.04 lbs)
- Warranty
- Manufacturer standard warranty
What’s in the Box
- 1 × Gasket, Exhaust Pipe (646-14623-A1-00)
Installation Notes
- Ensure the engine is off and cool, and disconnect the spark plug lead for safety.
- Access the exhaust pipe assembly where the old gasket is located.
- Carefully remove any fasteners securing the exhaust pipe connection.
- Remove the old, damaged gasket. Thoroughly clean both mating surfaces to remove any carbon buildup, rust, or old gasket residue. A clean surface is critical for a good seal.
- Position the new gasket, ensuring it aligns perfectly with the ports and bolt holes.
- Reassemble the components and tighten the fasteners to the manufacturer's recommended torque specifications, typically in a crisscross pattern to ensure even pressure.
- After reassembly, start the engine and check for any signs of exhaust leaks (e.g., unusual noise or visible fumes) around the new gasket.
Troubleshooting & FAQ
How do I know if this gasket fits my Yamaha outboard?
The most reliable method is to check your engine's model name, year, and serial/model code against our compatibility table. This gasket is specifically for 2HP, 2-stroke Yamaha models listed, such as the 2B (6A1) from 1984–1993. Do not rely on appearance alone.
What are the signs of a failing exhaust pipe gasket?
Common symptoms include a louder-than-usual exhaust noise (especially a ticking or popping sound from the engine), a noticeable loss of engine power, reduced fuel efficiency, or visible soot/black streaks around the exhaust pipe joint.
Can I reuse my old gasket?
No. Gaskets are designed for a single use. They compress and deform to create a seal. Once removed, they will not provide a reliable seal again and should always be replaced with a new one whenever the components are disassembled.
Is there a recommended replacement interval?
There is no specific service interval in hours. Gaskets should be replaced whenever the components they seal are taken apart for service, or immediately if any signs of a leak are detected.
What happens if I ignore a leaky gasket?
A minor leak can lead to reduced engine performance and efficiency. A major leak can release hot exhaust gases into the engine cowling, potentially damaging other components, and can also affect the engine's air-fuel mixture, leading to poor running conditions.
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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