Drain Plug Screw with Gasket – Fits Yamaha and Parsun 20HP–250HP
Drain Plug Screw with Gasket – Fits Yamaha and Parsun 20HP–250HP is backordered and will ship as soon as it is back in stock.
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Drain Plug Screw with Gasket – Fits Yamaha and Parsun 20HP–250HP
Drain Plug Screw with Gasket – Fits Yamaha and Parsun 20HP–250HP is backordered and will ship as soon as it is back in stock.
Product Details
This aftermarket Drain Plug Screw with Gasket is intended for Yamaha and Parsun outboard applications from 20HP to 250HP where the listed reference numbers are specified. It is supplied as one drain plug screw with a matching gasket for lower-unit oil service.
The drain plug is associated with Yamaha OEM reference numbers 688-45341-00 and 688-45341-10. The included gasket is identified by Yamaha reference 90430-08020. Always confirm the number on your original part and the applicable parts diagram before ordering.
- Drain plug screw for lower-unit service
- One matching gasket included
- Listed for Yamaha and Parsun outboards from 20HP to 250HP
- Aftermarket replacement for maintenance and service applications
Part Number Matrix
Use the following references to compare the plug and gasket with your original parts.
| Brand | Part Number | Component |
|---|---|---|
| Yamaha | 688-45341-00 | Drain plug screw |
| Yamaha | 688-45341-10 | Drain plug screw |
| Yamaha | 90430-08020 | Gasket supplied with the plug |
| Sierra Marine | 18-2374 | Aftermarket reference for the drain plug application |
| Mercury/Mariner | 95632M | Separate cross-reference listed for a comparable drain plug application; verify independently |
Engine & Model Compatibility
The company fitment information lists this drain plug screw with gasket for Yamaha and Parsun outboards rated from 20HP to 250HP. Horsepower alone does not confirm fitment, so match the applicable part number and lower-unit diagram before purchase.
| Brand | Rated HP | Fitment guidance |
|---|---|---|
| Yamaha | 20HP–250HP | Verify the original plug and gasket references before ordering. |
| Parsun | 20HP–250HP | Confirm the matching lower-unit parts diagram and thread specification. |
Technical Specs
- Product Type
- Drain plug screw with gasket
- Primary Application
- Lower-unit oil drain and service
- Listed Compatibility
- Yamaha and Parsun outboards, 20HP–250HP
- Drain Plug References
- 688-45341-00 and 688-45341-10
- Gasket Reference
- 90430-08020
- Product Construction
- Aftermarket replacement component
What's in the Box
- 1 × Drain plug screw
- 1 × Matching gasket
Installation Notes
- Position the outboard securely and follow the service manual procedure for lower-unit oil service.
- Remove the existing drain plug and allow the lower unit to drain as required.
- Inspect the plug threads and the threaded opening for damage, corrosion, or contamination.
- Clean the sealing surface before installation.
- Install the supplied gasket with the drain plug. Do not reuse a crushed or damaged gasket.
- Start the plug by hand to prevent cross-threading.
- Tighten to the torque specification in the applicable engine service manual. Do not overtighten.
- Refill the lower unit with the correct gear oil and quantity specified by the manufacturer.
- Check the plug area for leaks after servicing and before returning the engine to regular operation.
Troubleshooting & FAQ
How do I confirm that this drain plug fits my outboard?
Compare your original part with the listed references 688-45341-00, 688-45341-10, and gasket reference 90430-08020 in your engine parts diagram or service manual. Do not rely on horsepower alone.
Is this a two-plug kit?
No. This product is one drain plug screw supplied with one matching gasket. It does not include a second plug or a separate fill plug.
Can I reuse the old gasket?
It is recommended to install the supplied new gasket during service. Reusing a compressed or damaged gasket can lead to seepage or leaks.
What torque setting should I use?
Use the torque specification in the service manual for your specific engine and lower-unit assembly. The correct torque can vary by model and application.
How often should the drain plug gasket be replaced?
Inspect the plug and sealing surface during each lower-unit oil service and replace the gasket whenever the plug is removed or the gasket shows compression, damage, or wear.
What are signs that the drain plug needs attention?
Oil seepage, damaged threads, corrosion, a rounded drive surface, or a gasket that no longer seals properly are reasons to replace or inspect the drain plug assembly.
Safety & Important Info
- Verify the part number, thread engagement, sealing surface, and appearance against your original part before purchase.
- Compatibility is application-specific; Yamaha and Parsun horsepower ranges are provided as a guide and do not replace parts-diagram verification.
- This is an aftermarket replacement, not an OEM component.
- Use the correct gear oil and follow the engine manufacturer's service instructions.
- Professional installation is recommended if threads, sealing surfaces, or the lower-unit housing are damaged.
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