Gearbox Drain Fill Screw 90340-08002 & Washers for Yamaha Outboard 2hp-350hp
90340-08002A
- Dispatched in 2-3 days
- 30 Day Return Policy
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- Backordered, shipping soon
Gearbox Drain Screw & Washer Kit
Replaces Yamaha 90340-08002 | Complete Maintenance Set
Ensure your lower unit remains watertight and protected with this high-quality gearbox oil drain/fill screw kit. This set includes two precision-machined screws and two matching sealing washers, designed specifically for the rigorous demands of marine environments. Maintaining the integrity of your gearbox seals is essential to prevent water ingress, which can lead to expensive gear and bearing damage.
Key Features
- ✔ Full Kit: 2x Screws & 2x Sealing Washers
- ✔ Corrosion Proof: Stainless Steel Construction
- ✔ Universal Yamaha Fit: Standard M8 Sizing
- ✔ Easy Maintenance: Slotted head for standard tools
Technical Specs
| Thread Size: | M8 x 1.25 |
| Material: | Stainless Steel |
| Head Style: | Slotted Flat Head |
| Component Count: | 4 Pieces Total |
Compatibility / Fitment Guide
| Make/System | Model/Application | Notes |
|---|---|---|
| Yamaha Outboard | 2HP to 350HP (Most Models) | Lower unit drain/fill |
| Mercury Marine | 8HP / 9.9HP / 15HP / 25HP (Yamaha-based) | Fits Yamaha origins |
| Parsun / Hidea | F2.5, F4, F5, F15, F20 | Direct replacement |
| Selva Marine | All models using Yamaha internals | Fits gearcase casing |
OEM Cross Reference
| Yamaha OEM: | 90340-08002, 90340-08002-00, 90340-08M04 |
| Sierra Marine: | 18-2371 |
| Mercury/Quicksilver: | 22-81924M |
| Mallory Marine: | 9-72653 |
Questions & Answers
Is this a genuine original part?
This is a premium quality aftermarket replacement part from 4Boats, manufactured to meet or exceed original equipment (OE) standards for fitment and performance.
How do I know if it is compatible?
We recommend checking the SKU/MPN (90340-08002) against your engine's parts manual. This M8 thread size is the standard for nearly all Yamaha outboard lower units.
Why should I replace the washers with every oil change?
Sealing washers are designed to compress once to create a vacuum seal. Reusing old washers often leads to leaks, which can allow water to mix with your gear oil and destroy your transmission components.
Note: Please verify your original part number against the references above before purchasing. Distributed by 4Boats (4boats.co.uk).
For the products under £150 the shipping is £6.99.
Free delivery for most items over £150.
