90430-08003 Yamaha Gearbox Drain Gasket | Genuine OEM Yamaha Outboard Part
90430-08003 Yamaha Gearbox Drain Gasket | Genuine OEM Yamaha Outboard Part
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🔧 Product Description
Genuine Yamaha Gearcase Drain and Vent Screw Gasket - Part Number: 90430-08003
A genuine Yamaha fibre sealing washer for lower-unit gear-oil drain, fill and vent screws.
The gasket seals beneath the screw head and should normally be replaced whenever the plug is removed to prevent lubricant loss or water entry.
⚙️ Key Features
- Genuine Yamaha OEM gearcase screw gasket
- Correct current Yamaha part number 90430-08003
- Supersedes earlier washer 90430-08020
- Used on Yamaha lower-unit drain and vent screws
- Two washers commonly required during a gear-oil change
🚤 Compatibility
Commonly used on
- Yamaha outboard lower-unit drain and vent screws
- Gearcase lubricant servicing
Typically suits
- Engine models:
- Yamaha portable outboards
- Yamaha mid-range outboards
- Yamaha V6 and V8 high-horsepower outboards
- Yamaha two-stroke, HPDI, four-stroke, VMAX SHO and XTO gearcases using the matching drain screw
- Conventional and counter-rotation Yamaha lower units
- HP Range: Applicable Yamaha outboards from small portable engines through high-horsepower models
- System Type: Lower-unit lubricant drain, fill and vent screw
- Service Quantity: Commonly two gaskets per gear-oil change.
🔌 Function
The gasket forms a fluid-tight seal beneath the drain or vent screw, retaining gear lubricant and preventing water intrusion.
⚠️ Common Signs of Failure
- Gear oil around the screw
- Milky or water-contaminated lubricant
- Washer is flattened, cracked or missing
- Gearcase fails pressure testing at the plug
- Leakage begins after an oil change
🔄 Supersession & Cross Reference
OEM Supersession Chain
- 90430-08003 → Supersedes 90430-08020
- 90430-08020 earlier OEM gearcase gasket reference
OEM / Related Numbers
- 90430-08003
- 90430-08003-00
- 90430-08020
- Yamaha gear-oil drain-plug washer
- Yamaha vent-plug sealing gasket
Aftermarket / Verified Equivalents
- Aftermarket Yamaha-pattern black fibre drain-plug washer
- Replacement gasket supplied in Yamaha-pattern gear-oil service kits
📦 Condition
- Genuine Yamaha part
- Brand new
- Supplied in original or equivalent packaging
Shipping & Delivery
Shipping & Delivery
Flat-rate shipping Australia-wide — $14.99 per order, no matter how many parts you add. Orders dispatch from our Kadina, South Australia store. Need it urgently or want to collect in person? Call us on 0412 532 984 before ordering.
Returns & Warranty
Returns & Warranty
14-day change-of-mind returns — if it's not right or you ordered the wrong part, send it back within 14 days in new, unused condition for a refund or exchange. Manufacturer warranties apply to new parts. Full details in our Refunds & Returns policy.
Not sure this fits?
Not sure this fits?
Ask us before you buy — we check part numbers and fitment every day. Call 0412 532 984 (Mon–Fri 8.30am–4.30pm) or message us through the contact page with your engine or vehicle details.
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