Ball Bearing (30x72x19mm) – Fits Yamaha Outboard Motors 9.9HP to 100HP (Replaces 93306-306V6)
Ball Bearing (30x72x19mm) – Fits Yamaha Outboard Motors 9.9HP to 100HP (Replaces 93306-306V6) is backordered and will ship as soon as it is back in stock.
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Delivery and Shipping
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Ball Bearing (30x72x19mm) – Fits Yamaha Outboard Motors 9.9HP to 10...
Product Details
This high-precision Ball Bearing (30x72x19mm) is engineered for Yamaha Outboard Motors ranging from 9.9HP to 100HP, covering various 2-stroke and 4-stroke models. It serves as a critical internal component for the crankshaft, ensuring smooth, high-speed operation.
It directly replaces Yamaha part numbers 93306-306V6-00, 93306-306V5, 93306-306V1, 93306-306V2, and 93306-306U2.
- Installation: Mounts internally on the engine crankshaft.
- Performance: Designed for long life and high-speed applications.
- Construction: Made from durable Chrome Steel (GCr15) or Stainless Steel.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number | Notes |
|---|---|---|
| Yamaha | 93306-306V6-00 | Primary reference number. |
| Yamaha | 93306-306V6 | Base OEM part number. |
| Yamaha | 93306-306V5 | Interchangeable previous version. |
| Yamaha | 93306-306V2 | Interchangeable previous version. |
| Yamaha | 93306-306V1 | Interchangeable previous version. |
| Yamaha | 93306-306U2 | Interchangeable previous version. |
| KOYO | 6306 | Known technical equivalent. |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
This bearing is used across a wide range of Yamaha outboard motors. While specific model years are not listed, the part is confirmed to fit the HP ratings and series shown.
| Brand | Model | Rated HP | Stroke | Notes |
|---|---|---|---|---|
| Yamaha | Various | 9.9 | 2-Stroke | |
| Yamaha | Various | 15 | 2-Stroke | |
| Yamaha | Various | 20 | 2-Stroke | |
| Yamaha | Various | 25 | 2-Stroke | |
| Yamaha | Various | 30 | 2-Stroke | |
| Yamaha | 40X(E) | 40 | 2-Stroke | Primary application |
| Yamaha | Various | 48 | 2-Stroke | |
| Yamaha | Various | 60 | 2-Stroke | |
| Yamaha | Various | 70 | 2-Stroke | |
| Yamaha | Various | 80 | 2-Stroke | |
| Yamaha | Various | 100 | 2-Stroke |
Technical Specs
- Product Type
- Ball Bearing
- Installation
- Internal (Crankshaft)
- Dimensions
- 30mm (inner) x 72mm (outer) x 19mm (height)
- Bearing Type
- Single Row Deep Groove Ball Bearing
- Material
- Chrome Steel (GCr15) / Stainless Steel
- Application
- Outboard Motor
- Precision Rating
- P6
- Cage Material
- Steel
- Housing Color
- Silver/Metallic
- Weight
- 0.6 kg (1.32 lbs)
- Features
- Long Life, High Speed
- OEM Number
- 93306-306V6
- Other Technical Attributes
- KOYO 6306 Equivalent
What’s in the Box
- 1 x Ball Bearing (Replaces 93306-306V6-00)
Installation Notes
- Always consult your engine’s official service manual before beginning work.
- Disconnect the battery and take necessary precautions to prevent accidental starting.
- Access the engine's crankshaft assembly according to manufacturer procedures. This is a complex task and may require specialized engine disassembly.
- Use a suitable bearing puller and press to remove the old bearing and install the new one. Do not use a hammer or apply impact force, as this can damage the bearing and crankshaft.
- Ensure the bearing is seated correctly and moves freely without binding.
- Reassemble all components in reverse order of disassembly, torquing bolts to the manufacturer's specifications.
- After reassembly, test the engine at low RPM to ensure proper function before returning to normal operation.
Troubleshooting & FAQ
How do I know if this bearing is the correct one for my engine?
This bearing replaces Yamaha part number 93306-306V6 and its variants. The best way to confirm fitment is to check your engine's service manual or existing part for this number. While it fits many models from 9.9HP to 100HP, always verify with your specific model and serial number.
What are the signs of a failing crankshaft bearing?
Common symptoms include a rumbling, grinding, or knocking noise from the engine, excessive vibration, or increased engine temperature. In severe cases, it can lead to catastrophic engine failure.
Is this a direct crossover for a KOYO 6306 bearing?
Yes, this bearing is a technical equivalent to a standard KOYO 6306 deep groove ball bearing, matching its dimensions and performance characteristics.
When should this bearing be replaced?
Replacement interval depends on usage, maintenance, and operating conditions. There is no fixed schedule; it should be replaced when signs of wear or failure, like noise or vibration, become apparent during service inspections.
What is the difference between the Chrome Steel and Stainless Steel versions?
Both materials offer excellent durability. Chrome Steel (GCr15) is the industry standard for high load and high precision. Stainless steel provides superior corrosion resistance, making it an ideal choice for saltwater environments, though it may have slightly different load ratings.
Can I install this bearing myself?
This is an advanced repair. Due to the need for specialized tools (like a bearing press/puller) and the complexity of engine disassembly, professional installation by a qualified marine mechanic is highly recommended.
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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