Ball Bearing – Fits Yamaha Outboard 20-30 HP (Replaces 93306-30510-00)
Ball Bearing – Fits Yamaha Outboard 20-30 HP (Replaces 93306-30510-00) is backordered and will ship as soon as it is back in stock.
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Worry-free returns
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Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Ball Bearing – Fits Yamaha Outboard 20-30 HP (Replaces 93306-30510-00)
Product Details
This replacement Ball Bearing is designed for internal crankshaft installation on Yamaha 20-30 HP, 2-Stroke outboard motors manufactured between 1986–2012. Engineered from high-grade GCr15 Chrome Steel, it ensures reliable performance and durability within the engine's core rotating assembly.
It serves as a direct interchange for Yamaha OEM part numbers 93306-30510-00, 93306-30550-00, 93306-30571-00, and 933-06305-71-00.
- For internal crankshaft installation.
- Constructed from durable GCr15 Chrome Steel with a copper-plated retainer.
- Includes the necessary pin for a complete fit.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Yamaha | 93306-30510-00 |
| Yamaha | 93306-30550-00 |
| Yamaha | 93306-30571-00 |
| Yamaha | 933-06305-71-00 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
This part is compatible with select Yamaha 2-stroke outboards from 20 to 30 HP.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Yamaha | 20ML Series | 20 | 2-Stroke | 1986–2012 | 93306-30510-00 | |
| Yamaha | 20MS Series | 20 | 2-Stroke | 1986–2012 | 93306-30510-00 | |
| Yamaha | 25EL Series | 25 | 2-Stroke | 1986–2012 | 93306-30510-00 | |
| Yamaha | 25ES Series | 25 | 2-Stroke | 1986–2012 | 93306-30510-00 | |
| Yamaha | 25ML Series | 25 | 2-Stroke | 1986–2012 | 93306-30510-00 | |
| Yamaha | 25MS Series | 25 | 2-Stroke | 1986–2012 | 93306-30510-00 | |
| Yamaha | 30EL Series | 30 | 2-Stroke | 1986–2012 | 93306-30510-00 | |
| Yamaha | 30ES Series | 30 | 2-Stroke | 1986–2012 | 93306-30510-00 | |
| Yamaha | 30L Series | 30 | 2-Stroke | 1986–2012 | 93306-30510-00 | |
| Yamaha | 30ML Series | 30 | 2-Stroke | 1986–2012 | 93306-30510-00 |
Technical Specs
- Product Type
- Ball Bearing
- Installation
- Internal, Crankshaft
- Housing Material
- Chrome Steel (GCr15)
- Dimensions
- 25 x 62 x 17 mm (Inner x Outer x Width)
- Retainer
- Copper Plating
- Precision Rating
- P6
- Other Technical Attributes
- Includes Pin
What’s in the Box
- 1 x Ball Bearing with Pin (Replaces 93306-30510-00)
Installation Notes
- Disconnect the battery and ensure the engine has completely cooled before beginning work.
- Disassemble the powerhead and other components as required to gain access to the crankshaft.
- Using a bearing puller, carefully remove the old bearing from the crankshaft, taking note of its orientation.
- Thoroughly clean the crankshaft journal and bearing seat, removing any old lubricant or debris.
- Gently press the new bearing onto the crankshaft using a bearing press or appropriate driver tool until it is fully and evenly seated.
- Reassemble the engine components in the reverse order of disassembly, ensuring all fasteners are torqued to the manufacturer's specified values.
Troubleshooting & FAQ
How do I know if this is the right bearing for my outboard?
Confirm your engine model, horsepower, and year range against the compatibility table. This bearing is a direct replacement for Yamaha OEM parts 93306-30510-00, 93306-30550-00, and 93306-30571-00 on specific 20-30 HP 2-Stroke models from 1986–2012.
What are the signs of a failing crankshaft bearing?
Common symptoms include a noticeable grinding or roaring noise from the engine casing, excessive engine vibration, or detectable side-to-side play in the crankshaft.
Do I need special tools for installation?
Yes, replacing an internal crankshaft bearing requires specialized tools, such as a bearing press and/or puller set, to ensure the bearing and crankshaft are not damaged during removal and installation.
Should the bearing be lubricated before installation?
It is recommended to apply a light coat of fresh engine oil to the bearing surfaces and crankshaft journal during installation to ensure smooth initial operation and prevent premature wear.
How does this bearing compare to the original OEM part?
This aftermarket bearing is manufactured to meet or exceed OEM specifications for material (GCr15 Chrome Steel), precision (P6), and dimensions (25x62x17mm), providing a reliable and cost-effective alternative.
What is the recommended replacement interval for this bearing?
Crankshaft bearings do not have a fixed replacement interval and are typically replaced only when they show signs of failure. Always inspect them during a major engine rebuild.
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.
Payment & Security
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