Ball Bearing – Fits Yamaha 3-90 HP Outboards (Replaces 93306-204Y7, 93306-20401)
Ball Bearing – Fits Yamaha 3-90 HP Outboards (Replaces 93306-204Y7, 93306-20401) 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 3-90 HP Outboards (Replaces 93306-204Y7,...
Product Details
This is a high-quality aftermarket Ball Bearing for Yamaha 3-90 HP Outboards, serving as a critical internal engine component. It is designed to fit a wide range of Yamaha 2-stroke and 4-stroke outboard motors manufactured from 1984 to the present, ensuring reliable performance in various crankshaft and engine block applications.
It is a direct replacement for Yamaha part numbers 93306-204Y7, 93306-20401, 93306-20411, 93306-204U0, and Mercury/Mariner 30-18859M.
- Installation: Internal engine component installed via press fit.
- Construction: Sealed ball bearing with a durable steel housing.
- Inclusions: Includes one ball bearing for a complete replacement.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket suppliers.
| Brand | Part Number | Notes |
|---|---|---|
| Yamaha | 93306-204Y7 | Primary replacement number. |
| Yamaha | 93306-20401 | Interchangeable part number. |
| Yamaha | 93306-20411 | Interchangeable part number. |
| Yamaha | 93306-204U0 | Interchangeable part number. |
| Mercury / Mariner | 30-18859M | Equivalent part for specific Mercury/Mariner models. |
Engine & Model Compatibility
Confirm your engine model and year in the table below to ensure accurate fitment.
For Yamaha applications, this bearing is used in numerous 2-stroke and 4-stroke models, from small portables to mid-range outboards.
For Mercury/Mariner applications, this part cross-references to models that are often based on Yamaha powerheads.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Yamaha | E40GMH, 40GWH | 40 | 2-Stroke | 1984–1995 | 93306-20401 / 93306-204Y7 | Crankshaft bearing |
| Yamaha | E40X, 40XMH | 40 | 2-Stroke | 1986–1998 | 93306-20401 / 93306-204Y7 | Crankshaft bearing |
| Yamaha | 6B, 8B, E8D | 6–8 | 2-Stroke | 1986–1998 | 93306-204U0 | Crankshaft bearing |
| Yamaha | 4ACMH, 4A, 4AS, 4MSH, 4KZ | 4–5 | 2-Stroke | 1984–1999 | 93306-204U0 | Engine block bearing |
| Yamaha | 6C, 6D, 8C, 8D | 6–8 | 2-Stroke | 1986–2001 | 93306-204U0 | Crankshaft bearing |
| Yamaha | F2.5 | 2.5 | 4-Stroke | 2003–present | 93306-204Y7 | Cylinder & crankcase bearing |
| Yamaha | F4, F5, F6 | 4–6 | 4-Stroke | 1999–present | 93306-204Y7 | Cylinder & crankcase bearing |
| Yamaha | 9.9, 15 | 9.9–15 | 2-Stroke | 1984–2018 | 93306-204Y7 | Various application points |
| Yamaha | F8, F9.9 | 8–9.9 | 4-Stroke | 1998–2007 | 93306-204Y7 | Various application points |
| Yamaha | F25 | 25 | 4-Stroke | 1998–2018 | 93306-204Y7 | Various application points |
| Yamaha | Various models | 25–90 | 2-Stroke & 4-Stroke | 1984–present | 93306-204Y7 | Multiple applications across models |
| Mercury/Mariner | 4A | 4 | 2-Stroke | 1986–1999 | 30-18859M | Crankshaft & block parts |
| Mercury/Mariner | 6C, 6D, 8C | 6–8 | 2-Stroke | 1986–2001 | 30-18859M | Crankshaft & block parts |
| Mercury/Mariner | 8K, W8 | 8 | 2-Stroke | 1986–1998 | 30-18859M | Crankshaft & block parts |
Technical Specs
- Product Type
- Ball Bearing
- Installation
- Internal Engine Component
- Housing Material
- Steel
- Housing Color
- Silver/Metallic
- Dimensions
- 5.0 x 6.0 x 6.0
- Fitting Type
- Press Fit
- Warranty
- Standard Aftermarket Parts Warranty
- Other Technical Attributes
- Sealed ball bearing, multiple application points in Yamaha outboard engines
What’s in the Box
- 1 x Ball Bearing (Replaces 93306-204Y7 / 93306-20401 / 93306-204U0)
Installation Notes
- Installation of this internal engine bearing is a technical procedure that requires engine disassembly.
- Always consult your engine's official service manual for detailed instructions and torque specifications.
- Using a professional bearing press is highly recommended to ensure the bearing is seated correctly without causing damage to the bearing or engine case.
- Ensure all surrounding components are clean and free of debris before installing the new bearing.
Troubleshooting & FAQ
How do I know if this bearing fits my specific engine model?
The most reliable method is to cross-reference the part number stamped on your old bearing or listed in your service manual with the numbers provided in our Part Number Matrix (93306-204Y7, 93306-20401, etc.). You can also check our detailed compatibility table, but always verify the part number first.
What are the signs of a failing engine bearing?
Common symptoms include a grinding or rumbling noise from the engine, increased vibration, metallic particles in the oil, or noticeable play in the crankshaft. If you notice any of these signs, immediate inspection is recommended to prevent further engine damage.
Is a special tool required for installation?
Yes, a bearing press or a suitable driver set is typically required for safe and correct installation. Attempting to install the bearing with improper tools (like a hammer) can damage the bearing, crankshaft, or engine block.
What is the difference between the various Yamaha part numbers this replaces?
The different part numbers (e.g., 93306-204Y7, 93306-20401, 93306-204U0) typically represent supersessions or minor revisions by the manufacturer over the years. They are functionally identical and interchangeable for the listed applications.
Is this an OEM part or an aftermarket one?
This listing is for a high-quality aftermarket replacement part, not an OEM component. It is built to meet or exceed OEM specifications using comparable materials and is manufactured in an ISO 9002 certified facility with rigorous batch-inspections for quality assurance.
How much does shipping cost and how fast is it?
We ship worldwide quickly, with typical transit times of 5–15 days for most regions. Standard shipping is free. Expedited shipping options, if available for your location, will be presented at checkout.
What is the warranty and return policy?
This product is covered by a 1-year warranty against manufacturing defects under normal use conditions. If you encounter an issue, please contact our support team with your order details. Returns are accepted within our standard return window for items that are unused and in their original condition. Please see our full policy page or contact us for instructions.
Safety & Important Info
- Verify images and specifications against your original part before purchase. If anything differs—even if your model is listed as compatible—do not order.
- This is an aftermarket replacement component, not an original equipment manufacturer (OEM) part.
- Professional installation by a qualified marine mechanic is strongly recommended for safety, performance, and to prevent damage.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and rigorously tested for real-world durability.
- Fast Global Fulfillment — We offer free standard delivery to most regions with an average transit time of 5–15 days.
- Manufacturer-Direct Value — By working directly with manufacturers, we provide fair pricing without compromising on materials or quality control.
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