Ball Bearing with Pin – Fits Yamaha 20-30HP 2-Stroke Outboard Motors (Replaces 93306-305U3, 93306-30510)
Ball Bearing with Pin – Fits Yamaha 20-30HP 2-Stroke Outboard Motors (Replaces 93306-305U3, 93306-30510) is backordered and will ship as soon as it is back in stock.
Couldn't load pickup availability
Worry-free returns
Worry-free returns
You may return most new, unopened items within 7 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).
You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).
If you need to return an item, simply login to your account, view the order using the "Complete Orders" link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.
Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Ball Bearing with Pin – Fits Yamaha 20-30HP 2-Stroke Outboard Motor...
Product Details
This is a replacement Ball Bearing with Pin for the crankshaft assembly on Yamaha 20–30HP 2-stroke outboard motors manufactured between 1988 and 1995. Engineered with GCr15 chrome steel, it ensures durability and smooth engine operation. Its precise dimensions of 25x62x17mm and P6 precision rating meet OEM specifications for a reliable fit.
It directly replaces Yamaha OEM parts 93306-305U3-00, 93306-305U5-00, and 93306-30510, and serves as an interchange for aftermarket parts like Asaki 93306-305U3 and others.
- Installation Location: Mounts within the crankshaft assembly.
- Material: High-strength Chrome Steel/GCr15 for longevity.
- Included: Includes one ball bearing for a single replacement.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Yamaha | 93306-305U3-00 |
| Yamaha | 93306-305U5-00 |
| Yamaha | 93306-30510 |
| Asaki | 93306-305U3 |
| YFLRHENJ | 93306-305U3 |
| JYOO | 93306-305U3 |
| Generic | 6305/C3 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Yamaha | 20MSHU/20MLHU | 20 | 2-Stroke | 1988–1995 | 93306-305U3-00 | |
| Yamaha | 25MSH/25ELHW/25ESR | 25 | 2-Stroke | 1988–1995 | 93306-305U3-00 | |
| Yamaha | 25MSHD/25MSHX | 25 | 2-Stroke | 1988–1995 | 93306-305U3-00 | |
| Yamaha | 30MSHA/30ELRV/30ELD/30ESRQ | 30 | 2-Stroke | 1988–1995 | 93306-305U3-00 | |
| Yamaha | 25ELG/25ESG/25LG/25SG | 25 | 2-Stroke | 1988 | 93306-305U3-00 | |
| Yamaha | 25ELF/25ESF/25LF/25SF | 25 | 2-Stroke | 1989 | 93306-305U3-00 | |
| Yamaha | 25ELD/25ESD/25LD/25SD | 25 | 2-Stroke | 1990 | 93306-305U3-00 | |
| Yamaha | 25ELHP/25ELRP/25ESHP/25MLHP/25MSHP | 25 | 2-Stroke | 1991 | 93306-305U3-00 | |
| Yamaha | 25ELHQ/25ELRQ/25ESHQ/25MLHQ/25MSHQ | 25 | 2-Stroke | 1992 | 93306-305U3-00 | |
| Yamaha | 25ELHR/25ELRR/25ESHR/25MLHR/25MSHR | 25 | 2-Stroke | 1993 | 93306-305U3-00 | |
| Yamaha | 25ELHS/25ELRS/25ESHS/25MLHS/25MSHS | 25 | 2-Stroke | 1994 | 93306-305U3-00 | |
| Yamaha | 25ELHT/25ELRT/25ESHT/25MLHT/25MSHT | 25 | 2-Stroke | 1995 | 93306-305U3-00 | |
| Yamaha | 20DM (6L3) | 20 | 2-Stroke | 1988 | 93306-305U3-00 | International model |
| Yamaha | 20D (6L3) | 20 | 2-Stroke | 1990–1994 | 93306-305U3-00 | International model |
| Yamaha | 20DEO (6L3) | 20 | 2-Stroke | 1991–1992 | 93306-305U3-00 | International model |
| Yamaha | 20DEM (6L3) | 20 | 2-Stroke | 1993–1994 | 93306-305U3-00 | International model |
| Yamaha | 25N (6L2) | 25 | 2-Stroke | 1988–1995 | 93306-305U3-00 | International model |
| Yamaha | 25D (6L3) | 25 | 2-Stroke | 1989–1995 | 93306-305U3-00 | International model |
| Yamaha | 25MLH (6L20) | 25 | 2-Stroke | 1989–1995 | 93306-305U3-00 | International model |
| Yamaha | 25M (6L20) | 25 | 2-Stroke | 1991 | 93306-305U3-00 | International model |
| Yamaha | 25NM (6L2) | 25 | 2-Stroke | 1993–1995 | 93306-305U3-00 | International model |
Technical Specs
- Product Type
- Ball Bearing with Pin
- Installation
- Crankshaft
- Housing Material
- Chrome Steel/GCr15
- Bearing Dimensions
- 25x62x17mm
- Package Dimensions
- 9.0cm x 9.0cm x 3.6cm
- Engine Type
- 2-Stroke
- Precision Rating
- P6
- Internal Clearance
- C3
- Warranty
- 1 Year
What’s in the Box
- 1 x Bearing (Replaces 93306-305U3-00)
Installation Notes
- Disconnect the battery and remove the engine cowling.
- Drain the engine oil and remove the powerhead from the midsection.
- Carefully disassemble the engine block to access the crankshaft assembly.
- Remove the old bearing using a suitable bearing puller, taking care not to damage the crankshaft.
- Clean the crankshaft surface and bearing seat thoroughly.
- Heat the new bearing slightly or cool the crankshaft to ease installation.
- Press the new bearing evenly onto the crankshaft until fully seated.
- Ensure proper lubrication with 2-stroke oil during reassembly.
- Reassemble the engine block, powerhead, and all other components in reverse order.
- Torque all bolts to manufacturer specifications.
Troubleshooting & FAQ
What are the signs of a failing crankshaft bearing?
Common signs include a distinct knocking or rumbling sound from the engine, increased vibration, the presence of metal shavings in the engine oil, and a general loss of engine performance or RPMs.
How do I know if this is the correct bearing for my engine?
Cross-reference your existing bearing's part number with our Part Number Matrix. Also, verify that your engine's model and year are listed in the compatibility table. When in doubt, compare the 25x62x17mm dimensions with your old part.
What does the "C3" in the part number 6305/C3 mean?
C3 refers to the internal clearance of the bearing. C3 clearance is greater than standard, which is essential in high-speed engine applications to accommodate thermal expansion and prevent bearing seizure, ensuring longevity and performance.
Is this bearing pre-greased?
This bearing is coated with a light preservative oil to prevent corrosion during shipping. It is not pre-greased for final use. It must be properly lubricated with 2-stroke engine oil as part of the crankshaft installation process.
Is this an aftermarket or OEM part?
This is a high-quality aftermarket replacement part, not an OEM component. It is designed and manufactured in an ISO 9002 facility to meet or exceed original equipment specifications using comparable materials and undergoing rigorous batch inspections.
What are your shipping speeds and costs?
We ship worldwide quickly, with typical transit times of 5–15 days for most regions. Standard shipping is free. If available for your location, expedited shipping options and their costs 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 window if the product is unused and in its original packaging. Please see our full policy page or contact us for instructions.
Safety & Important Info
- Verify images and specifications against 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
Payment methods
Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.
