Thrust Bearing – Fits Yamaha 25/30HP 2-Stroke Outboard Motors (Replaces 93399-99951)
Thrust Bearing – Fits Yamaha 25/30HP 2-Stroke Outboard Motors (Replaces 93399-99951) is backordered and will ship as soon as it is back in stock.
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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
Thrust Bearing – Fits Yamaha 25/30HP 2-Stroke Outboard Motors (Repl...
Product Details
This high-quality Thrust Bearing – Fits Yamaha 25/30HP 2-Stroke Outboard Motors (Replaces 93399-99951) is engineered for a precise fit on a range of Yamaha, Parsun, Hidea, and Powertec 25–30 HP 2-stroke outboard engines. It serves as a crucial component, ensuring smooth rotational movement at the top of the crankshaft.
This component is a direct interchange for Yamaha OEM part number 93399-99951.
- Installation: Installs as a direct replacement for the original part.
- Application: Functions as the crankshaft top bearing.
- Material: Constructed from durable steel/iron for longevity.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Yamaha | 93399-99951 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
This bearing is a direct replacement for various 25HP and 30HP 2-stroke Yamaha outboard models.
Also confirmed to fit select 25-30HP 2-stroke outboards from Parsun, Hidea, and Powertec that use parts compatible with Yamaha's 93399-99951.
| Brand | Model | Rated HP | Stroke | OEM Part No. | Notes |
|---|---|---|---|---|---|
| Yamaha | 25B | 25 | 2-Stroke | 93399-99951 | |
| Yamaha | 25BMH | 25 | 2-Stroke | 93399-99951 | |
| Yamaha | 25BWH | 25 | 2-Stroke | 93399-99951 | |
| Yamaha | 25VE | 25 | 2-Stroke | 93399-99951 | |
| Yamaha | 25B07 | 25 | 2-Stroke | 93399-99951 | |
| Yamaha | E25BMH | 25 | 2-Stroke | 93399-99951 | |
| Yamaha | E25HMH | 25 | 2-Stroke | 93399-99951 | |
| Yamaha | 30G | 30 | 2-Stroke | 93399-99951 | |
| Yamaha | 30HMH | 30 | 2-Stroke | 93399-99951 | |
| Yamaha | 30W | 30 | 2-Stroke | 93399-99951 | |
| Yamaha | 30HWL | 30 | 2-Stroke | 93399-99951 | |
| Yamaha | 30HWC | 30 | 2-Stroke | 93399-99951 | |
| Yamaha | E30HMH | 30 | 2-Stroke | 93399-99951 | |
| Parsun | 25-30 | 2-Stroke | Compatible with Yamaha 93399-99951 | ||
| Hidea | 25-30 | 2-Stroke | Compatible with Yamaha 93399-99951 | ||
| Powertec | 25-30 | 2-Stroke | Compatible with Yamaha 93399-99951 |
Technical Specs
- Product Type
- Thrust Bearing
- Installation
- Direct replacement
- Fuel Type
- Gasoline
- Housing Material
- Steel/Iron
- Dimensions
- 5.0"L x 6.0"W x 6.0"H
- Other Technical Attributes
- Crankshaft top bearing
What’s in the Box
- 1 x Thrust Bearing (93399-99951)
Installation Notes
- Disconnect the battery and secure the engine in a service position.
- Remove the engine cowling and any other necessary components to access the powerhead.
- Carefully locate and identify the existing crankshaft top bearing.
- Using appropriate tools, remove the old bearing, taking care not to damage the crankshaft or housing.
- Thoroughly clean the mounting surface to ensure it is free of debris and old grease.
- Lubricate the new bearing with marine-grade grease before installation.
- Seat the new bearing firmly and evenly into its housing.
- Reassemble all components in the reverse order of removal, ensuring all bolts are torqued to manufacturer specifications.
- After reassembly, start the engine and listen for any unusual noises to confirm proper installation.
Troubleshooting & FAQ
How do I know if this bearing fits my exact engine model?
The best way to confirm is by matching the OEM part number 93399-99951. If your engine's service manual or existing part lists this number, it will fit. You can also check your model against the detailed compatibility table provided on this page.
What are common symptoms of a failing crankshaft thrust bearing?
Signs of a worn or failed bearing include a distinct grinding, knocking, or whirring sound from the engine, especially at higher RPMs. You might also notice increased engine vibration or a drop in overall performance.
When should this bearing be replaced?
This bearing does not have a fixed replacement interval. It should be inspected during any major engine service or rebuild and replaced if it shows any signs of wear, corrosion, or damage.
Is this a difficult part to install?
Yes, replacing a crankshaft bearing is an advanced task that requires significant engine disassembly. Due to the complexity and the need for specialized tools, we strongly recommend professional installation by a qualified marine mechanic.
What is the difference between this aftermarket part and an OEM one?
This is a high-quality aftermarket part designed to meet or exceed OEM specifications. It offers the same fit and function as the original at a more accessible price. Our parts are produced in ISO 9002 certified facilities and undergo rigorous quality control.
How fast do you ship and what does it cost?
We ship worldwide quickly—typical transit is 5–15 days. Standard shipping is free for most orders, with expedited options available at checkout where applicable.
What is the warranty and return policy?
This part is covered by a 1-year warranty against manufacturing defects under normal use. If you encounter any issues, please contact our support team with your order details. Returns are accepted within our standard window for unused items in their original condition.
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 part, 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 with a typical transit time of 5–15 days.
- Manufacturer-Direct Value — We offer fair pricing by eliminating middlemen, without compromising on materials or quality control.
Payment & Security
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