Upper Main Bearing – Fits Yamaha Outboard 115-225 HP (Replaces 93311-940U3-00)
Upper Main Bearing – Fits Yamaha Outboard 115-225 HP (Replaces 93311-940U3-00) is backordered and will ship as soon as it is back in stock.
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Upper Main Bearing – Fits Yamaha Outboard 115-225 HP (Replaces 93311-940U3-00) is backordered and will ship as soon as it is back in stock.
Product Details
This Upper Main Bearing – Fits Yamaha Outboard 115-225 HP (Replaces 93311-940U3-00) is a crucial internal component designed for a wide range of Yamaha 2-stroke and 4-stroke outboard engines manufactured from 1984 to 2015. It ensures smooth crankshaft rotation, supporting engine reliability and performance.
It serves as a direct replacement for Yamaha part number 93311-940U3-00 and Red Rhino reference YA-B940.
- Installation involves internal engine disassembly.
- Constructed from durable steel with a roller bearing design.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Yamaha | 93311-940U3-00 |
| Red Rhino | YA-B940 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
This bearing is verified to fit the following Yamaha outboard models.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Yamaha | V6 Special | 150-225 | 2-Stroke | 1984–1986 | 93311-940U3-00 | |
| Yamaha | V6 Excel | 150-225 | 2-Stroke | 1987–1989 | 93311-940U3-00 | |
| Yamaha | ETL/ETX | 115 | 2-Stroke | 1984–1990 | 93311-940U3-00 | |
| Yamaha | ETL/ETX | 130 | 2-Stroke | 1988–1990 | 93311-940U3-00 | |
| Yamaha | ETL/ETX | 150 | 2-Stroke | 1984–1990 | 93311-940U3-00 | |
| Yamaha | ETL/ETX | 175 | 2-Stroke | 1984–1990 | 93311-940U3-00 | |
| Yamaha | ETL/ETX | 200 | 2-Stroke | 1984–1990 | 93311-940U3-00 | |
| Yamaha | ETL/ETX | 225 | 2-Stroke | 1990 | 93311-940U3-00 | |
| Yamaha | ETL-JD | 115-200 | 2-Stroke | 1987–1990 | 93311-940U3-00 | |
| Yamaha | L-ETX | 150-200 | 2-Stroke | 1986–1990 | 93311-940U3-00 | |
| Yamaha | TLR/TXR/TJR | 115 | 2-Stroke | 1991–2015 | 93311-940U3-00 | |
| Yamaha | TLR/TXR | 130 | 2-Stroke | 1991–2004 | 93311-940U3-00 | |
| Yamaha | TLR/TXR/TJR | 150 | 2-Stroke | 1991–2015 | 93311-940U3-00 | |
| Yamaha | TLR/TXR | 175 | 2-Stroke | 1991–2000 | 93311-940U3-00 | |
| Yamaha | TLR/TXR/TJR | 200 | 2-Stroke | 1991–1998 | 93311-940U3-00 | |
| Yamaha | TLR/TXR | 225 | 2-Stroke | 1991–1997 | 93311-940U3-00 | |
| Yamaha | B-TLR | 115 | 2-Stroke | 1998–1999 | 93311-940U3-00 | |
| Yamaha | C-TLR/TXR | 115-150 | 2-Stroke | 1991–2000 | 93311-940U3-00 | |
| Yamaha | L-TXR | 130-150 | 2-Stroke | 1991–2001 | 93311-940U3-00 | |
| Yamaha | LX-TXR | 150 | 2-Stroke | 1999–2001 | 93311-940U3-00 | |
| Yamaha | LZ-TXR | 150 | 2-Stroke | 2000–2015 | 93311-940U3-00 | |
| Yamaha | P-TLR | 115-200 | 2-Stroke | 1991–1999 | 93311-940U3-00 | |
| Yamaha | S-TLR/TXR | 115-200 | 2-Stroke | 1996–1999 | 93311-940U3-00 | |
| Yamaha | SX-TXR | 200 | 2-Stroke | 1999–2005 | 93311-940U3-00 | |
| Yamaha | Pro-V | 150 | 2-Stroke | 1986–1990 | 93311-940U3-00 | |
| Yamaha | D-TLR/DX-TLR | 150 | 2-Stroke | 1997–2005 | 93311-940U3-00 | |
| Yamaha | V-TLR/VZ-TLR | 175 | 2-Stroke | 2000–2015 | 93311-940U3-00 | |
| Yamaha | Z-TLR/TXR | 175-200 | 2-Stroke | 2000–2015 | 93311-940U3-00 |
Technical Specs
- Product Type
- Upper Main Crankshaft Bearing
- Installation
- Internal Engine Component
- Housing Material
- Steel with Roller Bearing
- Dimensions
- 9.0" L x 9.0" W x 5.0" H
- Weight
- 380 g (0.84 lb)
- Other Technical Attributes
- Crankshaft Roller Bearing
What’s in the Box
- 1 x Bearing (93311-940U3-00)
Installation Notes
- Consult your engine’s official service manual before beginning. Disconnect the battery and all related electrical and fuel lines.
- Proceed with the disassembly of the powerhead to gain access to the engine block and crankshaft assembly.
- Carefully remove the fasteners securing the old upper main bearing cap and lift away the old bearing halves.
- meticulously clean the crankshaft journal and the bearing saddle in the engine block, ensuring they are free of oil, debris, and burrs.
- Apply a generous coat of engine assembly lube or clean engine oil to the new bearing shells and the crankshaft journal.
- Install the new bearing, paying close attention to any locating tangs or markings to ensure correct orientation.
- Reinstall the bearing cap and torque the fasteners to the precise specifications listed in your service manual.
- Complete the reassembly of the engine, reconnect all systems, and verify fluid levels before attempting to start.
Troubleshooting & FAQ
How do I know if my upper main bearing is failing?
Common signs of a worn main bearing include a deep knocking or rumbling sound from the engine that increases with RPM, low oil pressure, and the presence of metallic particles in the engine oil during an oil change. Severe failure can lead to catastrophic engine damage.
Can this bearing be used in any position on the crankshaft?
No, this bearing is specifically designed as the upper main bearing. Crankshafts have multiple bearings that may differ in size and design. Always use the exact replacement part number specified for each position.
Is a special break-in procedure needed after installation?
While no special break-in is required for the bearing itself, it is good practice to run the engine at varying, moderate RPMs for the first few hours after a major engine service like this. Avoid full-throttle operation immediately. Always follow the guidelines in your engine's service manual.
What causes main bearings to fail prematurely?
The most common causes are oil starvation, contamination of the oil (with fuel, coolant, or dirt), improper installation (incorrect torque or orientation), or excessive load and operational stress beyond the engine's design limits.
Is this part for both 2-Stroke and 4-Stroke models?
Yes, the compatibility table confirms this bearing fits a wide range of Yamaha V-type 2-stroke engines from 1984 onwards. Always verify your specific model and year in the list provided.
What is the difference between OEM and this aftermarket part?
This listing is an aftermarket replacement (not OEM). It's built to OEM-level specifications with comparable materials and manufactured in an ISO 9002 facility, with batch inspections for consistency. It offers a high-quality alternative at a more competitive price point.
How fast is shipping?
We ship worldwide quickly—typical transit time is 5–15 days. Standard shipping is free, with expedited options appearing at checkout where available for your region.
What is the warranty and return policy?
This product is covered by a 1-year warranty against manufacturing defects under normal use. If any issues arise, contact our support team with your order details. Returns are accepted within our standard window for items that are unused and in their original condition. Please see our full 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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