Lower Casing Cap Rebuild Kit – Fits Yamaha 25HP 30HP (Replaces 61N-45361)
Lower Casing Cap Rebuild Kit – Fits Yamaha 25HP 30HP (Replaces 61N-45361) is backordered and will ship as soon as it is back in stock.
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Delivery and Shipping
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Lower Casing Cap Rebuild Kit – Fits Yamaha 25HP 30HP (Replaces 61N-...
Lower Casing Cap Rebuild Kit – Fits Yamaha 25HP 30HP (Replaces 61N-45361) is backordered and will ship as soon as it is back in stock.
Product Details
This Lower Casing Cap Rebuild Kit is engineered for Yamaha 25HP and 30HP outboard motors, as well as compatible Parsun, Hidea, Seapro, HDX, and HANGKAI 2-stroke and 4-stroke engines. Designed for the lower casing drive assembly, this kit delivers a complete bearing and seal refresh for models spanning 1997 through 2006 and later F25 series engines.
Direct aftermarket replacement for Yamaha OEM part number 61N-45361-01-4D.
- Includes bearings, oil seals, and O-rings for complete lower casing cap service
- Compatible with both 2-stroke and 4-stroke outboard configurations
- Not compatible with 6L2 models due to different outer diameter specifications
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number | Notes |
|---|---|---|
| Yamaha | 61N-45361 | Primary OEM reference |
| Yamaha | 61N-45361-01-4D | Full OEM part number |
| Yamaha | 6L2-45361-03-8D | Not compatible—different outer diameter |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
| Year | Model | Component |
|---|---|---|
| 1997 | C30ELRV | LOWER CASING DRIVE 1 |
| 1998 | F25ELHW | LOWER CASING DRIVE 1 |
| 1998 | F25ELRW | LOWER CASING DRIVE 1 |
| 1998 | F25ESHW | LOWER CASING DRIVE 1 |
| 1998 | F25TLRW | LOWER CASING DRIVE 1 |
| 1999 | F25ELHX | LOWER CASING DRIVE 1 |
| 1999 | F25ELRX | LOWER CASING DRIVE 1 |
| 1999 | F25ESHX | LOWER CASING DRIVE 1 |
| 1999 | F25MLHX | LOWER CASING DRIVE 1 |
| 1999 | F25MSHX | LOWER CASING DRIVE 1 |
| 1999 | F25TLRX | LOWER CASING DRIVE 1 |
| 2000 | F25ELHY | LOWER CASING DRIVE 1 |
| 2000 | F25ELRY | LOWER CASING DRIVE 1 |
| 2000 | F25ESHY | LOWER CASING DRIVE 1 |
| 2000 | F25MLHY | LOWER CASING DRIVE 1 |
| 2000 | F25MSHY | LOWER CASING DRIVE 1 |
| 2000 | F25TLRY | LOWER CASING DRIVE 1 |
| 2001 | F25ELHZ | LOWER CASING DRIVE 1 |
| 2001 | F25ELRZ | LOWER CASING DRIVE 1 |
| 2001 | F25ESHZ | LOWER CASING DRIVE 1 |
| 2001 | F25ESRZ | LOWER CASING DRIVE 1 |
| 2001 | F25ESRZ | LOWER CASING DRIVE 11 |
| 2001 | F25MLHZ | LOWER CASING DRIVE 1 |
| 2001 | F25MSHZ | LOWER CASING DRIVE 1 |
| 2001 | F25TLRZ | LOWER CASING DRIVE 1 |
| 2002 | F25ELHA | LOWER CASING DRIVE 1 |
| 2002 | F25ELRA | LOWER CASING DRIVE 1 |
| 2002 | F25ESHA | LOWER CASING DRIVE 1 |
| 2002 | F25ESRA | LOWER CASING DRIVE 1 |
| 2002 | F25MLHA | LOWER CASING DRIVE 1 |
| 2002 | F25MSHA | LOWER CASING DRIVE 1 |
| 2002 | F25TLRA | LOWER CASING DRIVE 1 |
| 2003 | F25ELHB | LOWER CASING DRIVE 1 |
| 2003 | F25ELRB | LOWER CASING DRIVE 1 |
| 2003 | F25ESHB | LOWER CASING DRIVE 1 |
| 2003 | F25ESRB | LOWER CASING DRIVE 1 |
| 2003 | F25MLHB | LOWER CASING DRIVE 1 |
| 2003 | F25MSHB | LOWER CASING DRIVE 1 |
| 2003 | F25TLRB | LOWER CASING DRIVE 1 |
| 2004 | F25ELHC | LOWER CASING DRIVE 1 |
| 2004 | F25ELRC | LOWER CASING DRIVE 1 |
| 2004 | F25ESHC | LOWER CASING DRIVE 1 |
| 2004 | F25ESRC | LOWER CASING DRIVE 1 |
| 2004 | F25MLHC | LOWER CASING DRIVE 1 |
| 2004 | F25MSHC | LOWER CASING DRIVE 1 |
| 2004 | F25TLRC | LOWER CASING DRIVE 1 |
| 2005 | F25ELHD | LOWER CASING DRIVE 1 |
| 2005 | F25ELRD | LOWER CASING DRIVE 1 |
| 2005 | F25ESHD | LOWER CASING DRIVE 1 |
| 2005 | F25ESRD | LOWER CASING DRIVE 1 |
| 2005 | F25MLHD | LOWER CASING DRIVE 1 |
| 2005 | F25MSHD | LOWER CASING DRIVE 1 |
| 2005 | F25TLRD | LOWER CASING DRIVE 1 |
| 2006 and Later | F25ELH | LOWER CASING DRIVE 1 |
| 2006 and Later | F25ELR | LOWER CASING DRIVE 1 |
| 2006 and Later | F25ESH | LOWER CASING DRIVE 1 |
| 2006 and Later | F25ESR | LOWER CASING DRIVE 1 |
| 2006 and Later | F25LA | LOWER CASING DRIVE 1 |
| 2006 and Later | F25LA_0112 | LOWER CASING DRIVE 1 |
| 2006 and Later | F25LA_0411 | LOWER CASING DRIVE 1 |
| 2006 and Later | F25LEA | LOWER CASING DRIVE 1 |
| 2006 and Later | F25LEA_011 | LOWER CASING DRIVE 1 |
| 2006 and Later | F25LEA_041 | LOWER CASING DRIVE 1 |
| 2006 and Later | F25LEHA | LOWER CASING DRIVE 1 |
| 2006 and Later | F25LEHA_04 | LOWER CASING DRIVE 1 |
| 2006 and Later | F25LEHB_01 | LOWER CASING DRIVE 1 |
| 2006 and Later | F25LMHA | LOWER CASING DRIVE 1 |
| 2006 and Later | F25LMHA_04 | LOWER CASING DRIVE 1 |
| 2006 and Later | F25LMHB_01 | LOWER CASING DRIVE 1 |
| 2006 and Later | F25MLH | LOWER CASING DRIVE 1 |
| 2006 and Later | F25MSH | LOWER CASING DRIVE 1 |
| 2006 and Later | F25SEA | LOWER CASING DRIVE 1 |
| 2006 and Later | F25SEA_011 | LOWER CASING DRIVE 1 |
| 2006 and Later | F25SEA_041 | LOWER CASING DRIVE 1 |
| 2006 and Later | F25SEHA | LOWER CASING DRIVE 1 |
| 2006 and Later | F25SEHA_04 | LOWER CASING DRIVE 1 |
| 2006 and Later | F25SMHA | LOWER CASING DRIVE 1 |
| 2006 and Later | F25SMHA_01 | LOWER CASING DRIVE 1 |
| 2006 and Later | F25SMHA_04 | LOWER CASING DRIVE 1 |
| 2006 and Later | F25TLR | LOWER CASING DRIVE 1 |
Technical Specs
- OEM Part Number
- 61N-45361
- Full OEM Reference
- 61N-45361-01-4D
- Application
- Lower Casing Drive Assembly
- Compatible Brands
- Yamaha, Parsun, Hidea, Seapro, HDX, HANGKAI
- Compatible HP
- 25HP, 30HP
- Stroke Type
- 2-Stroke and 4-Stroke
- Compatibility Note
- Not compatible with 6L2 models—outer diameter differs
What's in the Box
- 93306-00612 BEARING × 1
- 93210-64ME7 O-RING × 1
- 93315-22004 BEARING × 1
- 93101-20M07 OIL SEAL × 2
- 93210-65M50 O-RING × 2
Installation Notes
- Disconnect the battery and remove the lower unit from the outboard motor following the manufacturer's service manual.
- Drain all lower unit oil and clean the exterior surfaces thoroughly.
- Remove the existing lower casing cap, taking care to note the orientation of all components.
- Inspect the cap and surrounding surfaces for wear, corrosion, or damage.
- Remove old bearings, seals, and O-rings from the casing cap.
- Clean all mounting surfaces and bearing bores with a non-abrasive cleaner.
- Install new bearings (93306-00612 and 93315-22004) using a bearing driver or press to ensure even seating.
- Lubricate and install new oil seals (93101-20M07) with the lip facing the correct direction.
- Install new O-rings (93210-64ME7 and 93210-65M50) after lightly coating with marine grease.
- Reinstall the lower casing cap, ensuring proper alignment and torque specifications per the service manual.
- Refill the lower unit with the correct grade and quantity of gear oil, checking for leaks.
- Reinstall the lower unit onto the motor and reconnect the battery.
Troubleshooting & FAQ
How do I know if this kit fits my engine?
Cross-reference your engine model and year with the compatibility table above. Verify that your lower unit uses OEM part number 61N-45361-01-4D. If you have a 6L2 model, this kit will not fit due to different outer dimensions.
What are the signs that this rebuild kit is needed?
Common symptoms include oil leaks around the lower casing cap, unusual noise or vibration from the lower unit, difficulty shifting gears, or visible corrosion on seals and bearings during routine maintenance.
Can I install this kit myself?
Installation requires removal of the lower unit and proper bearing and seal installation tools. If you have mechanical experience and the correct service manual, it is possible. Otherwise, professional installation is recommended to ensure correct torque and alignment.
Is this kit compatible with both 2-stroke and 4-stroke engines?
Yes, this rebuild kit is designed for both 2-stroke and 4-stroke Yamaha 25HP and 30HP outboards, as well as compatible Parsun, Hidea, Seapro, HDX, and HANGKAI engines.
What is the difference between this and the 6L2-45361-03-8D kit?
The inner diameters are the same, but the outer diameters differ. The 6L2 kit cannot be used on 61N models and vice versa. Always verify your engine's exact part number before ordering.
How often should I replace these seals and bearings?
Replace as needed based on inspection during routine lower unit service, typically every 100–200 hours of operation or annually. Replace immediately if you notice oil leaks, rough bearing operation, or visible seal damage.
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 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.
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