Gear Case Seal Kit – Fits Suzuki DF25 V-Twin (Replaces 25700-95J00)
Gear Case Seal Kit – Fits Suzuki DF25 V-Twin (Replaces 25700-95J00) 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.).
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Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Gear Case Seal Kit – Fits Suzuki DF25 V-Twin (Replaces 25700-95J00)
Product Details
This Gear Case Seal Kit – Fits Suzuki DF25 V-Twin (Replaces 25700-95J00) provides all necessary seals for a complete lower unit rebuild. It is designed specifically for Suzuki DF25 V-Twin 4-stroke outboard models manufactured between 2006 and 2010.
It serves as a direct replacement for Suzuki OEM part 25700-95J00 and Sierra aftermarket part 18-8385.
- Enables a full service replacement for a complete gearcase rebuild.
- Contains all required seals, o-rings, and gaskets for the lower unit.
- Engineered to meet or exceed original factory specifications for a reliable seal.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Suzuki | 25700-95J00 |
| Sierra | 18-8385 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
For Suzuki owners, please note this kit is only compatible with the V-Twin engine configuration of the DF25 models listed.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Suzuki | DF25(R) | 25 | 4-Stroke | 2006–2010 | 25700-95J00 | V-Twin engine configuration only |
| Suzuki | DF25(R)S | 25 | 4-Stroke | 2006–2007 | 25700-95J00 | V-Twin engine configuration only |
Technical Specs
- Product Type
- Gearcase Seal Kit
- Installation
- Service replacement for complete gearcase rebuild
- Product Dimensions
- 7.13 × 6.0 × 0.5 in
- Weight
- 0.27 kg (0.6 lbs)
- Warranty
- OEM Suzuki warranty when purchased from authorized dealer
- Other Technical Attributes
- Contains all seals required for gearcase disassembly and reassembly
What’s in the Box
- 1 × Complete Gearcase Seal Kit (all necessary seals, o-rings, and gaskets for a lower unit rebuild)
Installation Notes
- Drain the gearcase oil completely.
- Carefully remove the lower unit assembly from the outboard motor.
- Disassemble the gearcase, taking photos and notes of component order and orientation.
- Remove all old seals, o-rings, and gaskets using appropriate seal removal tools.
- Thoroughly clean all sealing surfaces and inspect for any damage or corrosion.
- Install the new seals from the kit using a suitable seal driver set, applying a light coat of marine grease to the seal lips.
- Reassemble the gearcase components, ensuring bearings and shafts are correctly seated.
- Torque all bolts to the manufacturer's specified values.
- Pressure test the sealed gearcase to ensure there are no leaks before reinstalling.
- Reinstall the lower unit and refill with the recommended fresh gear lube.
Troubleshooting & FAQ
How do I confirm this kit fits my Suzuki DF25?
This kit is specifically designed for the V-Twin engine configuration of the Suzuki DF25, DF25R, and DF25RS models built from 2006 to 2010. Please verify your exact engine model and year before purchasing, as it is not compatible with other DF25 variations.
What are the signs of a failing gearcase seal?
Common symptoms include milky, water-contaminated gear lube (visible on the dipstick or during draining), noticeable oil leaks around the propeller shaft or driveshaft housing, or a failed pressure test during routine service.
Does this kit include every seal I need for the lower unit?
Yes, this is a comprehensive kit containing all the required seals, gaskets, and o-rings for a complete disassembly and resealing of the gearcase lower unit.
Do I need special tools for this installation?
Yes, proper installation requires specific tools such as a seal puller, a bearing and seal driver set, and a gearcase pressure tester to ensure a leak-free result. Professional installation is highly recommended if you lack these tools or experience.
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 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.
Payment & Security
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