Differential Bearing Seal Kit For Rear Yamaha IRS YFM 350 To 450 ATV Fits YFM 350 And 450 Models
Differential Bearing Seal Kit For Rear Yamaha IRS YFM 350 To 450 ATV Fits YFM 350 And 450 Models is backordered and will ship as soon as it is back in stock.
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Differential Bearing Seal Kit For Rear Yamaha IRS YFM 350 To 450 AT...
Restore reliability to the rear differential on Yamaha IRS YFM 350/450 with this Differential Bearing Seal Kit. This all‑in‑one rebuild set replaces worn bearings and seals, prevents leaks, and preserves gear oil pressure for smooth, dependable power transfer on trails or work sites. Compatible with Yamaha IRS models across the YFM350 Grizzly IRS, YFM400 Big Bear IRS, and YFM450 Grizzly IRS families, it’s the smart upgrade when you’re fighting muddy routes or long days in the field.
What makes this aftermarket kit stand out is the combination of precision bearings and robust seals designed for harsh off‑road environments. You’re getting high‑speed ABEC3 bearings, TC double‑lip outer seals, and pre‑greased components that resist water ingress and debris. The kit is purpose‑built to restore differential performance, cut maintenance time, and keep your machine on the trail or in the field longer between services.
Comprehensive Vehicle Fitment
| Manufacturer | Models / Series | Years / Details |
|---|---|---|
| Yamaha | YFM350 Grizzly IRS | 2007–2011 |
| Yamaha | YFM400 Big Bear IRS | 2007–2012 |
| Yamaha | YFM450 Grizzly IRS | 2008–2014 |
| Yamaha | YFM450 Grizzly EPS | 2011–2014 |
| Yamaha | YFM350FGI/FGIH Grizzly 4x4 IRS | 2010–2011 |
Product Specifications
| Attribute | Details |
|---|---|
| OEM Reference Part Numbers | N/A / Yamaha OEM references vary by model year (not provided) |
| Type | Differential bearing and seal kit (rear, IRS) |
| Manufacturer | Aftermarket Replacement |
| Application | Yamaha IRS rear differential on YFM350 Grizzly, YFM400 Big Bear, YFM450 Grizzly (and EPS variants) 07–14 |
| Kits Included (bearings) | (2) 55 mm x 80 mm x 13 mm bearings |
| Kits Included (bearings, secondary) | (1) 28 mm x 72 mm x 38 mm bearing |
| Kits Included (seals) | (2) Seals 30-7205, (1) Seal 30-7204 |
| Bearing Type | High‑speed ABEC3 bearings |
| Seal Type | TC double‑lip outer seals with garter‑spring inner lip |
| Pre‑Greased | Factory pre‑greased with Chevron SR1‑2 bearing grease |
OEM & Aftermarket Cross-Reference Information
| Part Number | Brand / Type | Cross-Reference Notes |
|---|---|---|
| 25-2098 | All Balls (Rear differential bearing kit) | Rear differential bearing and seal kit for Yamaha YFM350/400 IRS; suitable for 07–12 models; includes bearings and seals |
| 25-2098-5 | All Balls (Seals‑Only variant) | Seals‑only kit covering same model range; compatible with 07–14 YFM350/400/450 IRS families |
| N/A | Yamaha OEM references | OEM part numbers vary by model/year; not listed here |
What’s Included
This kit includes all essential components to rebuild the rear differential in one box.
- 55 mm × 80 mm × 13 mm bearings
- 28 mm × 72 mm × 38 mm bearing
- Seals 30-7205 (×2)
- Seal 30-7204 (×1)
Why Choose This Aftermarket Replacement?
- Direct‑Fit Compatibility – precisely sized to restore the rear IRS diff on Yamaha YFM350/400/450 series.
- OEM Cross‑Reference – designed as a faithful aftermarket alternative that matches or exceeds original performance.
- Premium Materials – high‑speed ABEC3 bearings and TC double‑lip seals for superior protection against water and dirt.
- Performance Restoration – revives seal integrity and bearing life, reducing noise, drag, and oil loss.
- Time‑Saving Convenience – all bearings and seals included in one kit, avoiding multiple supplier searches.
- Trail & Farm Ready – engineered to endure mud, water exposure, and rugged terrain common in off‑road use.
Installation Notes:
- Start by safely draining gear oil from the rear differential and removing the differential cover to inspect the interior for wear or scoring.
- Use a proper bearing press to install the two large bearings and the smaller bearing without hammering or skewing races.
- Install seals with the correct orientation (double lip on the outside) and ensure they seat flush against the housing to prevent leaks.
- Lightly lubricate bearing surfaces and seals with clean gear oil before final seating; avoid lubricants that could degrade seal materials.
- Reassemble with new gaskets or O‑rings as required, torque cover bolts to factory specs, and refill the differential with the correct gear oil grade.
- Once assembled, run the machine briefly and check for leaks; recheck oil level after a short test ride and top off if needed.
Why Upgrade?
Running a worn rear differential bearing or seal can lead to progressive oil loss, dirt ingress, and accelerated gear wear, increasing the risk of sudden failure. Replacing with this kit restores proper sealing and bearing performance, preserving lubrication, reducing heat buildup, and extending the life of the differential in demanding trail or farm conditions.
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