$1,548.45 Original price was: $1,548.45.$1,395.00Current price is: $1,395.00.
“Yamaha 250 HP 4 Stroke ST90-422 outboard lower unit replacement with dual water intakes and water-cooled bearing carrier for superior performance and cooling. 100% genuine and authentic product.”
Search your model no. for perfect fit
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Manufacturer Warranty: 3-Year
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Return Policy: 7 – 14 day, hassle-free returns
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Trusted by 6,000+ boaters across the USA
It is painted black but you can paint it to match your engine.
90-422-B20F replaces F225 lowers with a 20″ driveshaft.
| Year | Model Number | Shaft | Gear Ratio | SEI Part Number |
| 2009 | F225TLR | 20 | 2:1 | 90-422-B20F |
| 2008 | F225TLR | 20 | 2:1 | 90-422-B20F |
| 2007 | F225TLR | 20 | 2:1 | 90-422-B20F |
90-422-B25F replaces F250 lowers with a 25″ driveshaft.
| Year | Model Number | Shaft | Gear Ratio | SEI part number |
|---|---|---|---|---|
| 2018 | F250XA | 25 | 2:1 | 90-422-B25F |
| 2017 | F250XA | 25 | 2:1 | 90-422-B25F |
| 2016 | F250XA | 25 | 2:1 | 90-422-B25F |
| 2015 | F250XA | 25 | 2:1 | 90-422-B25F |
| 2014 | F250XA | 25 | 2:1 | 90-422-B25F |
| 2013 | F250XA | 25 | 2:1 | 90-422-B25F |
| 2012 | F250XA | 25 | 2:1 | 90-422-B25F |
| 2011 | F250TXR | 25 | 2:1 | 90-422-B25F |
| 2010 | F250TXR | 25 | 2:1 | 90-422-B25F |
| 2009 | F250BTXR | 25 | 2:1 | 90-422-B25F |
| 2009 | F250TXR | 25 | 2:1 | 90-422-B25F |
| 2008 | F250BTXR | 25 | 2:1 | 90-422-B25F |
| 2008 | F250TXR | 25 | 2:1 | 90-422-B25F |
| 2007 | F250TXR | 25 | 2:1 | 90-422-B25F |
| 2006 | F250TXR | 25 | 2:1 | 90-422-B25F |
| 2005 | F250TXRD | 25 | 2:1 | 90-422-B25F |
90-422-B30F replaces F250 lowers with a 30″ driveshaft.
| Year | Model Number | Shaft | Gear Ratio | SEI part number |
|---|---|---|---|---|
| 2013 | F250UA | 30 | 2:1 | 90-422-B30F |
| 2012 | F250UA | 30 | 2:1 | 90-422-B30F |
| 2011 | F250TUR | 30 | 2:1 | 90-422-B30F |
| 2010 | F250TUR | 30 | 2:1 | 90-422-B30F |
| 2009 | F250BTUR | 30 | 2:1 | 90-422-B30F |
| 2009 | F250TUR | 30 | 2:1 | 90-422-B30F |
| 2008 | F250BTUR | 30 | 2:1 | 90-422-B30F |
| 2008 | F250TUR | 30 | 2:1 | 90-422-B30F |
| 2007 | F250TUR | 30 | 2:1 | 90-422-B30F |
| 2006 | F250TUR | 30 | 2:1 | 90-422-B30F |
| 2005 | F250TURD | 30 | 2:1 | 90-422-B30F |
| Weight | 72 lbs |
|---|---|
| Dimensions | 60 × 37 × 10 in |
| Ratio/Shaft |
F250 / 20" Shaft / 2.00 ,F250 / 25" Shaft / 2.00 ,F250 / 30" Shaft / 2.00 |
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Ryan Bailey –
The zinc-coated bolts haven’t rusted after months in brackish water. Installation was tool-free, and the unit outperforms my old OEM part. Silent, efficient, and built to last—highly recommend!
Jeffrey Dunn –
Arrived in two days! Perfect for my emergency repair.
Mrs. Amy Smith –
Matched my engine perfectly. Installation was a cakewalk!
Ellen Marsh –
Zinc bolts resist rust. Matches OEM performance—smart buy!
Darlene Underwood –
The splines slid into place without resistance. After 100 hours of runtime, the gears show zero wear, and the shifts are buttery-smooth. A flawless, budget-friendly replacement!
Cheryl Klein –
The included torque specs ensured a proper installation. Two months later, the unit performs like new—no noise, no leaks, no regrets. A perfect aftermarket solution!
Alexander Weaver –
The customer team helped me cross-reference compatibility with my vintage motor. The unit arrived early, installed smoothly, and performs like it was custom-made. Five stars for service and product!
Tracy Thomas –
Shifts crisply, no grinding. Better than I hoped!
Erica Martinez –
The pre-greased fittings saved me time during installation. After a month, the unit shows no wear and performs flawlessly. A must-buy for boat owners!