Yamaha 4 Stroke Aftermarket Lower Unit – Replaces 250HP – Fits 20″, 25″, 30″ Shafts – SEI 90-422

Original price was: $1,548.45.Current price is: $1,395.00.

(9 customer reviews)
Use the coupon code WELCOME5 at checkout to get 5% off on your first order

“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.”

Description

Replaces F250 lower units with dual water intakes.

Also replaces early F250 lower units with side water intakes.
This unit has the watercooled bearing carrier.
It is painted black but you can paint it to match your engine.
Additional information
Weight 72 lbs
Dimensions 60 × 37 × 10 in
Ratio/Shaft

4-Stroke / 20" Shaft

,

4-Stroke / 25" Shaft

,

4-Stroke / 30" Shaft

Brand

Brand

Yamaha

Reviews (9)
3.8
9 reviews
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9 reviews for Yamaha 4 Stroke Aftermarket Lower Unit – Replaces 250HP – Fits 20″, 25″, 30″ Shafts – SEI 90-422

Clear filters
  1. 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!

  2. Jeffrey Dunn

    Arrived in two days! Perfect for my emergency repair.

  3. Mrs. Amy Smith

    Matched my engine perfectly. Installation was a cakewalk!

  4. Ellen Marsh

    Zinc bolts resist rust. Matches OEM performance—smart buy!

  5. 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!

  6. 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!

  7. 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!

  8. Tracy Thomas

    Shifts crisply, no grinding. Better than I hoped!

  9. 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!

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