New Yamaha 200–250HP 2/4-Stroke (1990–2019) Replacement Lower Unit | Aftermarket | Counter Rotation | Fits 25″ & 30″ Shafts | 3-Year Warranty
Original price was: $1,552.89.$1,399.00Current price is: $1,399.00.
New Yamaha F75–100 | F75/90A 4-Stroke (1999–2017) Replacement Lower Unit | Aftermarket | Fits 20″ & 25″ Shafts | New or Remanufactured | 1-Year Warranty
Original price was: $2,685.09.$2,299.00Current price is: $2,299.00.
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New Yamaha 250HP 4-Stroke (2005–2018) Counter-Rotation Replacement Lower Unit Aftermarket | Fits 25″ & 30″ Shafts | 2.00 Gear Ratio | 1-Year Warranty
Original price was: $1,921.90.$1,699.00Current price is: $1,699.00.
Need help finding the right lower unit?
- Unsure about compatibility? Our team can verify the perfect fit for your Yamaha model.
- Call us at 888-812-6287 — we’re happy to guide you.
- Or fill out the form below in chatbox and we’ll respond quickly with the right match.
Description
Enhance the performance and reliability of your Yamaha LF250 4-Stroke outboard with this high-quality aftermarket counter-rotation lower unit from SEI Marine Products. Engineered for precision, smooth operation, and long-lasting durability — this replacement gearcase delivers OEM-level performance for Yamaha 250HP engines manufactured between 2005 and 2018.
🔧 Key Features
- Perfect Fit for Yamaha LF250 Outboards
Designed specifically for counter-rotation (left-hand) applications on Yamaha LF250 4-Stroke engines. Direct-fit installation means no modifications are needed — simply bolt on and go. - Dual & Side Water Intake Compatibility
Supports both early-model side intakes and later-model dual water intakes, ensuring consistent cooling across all conditions. - Built for Strength & Longevity
Features a one-piece driveshaft, precision-cut gears, and a water-cooled bearing carrier for reduced friction, longer life, and smoother gear engagement. - OEM-Like Finish
Finished in durable black paint that can be repainted to match your Yamaha factory color for a clean, professional look. - Reliable Performance Assurance
Tested for strength and endurance, this lower unit is backed by a 1-Year Limited Warranty — delivering confidence and peace of mind on every trip.
⚙️ Specifications
| Feature | Details |
|---|---|
| Horsepower | 250HP |
| Compatible Models | Yamaha LF250 4-Stroke (Counter Rotation) |
| Years Covered | 2005 – 2018 |
| Gear Ratio | 2.00:1 |
| Rotation | Counter (Left-Hand) |
| Shaft Lengths | 25″ & 30″ |
| Water Intakes | Dual & Side Compatible |
| Driveshaft Type | One-Piece |
| Finish | Black (Paintable to Match OEM) |
| Condition | 100% Brand New – Aftermarket |
| Warranty | 1-Year Limited |
| OEM Replaces | LF250XA, LF250TXR, LF250UA, LF250TUR, LF250BTXR, LF250BTUR, LF250TURD |
| Part Numbers | 90-429-B25F (25″), 90-429-B30F (30″) |
| Installation | Direct Fit – No Modifications Required |
💡 Why Choose This Yamaha 250HP Counter Rotation Lower Unit?
This SEI replacement lower unit is a complete, factory-assembled, brand-new gearcase — not remanufactured or rebuilt. It arrives ready to install, pre-filled with quality components, and pressure-tested for performance. Perfect for restoring or upgrading your twin-engine Yamaha setup, it provides smooth handling, strong torque, and dependable counter-rotation control in any marine environment.
✅ Designed for Yamaha 250HP LF250 4-Stroke outboards (2005–2018)
✅ 100% brand new, not remanufactured
✅ Direct OEM-fit design — no modifications required
✅ Backed by SEI’s trusted 1-year warranty
Looking for Other Yamaha Models or Rotations?
👉 Browse all Yamaha Lower Units — including standard and counter-rotation options for 75HP, 150HP, 200HP, and 300HP Yamaha outboards.
Additional information
| Weight | 90 lbs |
|---|---|
| Dimensions | 23 × 13 × 31 in |
| Ratio/Shaft |
F250/ 25" Shaft/ 2.00/4 Stroke ,F250/ 30" Shaft/ 2.00/4 Stroke |
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