New Yamaha 150–200HP 2/4-Stroke (1990–2024) Replacement Lower Unit | Aftermarket | Counter Rotation | Fits 25″ Shaft | 3-Year Warranty
Original price was: $1,572.25.$1,399.00Current price is: $1,399.00.
New Yamaha 250HP 4-Stroke (2005–2018) Replacement Lower Unit | Aftermarket | Standard Rotation | Fits 20″, 25″ & 30″ Shafts | 3-Year Warranty
Original price was: $1,572.25.$1,399.00Current price is: $1,399.00.
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New Yamaha 200–250HP V6 76° (1990–2019) Replacement Lower Unit | Aftermarket | Standard Rotation | Fits 20″, 25″ & 30″ Shafts | 3-Year Warranty
Original price was: $1,330.89.$1,199.00Current price is: $1,199.00.
Need help finding the right lower unit?
- Unsure about compatibility? Our team can verify the perfect fit for your Yamaha model.
- Call us at 888 868 7880 — we’re happy to guide you.
- Or fill out the form below in chatbox and we’ll respond quickly with the right match.
Description
New Yamaha 200–250HP V6 76° (1990–2019) Replacement Lower Unit – Aftermarket – Standard Rotation – Fits 20″, 25″ & 30″ Shafts – 3-Year Warranty
Upgrade or replace your Yamaha outboard’s lower unit with this SEI 90-416 Standard Rotation Gearcase, engineered for Yamaha V6 76° 200–250HP models. Designed for 2-stroke (3.1L/3.2L) and 4-stroke (200–225HP) engines, this unit offers OEM-level performance at a fraction of the cost.
It’s available in 20″, 25″, and 30″ shaft lengths and comes pre-painted black with a paintable surface for easy color matching. The direct-fit design ensures easy installation—no modifications needed.
Key Specifications of Yamaha 200–250HP V6 Lower Unit
| Feature | Details |
|---|---|
| Horsepower Range | 200–250 HP |
| Engine Types | 2-Stroke V6 (3.1 L / 3.2 L), 4-Stroke V6 (200–225 HP) |
| Rotation | Standard (Right-Hand) |
| Shaft Lengths | 20″, 25″, 30″ |
| Gear Ratios | 1.81:1 (2-Stroke) / 2.0:1 (4-Stroke) |
| Finish | Black (Paintable) |
| Years Covered | 1990–2019 |
| Compatibility Notes | Not for 4-Stroke F250 250 HP models |
| Installation | Direct-Fit – No Modifications Required |
| Warranty | 3-Year Fault-Free |
| Part Variants | A20 (1.81:1 / 20″), A25 (1.81:1 / 25″), A30 (1.81:1 / 30″), B25F (2.0:1 / 25″ 4-Stroke), B30F (2.0:1 / 30″ 4-Stroke) |
Why choose Yamaha 200–250HP V6 Lower Unit
Direct-fit replacement for Yamaha V6 76° 200–250HP engines
Works with both 2-stroke and 4-stroke configurations
Available in multiple shaft lengths (20″–30″)
Durable paintable black finish
Backed by a 3-Year Warranty
Frequently Asked Questions – Yamaha 200–250HP V6 Replacement Lower Unit
1. Which Yamaha outboard models are compatible with the SEI 90-416 replacement lower unit?
The SEI 90-416 lower unit is compatible with Yamaha 200–250HP 76° V6 outboards manufactured from 1990 to 2019. It supports both 2-stroke (3.1L/3.2L) and 4-stroke (200–225HP) engines, except for the 4-stroke F250 250 HP models. Available shaft lengths include 20″, 25″, and 30″ for versatile fitment across model variations.
2. What gear ratios does this lower unit offer, and how should I choose the correct one?
This lower unit is offered with gear ratios of 1.81:1 for 2-stroke engines and 2.0:1 for 4-stroke engines. Refer to your outboard’s original gear ratio indicated in the owner’s manual or on the engine’s model plate to select the appropriate ratio for optimum performance and propulsion efficiency.
3. Is the SEI 90-416 lower unit new or rebuilt, and how is its quality assured?
The SEI 90-416 replacement lower unit is a brand-new aftermarket assembly built to OEM specifications. It arrives fully assembled, painted black with a paintable surface, and backed by a 3-year fault-free warranty. This ensures OEM-level durability and performance at a more affordable price than factory units.
4. Does installation require any modifications or special preparation?
Installation is a direct bolt-on fit requiring no modifications. The unit ships painted black and ready to install, suitable for both freshwater and saltwater environments. Confirm your shaft length (20″, 25″, or 30″) and gear ratio before installation to ensure proper fit and function.
5. What warranty coverage does the SEI 90-416 lower unit include?
SEI offers a comprehensive 3-year fault-free warranty covering manufacturing defects and failures under normal recreational use. This warranty provides peace of mind by ensuring long-term reliability and support for your Yamaha 200–250HP V6 lower unit replacement.
Looking for other models or gear ratios?
Browse all Yamaha Lower Units here — find compatible options for 40HP, 60HP, 115HP, 150HP, and more Yamaha outboards.
Additional information
| Weight | 90 lbs |
|---|---|
| Dimensions | 23 × 13 × 31 in |
| Degree/Motor/Length |
.1L&3.2L/Two Stroke V6/25" Shaft /1.8 Ratio/ RH Rotation ,3.1L&3.2L/Two Stroke V6/20" Shaft/1.8 Ratio/ RH Rotation ,3.1L&3.2L/Two Stroke V6/30" Shaft /1.8 Ratio/ RH Rotation ,4Stroke/25" Shaft/2:1 Ratio/RH Rotation ,4Stroke/30" Shaft/2:1 Ratio/RH Rotation |
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