SEI 90-428 – 76° V6 Aftermarket Counter Rotation Lower Unit – Replacement for Yamaha Outboard 200–250HP 2/4 Stroke – Fits 25″, 30″ Shafts –

Original price was: $1,416.45.Current price is: $1,349.00.

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

“Yamaha 76 Degree V6 200-250 HP Counter Rotation Outboard Lower Unit 90-428. Replace your old outboard lower unit with this premium quality, 100% brand new & authentic Yamaha V6 lower unit, designed for counter rotation use only.”

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Manufacturer Warranty: 3-Year

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Return Policy: 60-day, hassle-free returns

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Trusted by 6,000+ boaters across the USA

Description

Replaces most 200HP/225HP and some 250HP Yamaha 76 Degree V6 Counter Rotation Motors with a 1.81 Ratio
Replaces most 200HP/225HP Yamaha V6 4-Stroke Counter Rotation Motors with a 2.00 Ratio
For Counter Rotation only, do not use for Standard Rotation
The paint color is black. You can paint it to match.

90-428-A25 (1.81:1 Ratio / 25″ Shaft / Left Hand Rotation)

This counter-rotation gear case replaces most Yamaha 2 Stroke V6 3.1 and 3.2 Liter (225HP / 250HP) Engines.

  • LZ250TXR Series:
    • 2005: LZ250TXRD
    • 2004: LZ250TXRC
    • 2003: LZ250TXRB
  • LX225/LX250TXR Series:
    • 2003: LX225TXRB, LX250TXRB
    • 2002: LX225TXRA, LX250TXRA
    • 2001: LX225TXRZ, LX250TXRZ
    • 2000: LX225TXRY, LX250TXRY
  • L225/L250TXR Series:
    • 1999: L225TXRX, L250TXRX
    • 1998: L225TXRW, L250TXRW
    • 1997: L225TXRV, L250TXRV
    • 1996: L225TXRU, L250TXRU
    • 1995: L225TXRT, L250TXRT
    • 1994: L225TXRS, L250TXRS
    • 1993: L250TXRR
    • 1992: L250TXRQ
    • 1991: L250TXRP
    • 1990: L250ETXD

90-428-A30 (1.81:1 Ratio / 30″ Shaft / Left Hand Rotation)

This counter-rotation gear case replaces most Yamaha 2 Stroke V6 3.1 and 3.2 Liter (200HP/225HP/ and some 250HP) Engines. For Counter Rotation only, do not use for Standard Rotation.

  • LZ250TUR Series:
    • 2005: LZ250TURD
    • 2004: LZ250TURC
    • 2003: LZ250TURB
  • LX250TUR Series:
    • 2002: LX250TURA
    • 2001: LX250TURZ
    • 2000: LX250TURY
  • L250TUR/L225TUR Series:
    • 1999: L250TURX
    • 1998: L225TURW, L250TURW
    • 1997: L225TURV, L250TURV
    • 1996: L225TURU, L250TURU
    • 1995: L225TURT, L250TURT
    • 1994: L250TURS
    • 1993: L250TURR
    • 1992: L250TURQ

90-428-B25F (2.0:1 Ratio / 25″ Shaft / Left Hand Rotation)

This counter-rotation gear case replaces most Yamaha Four Stroke V6 200HP – 225HP Engines.

  • LF200XA Series: 2019-2011
  • LF200/LF225TXR Series:
    • 2010: LF200TXR, LF225TXR
    • 2009: LF200TXR, LF225TXR
    • 2008: LF200TXR, LF225TXR
    • 2007: LF200TXR, LF225TXR
    • 2006: LF200TXR, LF225TXR
    • 2005: LF200TXRD, LF225TXRD
    • 2004: LF200TXRC, LF225TXRC
    • 2003: LF200TXRB, LF225TXRB
    • 2002: LF200TXRA, LF225TXRA

90-428-B30F (2.0:1 Ratio / 30″ Shaft / Left Hand Rotation)

This counter-rotation gear case replaces most Yamaha Four Stroke V6 225HP Engines.

  • LF225TUR Series:
    • 2005: LF225TURD
    • 2004: LF225TURC
    • 2003: LF225TURB
    • 2002: LF225TURA
Additional information
Weight 65 lbs
Dimensions 65 × 37 × 10 in
Degree/Motor/Length

3.1L&3.2L/Two Stroke V6/25" Shaft/1.8 Ratio/Left Hand Rotation

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3.1L&3.2L/Two Stroke V6/30" Shaft/1.8 Ratio/Left Hand Rotation

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6 Cylinder/Four Stroke V6/25" Shaft/2.0 Ratio/Left Hand Rotation

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6 Cylinder/Four Stroke V6/30" Shaft/2.0 Ratio/Left Hand Rotation

Brand

Brand

SEI

Reviews (25)
4.2
25 reviews
10
11
4
0
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25 reviews for SEI 90-428 – 76° V6 Aftermarket Counter Rotation Lower Unit – Replacement for Yamaha Outboard 200–250HP 2/4 Stroke – Fits 25″, 30″ Shafts –

Clear filters
  1. Pamela Carpenter

    The customer team helped me verify compatibility with my 2005 motor. The unit arrived undamaged, installed smoothly, and outperforms my old part. Silent shifts and no vibrations—extremely satisfied!

  2. Scott Rodgers

    This unit survived a month-long expedition in Alaskan waters. No corrosion, no leaks, and shifts are as smooth as day one. OEM engineers should take notes!

  3. Robert Ramsey

    No more jerky shifts. Smooth as silk now!

  4. Carolyn Riggs

    Used for waterskiing and cruising—excellent performance. Unbeatable price!

  5. Jonathan Warner

    The customer team answered my pre-purchase questions promptly. The unit itself is robust, shifts smoothly, and resists corrosion. A hassle-free upgrade!

  6. Jason Sanders

    Whisper-quiet—can finally hear the waves again!

  7. Robert Garcia

    Final gem—flawless close!

  8. Robert Richards

    Replaced my lower unit in 50 minutes—no mechanic needed. The splines aligned flawlessly, and the anti-vibration design eliminates cockpit noise. Handles rough wakes like a champ. 10/10!

  9. Teresa Jenkins

    The customer support team walked me through a minor alignment question via email. The unit itself is robust—no leaks, no noise, and perfect compatibility with my 150HP engine. A+ experience!

  10. Lindsey Garza

    Crisp shifts—saved my boat!

  11. Shawn Allen

    Leak-free—reliable upgrade!

  12. Jesse Hubbard

    I’ve tested this in mudflats and open water—it hasn’t missed a beat. The stainless steel construction resists corrosion, and the shifts are crisp. A reliable workhorse!

  13. Caitlyn Smith

    confidence-inspiring! Installation took 40 minutes, and performance is flawless. A smart choice for value-conscious boaters!

  14. Cody Gonzalez

    Week-long testing—zero issues. Handles heavy loads easily.

  15. Sheri Hunt

    Rust-proof bolts—matches OEM. Smart buy!

  16. Elizabeth Barton

    The customer team sent a follow-up email to confirm satisfaction. The unit itself is leak-proof, shifts seamlessly, and handles heavy loads. A rare five-star experience!

  17. Kathy Rogers

    The delivery was lightning-fast, arriving two days earlier than promised. Installation was straightforward thanks to the detailed manual, and the unit fits my 2018 motor perfectly. No issues after three weekend trips!

  18. Kelly Leblanc

    Salt, sun, storms—endures!

  19. Kelly Trevino

    This unit arrived with a pre-installed gasket, saving me time. After two months of heavy use, there’s no wear on the gears or seals. A stellar value!

  20. Kevin Simon

    The anti-vibration design reduces cockpit noise significantly. Installed it in 45 minutes, and shifts are buttery-smooth. Premium feel without the premium price!

  21. Anthony Diaz DDS

    The unit’s powder-coated finish resists chips and scratches. Installation took 35 minutes, and performance is flawless. Why spend more on overpriced OEM parts?

  22. Lucas Conley

    Snug splines, silent operation. Half the cost, zero flaws—perfection!

  23. Kevin Jones

    Excel in tournaments and leisure. Unbeatable value!

  24. Krystal Hurley

    After struggling with a noisy OEM unit, this was a welcome upgrade. The operation is whisper-quiet, and the shifts are buttery-smooth. Installation took 35 minutes—highly recommend!

  25. Jessica Lam

    I paired this with a hydrofoil, and the combo is unstoppable. The unit handles sudden throttle changes effortlessly, and the oil stays crystal clear. Worth every penny!

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