SEI 90-405 – Aftermarket Lower Unit – Replacement for Yamaha Outboard 115–130HP 4 Stroke – Fits 20″ & 25″ Shafts

Original price was: $1,206.45.Current price is: $1,149.00.

(28 customer reviews)
Use the coupon code WELCOME5 at checkout to get 5% off on your first order
SKU: ST-90-405 Categories: , , , ,

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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 all Yamaha V-4 2-Stroke Standard Rotation Lower Units.
115HP and 130 HP only
Also fits 2000-2014 F115 4 stroke Standard Rotation models
The paint color is Black. You can paint it to match.

90-405-A20 (2:1 Ratio / 20″ Shaft / 2-Stroke) fits the following Yamaha Models:

  • 115TLR Series:
    • 2010-2006: 115TLR
    • 2005: 115TLRD
    • 2004: 115TLRC
    • 2003: 115TLRB
    • 2002: 115TLRA
    • 2001: 115TLRZ
    • 2000: 115TLRY, C115TLRY
    • 1999-1997: 115TLRX, S115TLRX, C115TLRX, 115TLRW, S115TLRW, C115TLRW, 115TLRV, S115TLRV, P115TLRV, C115TLRV
    • 1996-1991: 115TLRU, C115TLRU, P115TLRU, S115TLRU, 115TLRT, C115TLRT, P115TLRT, 115TLRS, C115TLRS, P115TLRS, 115TLRR, C115TLRR, P115TLRR, 115TLRQ, C115TLRQ, 115TLRP, C115TLRP
  • 130TLR Series:
    • 2004: 130TLRC
    • 2003: 130TLRB
    • 2002: 130TLRA
    • 2001: 130TLRZ
    • 2000: 130TLRY
    • 1999-1996: 130TLRX, S130TLRX, 130TLRW, S130TLRW, 130TRLV, S130TLRV, 130TLRU, S130TLRU
    • 1995-1991: 130TRLT, 130TLRS, 130TLRR, 130TLRQ, 130TLRP
  • 115/130ETL Series:
    • 1990: 115ETLD, 130ETLD
    • 1989: 115ETLF, 130ETLF
    • 1988: 115ETLG, 130ETLG
    • 1987: 115ETLH, 130ETLH
    • 1986: 115ETLJ
    • 1985: 115ETLK
    • 1984: 115ETLN

90-405-A25 (2:1 Ratio / 25″ Shaft / 2-Stroke) replaces the following Yamaha V-4 Models:

  • Replaces the gear case on most Yamaha V-4 2-Stroke with 25-inch drive shaft.
  • 115TXR Series:
    • 2005: 115TXRD
    • 2004: 115TXRC
    • 2003: 115TXRB
    • 2002: 115TXRA
    • 2001: 115TXRZ
    • 2000: 115TXRY, C115TXRY
    • 1999-1997: 115TXRX, S115TXRX, C115TXRX, 115TXRW, S115TXRW, C115TXRW, 115TXRV, S115TXRV, C115TXRV
    • 1996-1991: 115TXRU, C115TXRU, S115TXRU, 115TXRT, C115TXRT, 115TXRS, C115TXRS, 115TXRR, C115TXRR, 115TXRQ, C115TXRQ, 115TXRP, C115TXRP
  • 130TXR Series:
    • 2004: 130TXRC
    • 2003: 130TXRB
    • 2002: 130TXRA
    • 2001: 130TXRZ
    • 2000: 130TXRY
    • 1999-1996: 130TXRX, S130TXRX, 130TXRW, S130TXRW, 130TXRV, S130TXRV, 130TXRU, S130TXRU
    • 1995-1991: 130TXRT, 130TXRS, 130TXRR, 130TXRQ, 130TXRP
  • 115/130ETX Series:
    • 1990: 115ETXD, 130ETXD
    • 1989: 115ETXF, 130ETXF
    • 1988: 115ETXG, 130ETXG
    • 1987: 115ETXH, 130ETXH
    • 1986: 115ETXJ
    • 1985: 115ETXK
    • 1984: 115ETXN

90-405-B20F (2.15:1 Ratio / 20″ Shaft / 4-Stroke) replaces the following Yamaha F115 Models:

  • (F115 115hp 4-Stroke Only 2000-2014 Standard Rotation)
  • F115TLR/LA Series:
    • 2014-2011: F115LA, F115TLR
    • 2010-2006: F115TLR
    • 2005: F115TLR, F115TLRD
    • 2004: F115TLRC
    • 2003: F115TLRB
    • 2002: F115TLRA
    • 2001: F115TLRZ
    • 2000: F115TLRY

90-405-B25F (2.15:1 Ratio / 25″ Shaft / 4-Stroke) replaces the following Yamaha F115 Models:

  • (F115 115hp Standard Rotation 2000-2014 only)
  • F115TXR/XA Series:
    • 2014-2011: F115XA, F115TXR
    • 2010-2006: F115TXR
    • 2005: F115TXR, F115TXRD
    • 2004: F115TXRC
    • 2003: F115TXRB
    • 2002: F115TXRA
    • 2001: F115TXRZ
    • 2000: F115TXRY
Additional information
Weight 65 lbs
Dimensions 37 × 10 × 61 in
Ratio/Shaft

2:1 Ratio / 20" Shaft / 2 Stroke / RH Rotation

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2:1 Ratio / 25" Shaft / 2 Stroke / RH Rotation

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2.15:1 Ratio / 20" Shaft / 4 Stroke / RH Rotation

,

2.15:1 Ratio / 25" Shaft / 4 Stroke / RH Rotation

Brand

Brand

SEI

Reviews (28)
4.2
28 reviews
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28 reviews for SEI 90-405 – Aftermarket Lower Unit – Replacement for Yamaha Outboard 115–130HP 4 Stroke – Fits 20″ & 25″ Shafts

Clear filters
  1. Jerry Reynolds

    All-season reliability—versatile pick!

  2. Amanda Davis

    The splines slid into place with zero hassle. After a month, the unit shows no wear and performs like new. A flawless, budget-friendly replacement!

  3. John Stevens

    The splines fit snugly—no play or vibration. After 30 hours, the unit runs silently and cool. A flawless replacement for half the OEM cost!

  4. Donna Kelly

    I’ve used this for six fishing trips now, including rough offshore conditions. It handles sudden throttle changes without hesitation, and there’s no play in the prop shaft. Feels like a factory part!

  5. Travis Turner

    Followed the manual—done in 20 minutes. No complaints!

  6. Lori Rodriguez

    Excel in tournaments and leisure. Unbeatable value!

  7. Karen Thompson

    No special tools needed. Done in a coffee break!

  8. Todd Richardson

    Quick support—durable choice!

  9. Erik Hampton

    No leaks—trusty upgrade!

  10. Robert Reid

    Instant joy—buy now!

  11. Michael Watson

    24/7 support and a leak-proof guarantee—stellar combo. The unit arrived early, runs quiet, and handles hurricane swells. A standout in aftermarket parts!

  12. Ariel Woods

    Eco-packaging—heavy loads conquered!

  13. Julie Thomas

    This unit arrived with a protective film on the housing—nice touch. Installation took 40 minutes, and performance is whisper-quiet. Worth every penny for peace of mind!

  14. Laurie Oneal

    The pre-greased fittings saved me time during installation. After 25 hours of runtime, the unit performs like new. A must-buy for practical boaters!

  15. Thomas Carson

    The unit arrived with a handwritten thank-you card. Installed it in 25 minutes, and performance is flawless. OEM quality without the markup—zero buyer’s remorse!

  16. Scott Patrick

    Not a single leak. Performs like it’s brand new.

  17. Kristina Gomez

    Tested this in saltwater estuaries for weeks—zero rust on the stainless steel components. Shifts are crisp, the oil stays clean, and the price beats OEM by half. A saltwater angler’s dream!

  18. Julie Webb

    Matched my engine perfectly. Installation was a cakewalk!

  19. Albert Pittman

    Thank-you card—classy touch. Flawless performance!

  20. Cindy Baird

    The splines aligned perfectly—no adjustments needed. After two months, the unit runs cooler and quieter than my OEM part. A budget-friendly gem with premium performance!

  21. David Chandler

    Thick housing—tough love!

  22. Roger Hunter

    The anti-corrosion coating is military-grade. After saltwater immersion, it looks pristine. Shifts are silent, the price is fair, and delivery was overnight. A saltwater boater’s best friend!

  23. Kyle Black

    No downtime—quick swap!

  24. Daniel Woodward

    After months of hesitation, I finally replaced my old unit with this model. The installation took 40 minutes with basic tools, and it’s been leak-free through 20+ fishing trips. Smooth shifts and no corrosion—worth every penny!

  25. Marc Thomas

    No guesswork—clear labels and diagrams. Works like OEM!

  26. Steven Lee

    Eco-friendly packaging impressed me. The unit handles heavy loads effortlessly—no complaints after 60 days. A green choice for eco-conscious boaters!

  27. Ryan Deleon

    After a flawed Amazon unit, this saved my season. Crisp shifts, bone-dry seals, stellar service. Finally, a company that cares about boaters!

  28. Jennifer Brown

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

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