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90-423-B30F - SE423 Lower Unit Yamaha V-6, 4.2L 4-Stroke, 1.75 to 1, 30 inch Standard Rotation

SEI Marine 90-423-B30F - SE423 Lower Unit Yamaha V-6, 4.2L 4-Stroke, 1.75 to 1, 30 inch Standard RotationSEI Marine 90-423-B30F - SE423 Lower Unit Yamaha V-6, 4.2L 4-Stroke, 1.75 to 1, 30 inch Standard Rotation

List Price
$1865.00

Your Price
$1,645.00
You save $220.00

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SECURE CHECKOUT
SPEEDY DELIVERY
30-DAY RETURN
FULL WARRANTY

Part Number
90-423-B30F

Manufacturer
SEI Marine

Replaces some 2010 to current 30 inch F250 and F300 models

4.2L V-6, 1.75 to 1 ratio
Does not fit engines that were built with two-piece driveshafts.
Does not fit engines that have the TERE (Thrust Enhancing Reverse Exhaust) feature.

Replaces OEM part numbers:
6CE-45300-11-8D
6CE-45300-12-8D
6CE-45300-13-8D
6CE-45300-14-8D
6CE-45300-15-8D 
Year Model Number Shaft Gear Ratio
2021 F250UCA 30 1.75:1
2021 F300UCA 30 1.75:1
2020 F300UCA 30 1.75:1
2019 F250UCA 30 1.75:1
2019 F300UCA 30 1.75:1
2018 F250UCA 30 1.75:1
2018 F300UCA 30 1.75:1
2017 F250UCA 30 1.75:1
2017 F300UCA 30 1.75:1
2016 F250UCA 30 1.75:1
2016 F300UCA 30 1.75:1
2016 F300BETU 30 1.75:1
2015 F250UCA 30 1.75:1
2015 F300UCA 30 1.75:1
2014 F250UCA 30 1.75:1
2014 F300UCA 30 1.75:1


Warranty (PDF)
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SEI Marine 90-423-b30f - Se423 Lower Unit Yamaha V-6, 4.2l 4-stroke, 1.75 To 1, 30 Inch Standard Rotation is equivalent to parts:

  • 6CE-45300-15-8D Yamaha Marine
  • 6CE-45300-14-8D Yamaha Marine
  • 6CE-45300-13-8D Yamaha Marine
  • 6CE-45300-12-8D Yamaha Marine
  • 6CE-45300-11-8D Yamaha Marine
SEI Gearcases & Complete Outdrives
SEI Complete Trim & Tilt Units
SEI is the largest manufacturer of aftermarket sterndrives and outboard lower units in the world. Every SEI complete gearcase and outdrive carries a 3-Year No-Fault Warranty. SEI also manufactures complete tilt and trim uints as well as shafting and other individual parts. Their subsidiary company API Marine manfuactures a quality line of aftermarket outboard starter and trim motors.

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