Yamaha F250-F350 4.2L Lower Unit | 90-423 | 25" 30" Shaft
Yamaha F250-F350 4.2L Lower Unit | 90-423 | 25" 30" Shaft
Yamaha F250-F350 4.2L Lower Unit | 90-423 | 25" 30" Shaft
Yamaha F250-F350 4.2L Lower Unit | 90-423 | 25" 30" Shaft

Yamaha F250-F350 4.2L Lower Unit | 90-423 | 25" 30" Shaft

$1,645.00
$1,899.00
$1,645.00
(-13%)
SKU: SE90-423-A25F
Please hurry! Only 200 left in stock
Subtotal: $1,645.00
Yamaha F250-F350 4.2L Lower Unit | 90-423 | 25" 30" Shaft

Yamaha F250-F350 4.2L Lower Unit | 90-423 | 25" 30" Shaft

$1,899.00 $1,645.00
Yamaha F250-F350 4.2L Lower Unit | 90-423 | 25" 30" Shaft
Yamaha F250-F350 4.2L Lower Unit | 90-423 | 25" 30" Shaft
Yamaha F250-F350 4.2L Lower Unit | 90-423 | 25" 30" Shaft
Yamaha F250-F350 4.2L Lower Unit | 90-423 | 25" 30" Shaft

Yamaha F250-F350 4.2L Lower Unit | 90-423 | 25" 30" Shaft

$1,899.00 $1,645.00
Liter/Shaft/Motor: 4.2L / 25" / 4 Stroke

    Power your offshore adventures with this Premium Aftermarket Replacement gearcase, specifically engineered for high-displacement Yamaha 4.2L V6 engines. This unit is the ultimate solution for owners of F250, F300, and F350 models looking for OEM-level performance without the factory price tag.

    • High-Displacement Ready: Built to handle the massive torque of 4.2L Yamaha engines, ensuring smooth power delivery and durability.

    • Superior Thermal Management: Features a water-cooled bearing carrier and dual-side water intakes for maximum cooling efficiency in demanding saltwater environments.

    • Professional Grade: Arrives fully assembled, pressure-tested, and pre-filled with premium gear lube for a true "bolt-on" installation.

    • Brand: SEI
    • Part Number: 90-423
    • Engine Compatibility: Yamaha F250-F350 (4.2L V6)
    • Horsepower Range: 250 - 350 HP
    • Gear Ratio: 2.00:1
    • Water Intake: Dual & Side (High-Flow)
    • Finish: Black (Repaintable to match OEM)
    • Warranty: 3-Year Fault-Free Warranty
    • Engine Type: Yamaha 4-Stroke F250, F300, & F350 (4.2L Models)
    • Rotation: Standard (Right-Hand)
    • Gear Ratio: 2.00:1
    • Shaft Lengths: 25" (XL) and 30" (XXL)
    • 4.2L Displacement Only: This unit is strictly for the 4.2L displacement series. It will not fit the older 3.3L models.
    • Shaft Length Check: Always verify your required Shaft Length (25" or 30") before ordering, as incorrect fitment is the primary cause of returns.

    Mariners Warehouse vs Others

    Built to match OEM standards while delivering reliable performance and peace of mind.

    Features

    Mariners Warehouse

    Others
    Performance ✔️ ❌
    Warranty Support Reliable warranty Limited or unclear warranty terms
    Customer Trust Trusted by thousands of marine customers Unverified buyer trust
    Pre-tested before shipping for reliability ✔️ ❌
    OEM performance standards ✔️ ❌
    Simple return process ✔️ ❌

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