Suzuki Lower Unit SE521 – Replaces DF200/225/250TX/TXX 2004–Current – 25″ & 30″ Shaft image 0
Suzuki Lower Unit SE521 – Replaces DF200/225/250TX/TXX 2004–Current – 25″ & 30″ Shaft image 1
Suzuki Lower Unit SE521 – Replaces DF200/225/250TX/TXX 2004–Current – 25″ & 30″ Shaft image 2
Suzuki Lower Unit SE521 – Replaces DF200/225/250TX/TXX 2004–Current – 25″ & 30″ Shaft image 3
Suzuki Lower Unit SE521 – Replaces DF200/225/250TX/TXX 2004–Current – 25″ & 30″ Shaft image 4
Suzuki Lower Unit SE521 – Replaces DF200/225/250TX/TXX 2004–Current – 25″ & 30″ Shaft image 0
Suzuki Lower Unit SE521 – Replaces DF200/225/250TX/TXX 2004–Current – 25″ & 30″ Shaft image 1
Suzuki Lower Unit SE521 – Replaces DF200/225/250TX/TXX 2004–Current – 25″ & 30″ Shaft image 2
Suzuki Lower Unit SE521 – Replaces DF200/225/250TX/TXX 2004–Current – 25″ & 30″ Shaft image 3
Suzuki Lower Unit SE521 – Replaces DF200/225/250TX/TXX 2004–Current – 25″ & 30″ Shaft image 4

Suzuki Lower Unit Replacement | SE521 | DF200/225/250 25" & 30" Shaft

$1,695.00
$1,825.95
$1,695.00
(-7%)
Please hurry! Only 96 left in stock
Subtotal: $1,695.00
Suzuki Lower Unit SE521 – Replaces DF200/225/250TX/TXX 2004–Current – 25″ & 30″ Shaft image 0

Suzuki Lower Unit Replacement | SE521 | DF200/225/250 25" & 30" Shaft

$1,825.95 $1,695.00
Suzuki Lower Unit SE521 – Replaces DF200/225/250TX/TXX 2004–Current – 25″ & 30″ Shaft image 0
Suzuki Lower Unit SE521 – Replaces DF200/225/250TX/TXX 2004–Current – 25″ & 30″ Shaft image 1
Suzuki Lower Unit SE521 – Replaces DF200/225/250TX/TXX 2004–Current – 25″ & 30″ Shaft image 2
Suzuki Lower Unit SE521 – Replaces DF200/225/250TX/TXX 2004–Current – 25″ & 30″ Shaft image 3
Suzuki Lower Unit SE521 – Replaces DF200/225/250TX/TXX 2004–Current – 25″ & 30″ Shaft image 4

Suzuki Lower Unit Replacement | SE521 | DF200/225/250 25" & 30" Shaft

$1,825.95 $1,695.00
Engine/Ratio/Driveshaft:: 3.6L/2.29/25

    Stop settling for a compromised day on the water due to a failed gearcase. This Premium Aftermarket Replacement for Suzuki outboards provides a Heavy-Duty solution for high-horsepower engines, ensuring your vessel returns to peak performance with a Standard Rotation configuration. Engineered for durability, this unit comes in a sleek black finish that can be custom-painted to match your specific engine aesthetics.

    • Reliable Power Delivery: Designed specifically for Suzuki 3.36L engines.

    • Offshore Ready: Built to handle the torque and demands of 200HP to 250HP outboards.

    • Versatile Fitment: Compatible with both 25-inch (TX) and 30-inch (TXX) transoms.



    • Brand: SEI
    • Part Number: SE521 (90-521-B25F / 90-521-B30F)
    • Cross-Reference: Suzuki DF200, DF225, DF250
    • Engine Displacement: 3.36 Liters
    • Gear Ratio: 2.29:1
    • Shaft Length: Available in 25" and 30"
    • Rotation: Standard (Right Hand)
    • Year Range: 2004 – 2023+

    This lower unit fits the following Suzuki 4-Stroke models (2004–Current):

    • DF200: TX, TXW, TL, TXK4-K10 models.
    • DF225: TX, TXW, TXX, TXXK4-K10 models.
    • DF250: TX, TXW, TXX, TXXK4-K10 models.
    • Standard Rotation Only: This unit is NOT a replacement for Counter-Rotation (Left Hand) models.
    • AP Series Exclusion: Does NOT replace Suzuki "AP" (Selective Rotation/Precision Control) models.
    • Shaft Verification: Please confirm if you require the 25" L-Model or 30" XL-Model prior to purchase to avoid return shipping costs.

    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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