Suzuki SE528 counter-rotation lower unit side view
SEI SE528 2.29 ratio counter-rotation lower unit
SE528 90-528-B25F 25-inch Suzuki replacement gearcase
SE528 90-528-B30F 30-inch counter-rotation gearcase
SEI SE528 2.29 ratio counter-rotation lower unit
Suzuki SE528 counter-rotation lower unit side view
SEI SE528 2.29 ratio counter-rotation lower unit
SE528 90-528-B25F 25-inch Suzuki replacement gearcase
SE528 90-528-B30F 30-inch counter-rotation gearcase
SEI SE528 2.29 ratio counter-rotation lower unit

Suzuki SE528 Counter-Rotation Lower Unit for DF200, DF225 & DF250

$1,895.00
$2,070.15
$1,895.00
SKU: 90-528-B25F
Product type: Lower Unit
Please hurry! Only 98 left in stock
Subtotal: $1,895.00

Required for fitment review to confirm compatibility.

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Suzuki SE528 counter-rotation lower unit side view

Suzuki SE528 Counter-Rotation Lower Unit for DF200, DF225 & DF250

$2,070.15 $1,895.00
Suzuki SE528 counter-rotation lower unit side view
SEI SE528 2.29 ratio counter-rotation lower unit
SE528 90-528-B25F 25-inch Suzuki replacement gearcase
SE528 90-528-B30F 30-inch counter-rotation gearcase
SEI SE528 2.29 ratio counter-rotation lower unit

Suzuki SE528 Counter-Rotation Lower Unit for DF200, DF225 & DF250

$2,070.15 $1,895.00
Choose Your SE528 Configuration: 3.6L / 2.29:1 / 25-inch – 90-528-B25F

    The Suzuki SE528 counter-rotation lower unit is a new aftermarket replacement gearcase manufactured by SEI for selected Suzuki DF200, DF225 and DF250 3.6L V6 outboards requiring counter or left-hand rotation.

    Available configurations include a 25-inch driveshaft under SKU 90-528-B25F and a 30-inch driveshaft under SKU 90-528-B30F. Both SE528 configurations use a 2.29:1 overall ratio with a 12/22 gear-tooth combination.

    The SE528 is intended for verified ZX and ZXX counter-rotation applications. It does not replace standard/right-hand or Suzuki AP-model gearcases.

    Fitment cannot be confirmed using horsepower or engine position alone. Before ordering, provide the complete Suzuki engine model, serial number, model year, required rotation and shaft length.

    Quick Fitment Summary

    Specification Suzuki SE528 Counter-Rotation Lower Unit for DF200, DF225 & DF250
    Product New aftermarket replacement gearcase
    Manufacturer SEI
    Engine family Selected Suzuki 3.6L V6 four-strokes
    Models Selected DF200, DF225 and DF250
    Rotation Counter/left-hand only
    Overall ratio 2.29:1
    Gear teeth 12/22
    Shaft options 25-inch and 30-inch
    Model designations Verified ZX/ZXX applications
    DF200 years 2004–2014
    DF225/DF250 years Selected 2004–current
    Exclusion Does not replace AP models
    25-inch SKU 90-528-B25F
    30-inch SKU 90-528-B30F

    Is the Suzuki SE528 the Correct Lower Unit?

    The Suzuki SE528 counter-rotation lower unit is designed for selected DF200, DF225 and DF250 3.6L V6 outboards requiring counter or left-hand rotation. This aftermarket Suzuki replacement gearcase is available in verified 25-inch and 30-inch configurations and uses a 2.29:1 overall ratio with a 12/22 gear-tooth combination.

    The SE528 must not be confused with the standard-rotation SE521. Engine position alone does not reliably determine the required rotation, especially on twin- and multi-engine installations. Confirm the complete model designation, serial number and existing gearcase rotation.

    Customers searching for a Suzuki DF200, DF225 or DF250 counter-rotation lower unit must also verify the model year. SE528 support for DF200 is limited to selected 2004–2014 applications, while selected DF225 and DF250 applications continue beyond that range.

    Application / Compatibility Guide

    Use CTRL + F or search below to find your engine model

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    What Customers Say

    Exactly what I needed

    I needed a Suzuki counter-rotation lower unit for my twin-engine setup, and the SE528 was the right replacement after confirming my engine information. Fitment was straightforward, and everything has been running smoothly. Very pleased with the quality of the gearcase.
    John Anderson Verified buyer
    July 2026

    Great replacement for my DF250

    Ordered this Suzuki DF250 counter-rotation lower unit after damaging the original gearcase. I confirmed the model and shaft configuration before ordering, and the SE528 fit as expected. The boat is back on the water and running great.
    Daniel Miller Verified buyer
    June 2026

    Solid SE528 replacement

    The Suzuki SE528 lower unit has been a solid replacement for my counter-rotation setup. The unit arrived in good condition, and installation went smoothly once we verified the correct application. So far, I am very happy with its performance.
    William Carter Verified buyer
    May 2026

    Good fit for my DF225

    I was looking for a Suzuki DF225 counter-rotation lower unit and chose the SE528 after checking the engine model and shaft length. It matched my application well and has performed smoothly since installation. Definitely worth verifying your engine information before ordering.
    Matthew Johnson Verified buyer
    April 2026

    Back on the water

    Needed a Suzuki left-hand lower unit to replace a damaged gearcase in my multi-engine setup. The SE528 counter-rotation unit was the correct configuration after fitment was confirmed. Installation went well, and the boat is running properly again.
    Christopher Wilson Verified buyer
    March 2026

    Frequently Asked Questions

    Which Suzuki engines use the SE528 counter-rotation lower unit?
    The Suzuki SE528 lower unit is designed for select counter-rotation Suzuki DF200, DF225, and DF250 V6 outboards. Confirmed applications include select Suzuki DF200 counter-rotation applications from 2004–2014 and compatible DF225 and DF250 counter-rotation applications from 2004 onward. Always verify the complete engine model, model year, shaft configuration, and serial number before ordering to confirm compatibility.
    Is the Suzuki SE528 a left-hand counter-rotation gearcase?
    Yes. The Suzuki SE528 counter-rotation gearcase is a left-hand lower unit designed for compatible ZX and ZXX counter-rotation applications. It should only be used where the engine application specifically requires a counter-rotation replacement gearcase. Before ordering, verify your engine model, serial number, shaft configuration, and rotation requirement to ensure the SE528 is the correct replacement.
    Does the Suzuki SE528 fit DF200, DF225, and DF250 outboards?
    The Suzuki SE528 counter-rotation lower unit fits select DF200, DF225, and DF250 V6 counter-rotation applications, but it is not universal across every engine with these horsepower ratings. The DF200 counter-rotation application is limited to select 2004–2014 models, while confirmed DF225 and DF250 counter-rotation applications extend beyond that range. Verify the complete model designation, model year, shaft length, and serial number before purchase.
    Is the Suzuki SE528 lower unit new or remanufactured?
    The Suzuki SE528 lower unit is a new aftermarket replacement gearcase, not a remanufactured or refurbished OEM lower unit. It is intended as a replacement option for confirmed Suzuki counter-rotation applications requiring the SE528 gearcase. Before ordering, confirm that your engine requires a compatible SE528 configuration by checking the complete model number, serial number, shaft length, and rotation requirement.
    Is the Suzuki SE528 available for 25-inch and 30-inch applications?
    Yes. The Suzuki SE528 counter-rotation lower unit is available for confirmed 25-inch (ZX) and 30-inch (ZXX) applications. The correct shaft configuration should be matched to your complete Suzuki engine model rather than selected by horsepower alone. Before ordering, verify the engine model, serial number, shaft length, and required rotation to ensure the selected SE528 configuration matches your application.
    Can I use the Suzuki SE528 on a standard-rotation outboard?
    No. The Suzuki SE528 is a counter-rotation lower unit designed specifically for compatible left-hand and counter-rotation applications. It should not be used as a replacement for a standard-rotation gearcase. If your Suzuki outboard requires standard or right-hand rotation, verify the appropriate standard-rotation replacement instead. Always confirm the complete model number, serial number, shaft length, and rotation before ordering.
    How do I verify my Suzuki counter-rotation lower unit before ordering?
    Before ordering a Suzuki SE528 lower unit, verify the complete engine model, serial number, model year, counter-rotation requirement, and 25-inch or 30-inch shaft configuration. For twin- or multi-engine installations, also confirm which engine requires the counter-rotating gearcase rather than assuming the SE528 is automatically the correct port-engine lower unit. If you are unsure, provide the engine information to Mariners Warehouse for fitment verification before ordering.

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