SEI SE418 Yamaha Counter-Rotating Lower Unit – 25" Shaft

SEI SE418 Yamaha Counter-Rotating Lower Unit – 25" Shaft

The SEI SE418 is an aftermarket counter-rotating replacement lower unit for select Yamaha four-stroke outboards. Both versions have a 25" driveshaft and left-hand rotation for compatible port-side applications. Choose the engine application and gear ratio that match your existing lower unit.

This item is subject to a 20% restocking fee.

Year, serial number, and horsepower are required to process your order. Please contact us with this information after placing your order. Processing will be delayed until this information is received.

Available Applications

• F175/F200 – 1.86:1: SEI 90-418-A25F fits select Yamaha inline four-cylinder, four-stroke 175 and 200 HP counter-rotating models. OEM reference: 6DB-45300-14-8D.
• F150 – 2.00:1: SEI 90-418-B25F fits select Yamaha four-stroke 150 HP counter-rotating models. OEM reference: 64P-45300-12-8D.

Features

• Counter rotation (left-hand rotation)
• 25" driveshaft on both versions
• Black finish that can be painted to match your engine

Fitment and Ordering

Compatibility depends on the exact engine model, year, rotation, and gear ratio. These versions are intended for select Yamaha LF150, LF175, and LF200 applications. Horsepower alone does not confirm fitment.

Please provide the full engine model number from the identification tag along with your year, serial number, and horsepower so the correct application can be verified.

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