SEI Yamaha 150 HP Four-Stroke Lower Unit 2.00:1 25″ Short Shift ShaftThese SEI aftermarket replacement lower units fit select Yamaha 150 HP four-stroke outboards. Both versions feature a 2.00:1 gear ratio, 25-inch driveshaft configuration, and short shift shaft. Choose the SE416 standard-rotation version for compatible F150 and VF150 applications or the SE418 counter-rotation version for compatible LF150 applications. Both are supplied in black and can be painted to match your engine.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.Features2.00:1 gear ratio25-inch driveshaft configurationShort shift shaftStandard-rotation and counter-rotation optionsBlack finish; paint to match your engine if desiredAvailable ApplicationsStandard Rotation SE416 / 90-416-B25FS: For select Yamaha F150 and VF150 four-stroke applications.Counter Rotation SE418 / 90-418-B25FS: For select Yamaha LF150 four-stroke applications.Standard-Rotation Model ReferencesF150XCA: Listed 20172024 applicationsF150XCA2: Listed 20212024 applicationsF150XSA4: Listed 20232024 applicationsVF150XA: Listed 20152024 applicationsVF150XB: Listed 2024 applicationCounter-Rotation Model ReferencesLF150XCA: Listed 20172022 applicationsLF150XCA2: Listed 20212022 applicationsFitment and OrderingSelect the rotation that matches your engine and existing lower unit. Confirm your full engine model number, serial number, gear ratio, driveshaft length, and short shift shaft configuration against SEI’s application guide before ordering. Horsepower and shaft length alone do not confirm compatibility.