SEI SE422 Lower Unit for Yamaha F225 & F250 Standard Rotation, 2.00:1The SEI SE422 is an aftermarket replacement lower unit for select Yamaha F225 and F250 outboards. Featuring a 2.00:1 gear ratio and water-cooled bearing carrier, these units are designed for standard-rotation applications. Each unit comes 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.Features Aftermarket replacement lower unit from SEI Marine; For select Yamaha F225 and F250 applications; Standard rotation; 2.00:1 gear ratio; Water-cooled bearing carrier; Black finish that can be painted to match; Engine Application and Shaft Length F225 / 20": SEI 90-422-B20F; replaces OE part number 6BB-45300-00-8D; F250 / 25": SEI 90-422-B25F; replaces OE part number 6P2-45300-41-8D; F250 / 30": SEI 90-422-B30F; replaces OE part number 6P2-45300-50-8D; Fitment RequirementsSelect the option that matches both your engine application and shaft-length designation. Confirm your full Yamaha engine model number against SEI's application guide, along with the engine year, serial number, existing gear ratio, and OE lower-unit number.For standard-rotation applications only. Horsepower and shaft length alone do not establish compatibility.