Yamaha XF450USA4 Outboard Motor. 30-Inch Shaft 5.6-Liter V8 Digital Electronic Control Electronic Fuel Injection Electric Start Power Trim and Tilt Classic White. The Yamaha XF450USA4 is the 30-inch shaft, Classic White version of Yamaha's most powerful offshore outboard. Delivering 450 horsepower from a commanding 5.6-liter V8, this model is built for larger offshore vessels that require extended shaft length and unmatched durability. With a refined Classic White finish, this outboard enhances