The Yamaha V6 Offshore outboards, in the form of the F225, F250, and F300 engines, are topped in the line only by the Yamaha F350 V8 powerplant. But the F350 has been around for over a decade. And through that decade many tweaks and improvements have been made. The result? The Yamaha F350C, with the “C” indicating that this isn’t yesteryear’s outboard engine.