The F225 combines the 4-stroke's clean, quiet, fuel-efficient attributes with the unmitigated muscle of a V6. It's exceedingly lightweight, compact, and smooth-running, and was specifically engineered to meet the demands of today's torque-hungry V6-powered boats. The 24-valve double overhead cam delivers 225 high-end horses, yet it's remarkably stingy with your fuel. Yamaha's unique labyrinth exhaust design makes it so quiet at idling and trolling speeds that you might forget it's running. And it burns so clean that it exceeds emission standards and carries a CARB three-star rating for ultra low emissions. A lean, mean, clean machine.