2019 Yamaha 8 HP F8SMHB is twin-cylinder F8 still offers the benefits of fuel efficiency, quiet running and light weight, while getting a host of new ergonomic improvements and a new look. Best of all, displacement is now up 7.5 per cent for more torque and thrust. The new twin-cylinder F8 still offers the benefits of fuel efficiency, quiet running and light weight, while getting a host of new ergonomic improvements and a new look. Best of all, displacement is now up 7.5 per cent for more torque and thrust.