直列4気筒
Inline-four engines are also used in MotoGP by the Suzuki (since 2015) and Yamaha (since 2002) teams. In 2010, when the four-stroke Moto2 class was introduced, the engines for the class were a inline-four engine made by Honda based on the CBR600RR with a maximum power output of . Starting in 2019, the engines were replaced by a Triumph triple engine.