A 4-cylinder engine has the highest power-to-pounds ratio of all bike engines and also has the lowest vibrations and best balance mainly because of the very quick firing intervals. You can find different configurations of four-cylinder engines according to the angle in between the cylinders: The overhead valve is utilized, https://dirtbikeengines58257.vblogetin.com/40829445/bike-engine-comparison-no-further-a-mystery