He believed that he could design a better engine and did so , inventing his double sleeve principle in 1904 .
In 1901 Knight bought an air - cooled , single - cylinder three - wheeler whose noisy valves annoyed him .
Knight believed that Knight could design a better engine and did so , inventing Knight 's double sleeve principle in 1904 .
In 1901 Knight bought an air - cooled , single - cylinder three - wheeler whose noisy valves annoyed him .