January 23rd, 1905

Dürkopp four-cylinder Bicycle Engine appeared in The Motor Cycle for January 23rd, 1905.
Dürkopp

    January 23rd 1966

Evel Knievel and his Motorcycle Daredevils debut at the National Date Festival in Indio, California. Evel jumps two small trucks trucks parked back-to-back (an estimated 45 feet) riding a Norton Atlas. The show was a huge success.
Motorcycle Daredevils

    January 23rd, 1970

Evel Knievel jumps 9 cars and 2 vans at the Cow Palace in Daly City, California.
Knievel was not a fan of the one-percenters, and said words along the lines of "Hells Angels are a stain on the reputation of motorcyclists everywhere." One of them took umbrage and hurled something at him - a bottle or a tyre iron - and a huge brawl broke out between the gang members and the fans. Just a month earlier the Angels beat a man to death at a Rolling Stones concert in Altamont.
Malice at the Cow Palace