Nickname: Harukidoke
Race number: 386
Date of birth: 21/10/1998
Hometown/state: Saitama, Japan
ProMX class: MX2
ProMX debut: 2018
Career highlights: Two-time Japanese MX2 champion, twice represented Japan in the Motocross of Nations
Make and model of 2026 motorcycle: Kawasaki KX250
Sponsors: Kawasaki Australia, Dunlop, Showa, Rival INK, Thor, Rock Oil, Akrapovic, Arai Helmets
First motorcycle: Yamaha PW50 
Race preparation: Run
Social media handle: Instagram: @harukiyokoyama386