Jo was born and raised in Suzuka, Japan to parents Yoichi and Ai.

Jo continued to ride through childhood and his parents entered him in many local races.

His father then sought stiffer competition for Jo and had him race in Europe and the United States.

The next year he signed with the Honda Factory Connection's amateur program.

Jo again raced the 250SX East, placing within the top 5 for most of season and earning his first win.

He finished 2nd Overall On Wednesday October 18, Shimoda announced his move from Pro Circuit Kawasaki to HRC Honda.

Jo started his 250SX West season with some misfortunes but mostly stayed within the top 5.