Johnston was part of BBC Sport NI’s coverage of the North West 200 in 2024 and the Fermanagh rider is set be to involved again in May.
He adds that doing punditry prepares him for “a life after racing” and it was a “hard” decision to focus on short-circuit racing.
“It’s something I have loved for a long time,” added Johnston on riding on the roads.
“I was hard. I have two or three people quite close to me and I regard their thoughts as important.
“We weighed up the pros and cons, but you have to be going for the right reason.”
After announcing he will sit out road racing, Johnston says his immediate aim is to win races in the British Supersport Championship.
“I want to get back to winning races. Before the crash I was doing that and that’s what I want to do.
“The main aim is to win races and then see where we are in the championship towards the end of the year.”
