Evetts won the title last December and will hope for further success after cementing his future with his long term manufacturer.
“It’s a huge boost to sign on the dotted line again with Unicorn," said Evetts.
“Everyone at Unicorn has been behind me 100 per cent all the way during my journey, through the highs and lows.
“For Unicorn and the entire team to show so much faith in me gives me the belief to achieve big things.
“Hopefully winning the World Youth Championship is just the springboard to a really successful career.”