[1][2] Born in Odense, Denmark, Larsen began his British speedway career in 2008 with Newcastle Diamonds, the first of three seasons that he rode for the club.
[3] He capped of a superb season by winning the Premier League Riders Championship, held on 26 September at Owlerton Stadium.
[4] In 2011, he moved up to the Elite League with Coventry Bees, staying with them in 2012 and captaining the team at Birmingham, a season in which he finished third in the team's averages.
[6] He has also raced in Denmark for Vojens and Outrup and also in Poland and Sweden.
[7] On 19 April 2016, Larsen was hospitalised and put into an induced coma after having a pellet removed from his brain following an apparent accident with an air gun.