 He was a regular in his home series in 1996, and in the British championship for the next 2 years, coming 4th overall in 1999, before moving on to the Supersport World Championship.He was 5th overall in , 7th in , 14th in and 4th in , before taking the crown as the lead rider for Ten Kate Honda, with 7 wins and 8 poles.Ten Kate expanded its Superbike World Championship team to 2 Honda Fireblade bikes for 2005, and Karl was moved up to join Chris Vermeulen, who won the WSS title for Ten Kate in and challenged for the WSBK crown as a series rookie in .