Cameron Donald has left the Honda TT Legends Endurance World Championship team for 'personal reasons'.
The Australian rider, who has been a part of the team since its formation in 2011, wishes to spend more time with his family in his home country.
Donald will still compete at the North West 200 and Isle of Man TT for Northern Ireland team Wilson Craig Racing on Honda machinery.
He said: “This was not an easy decision for me and I will miss the team hugely.
“We've had some great times over the past two years and the experience of endurance racing is one I'll never forget, but at the end of the day, it doesn't suit me to be away from Australia for such a long period of time.
“I'd like to thank Honda and the team for the opportunity.”
The remaining Honda TT Legends Endurance World Championship riders, John McGuinness, Simon Andrews and Michael Rutter, will form a three-man team to contest the four-round series, which commences with the Bol d'Or 24-hour event on April 20/21.
The line-up for the North West 200 and TT remains the same, with Michael Dunlop joining McGuinness and Rutter for the Superbike races.
Team manager, Neil Tuxworth, said: “We're very disappointed that Cameron will not be a part of the EWC team this year as he has done an excellent job over the past two years.
“He expressed a wish to spend more time at home in Australia, which meant he was unable to commit to the programme of testing and racing required and therefore we have mutually agreed for him to stand down.
“We wish him all the best for the NW200 and TT and look forward to seeing him at those events.”