Chris Adley has lost his life after an horrific crash at the two-day Kings of Wanneroo meeting at Barbagallo.
The 22-year-old had taken a fall before being struck by another rider.
It is the sixth motorcycle fatality at the Perth circuit in the last 16 years.
A statement on the Motorcycling WA website read: “Motorcycling Western Australia, along with the Motor Cycle Racing Club of WA extend our sincere condolences to his family and friends.”
A report into the weekend fatality is being prepared for the coroner.